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archived-presentations/tweakers.html
Rasmus Lerdorf 63b98b4e56 Center
2017-02-16 14:01:28 +01:00

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>PHP 7 in 2017</title>
<meta name="description" content="PHP 7 in 2017">
<meta name="author" content="Rasmus Lerdorf">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
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/*
Not actually sure why this block isn't being picked up from the syntax highlight css
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*/
.reveal pre {
width: 100%;
}
.reveal pre code {
display: block;
max-height: 600px;
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border: none;
}
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display: block;
overflow-x: auto;
padding: 0.5em;
background: #000;
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line-height: 125%;
-webkit-text-size-adjust: none;
}
/* Left-align h3 and h4 if they are p elements */
h3.p {
text-align: left;
}
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text-align: left;
}
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.reveal ul {
display: block;
margin: 0 0 1em 3em;
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<script src="/reveal.js/lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h1>PHP 7 in 2017</h1>
<h3>Developers Summit 2017</h3>
<h3>Utrecht</h3>
<h3>Feb.16, 2017</h3>
<a href="http://talks.php.net/tweakers">http://talks.php.net/tweakers</a><br><br>
<p>Rasmus Lerdorf<br>
<small><a href="http://twitter.com/@rasmus">@rasmus</a></small>
</p>
<aside class="notes">
</aside>
</section>
<section>
<section id="hist_80s">
<h1 style="text-align:center;text-transform:none">1980s</h1>
<img src="/presentations/slides/intro/vic20.jpg" align="center" width="" height="">
</section>
<section id="hist_80s_1">
<img src="/presentations/slides/intro/hayes.jpg" align="center" width="" height="">
</section>
<section id="hist_80s_2">
<img src="/presentations/slides/intro/Zmodem.gif" align="center" width="" height="">
</section> </section>
<section>
<section id="hist_90s">
<h1 style="text-align:center;text-transform:none">1990s</h1>
<img src="/presentations/slides/intro/gopher.gif" align="center" width="" height="">
</section>
<section id="hist_90s_1">
<img src="/presentations/slides/intro/mosaic.jpg" align="center" width="" height="">
</section> </section>
<section>
<section id="hist_1993">
<h3 class="p" style="text-align:center;">1993</h3>
<pre><code class="C" data-trim style="font-size:0.8em;" >#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;ctype.h&gt;
#include &lt;string.h&gt;
#define ishex(x) (((x) &gt;= '0' &amp;&amp; (x) &lt;= '9') || ((x) &gt;= 'a' &amp;&amp; \
(x) &lt;= 'f') || ((x) &gt;= 'A' &amp;&amp; (x) &lt;= 'F'))
int htoi(char *s) {
int value;
char c;
c = s[0];
if(isupper(c)) c = tolower(c);
value=(c &gt;= '0' &amp;&amp; c &lt;= '9' ? c - '0' : c - 'a' + 10) * 16;
c = s[1];
if(isupper(c)) c = tolower(c);
value += c &gt;= '0' &amp;&amp; c &lt;= '9' ? c - '0' : c - 'a' + 10;
return(value);
}
void main(int argc, char *argv[]) {
char *params, *data, *dest, *s, *tmp;
char *name, *age;
puts(&quot;Content-type: text/html\r\n&quot;);
puts(&quot;&lt;HTML&gt;&lt;HEAD&gt;&lt;TITLE&gt;Form Example&lt;/TITLE&gt;&lt;/HEAD&gt;&quot;);
puts(&quot;&lt;BODY&gt;&lt;H1&gt;My Example Form&lt;/H1&gt;&quot;);
puts(&quot;&lt;FORM action=\&quot;form.cgi\&quot; method=\&quot;GET\&quot;&gt;&quot;);
puts(&quot;Name: &lt;INPUT type=\&quot;text\&quot; name=\&quot;name\&quot;&gt;&quot;);
puts(&quot;Age: &lt;INPUT type=\&quot;text\&quot; name=\&quot;age\&quot;&gt;&quot;);
puts(&quot;&lt;BR&gt;&lt;INPUT type=\&quot;submit\&quot;&gt;&quot;);
puts(&quot;&lt;/FORM&gt;&quot;);
data = getenv(&quot;QUERY_STRING&quot;);
if(data &amp;&amp; *data) {
params = data; dest = data;
while(*data) {
if(*data=='+') *dest=' ';
else if(*data == '%' &amp;&amp; ishex(*(data+1))&amp;&amp;ishex(*(data+2))) {
*dest = (char) htoi(data + 1);
data+=2;
} else *dest = *data;
data++;
dest++;
}
*dest = '\0';
s = strtok(params,&quot;&amp;&quot;);
do {
tmp = strchr(s,'=');
if(tmp) {
*tmp = '\0';
if(!strcmp(s,&quot;name&quot;)) name = tmp+1;
else if(!strcmp(s,&quot;age&quot;)) age = tmp+1;
}
} while(s=strtok(NULL,&quot;&amp;&quot;));
printf(&quot;Hi %s, you are %s years old\n&quot;,name,age);
}
puts(&quot;&lt;/BODY&gt;&lt;/HTML&gt;&quot;);
}</code></pre>
</section> </section>
<section>
<section id="hist_1993_2">
<h3 class="p" style="text-align:center;">1993</h3>
<pre><code class="Perl" data-trim >use CGI qw(:standard);
print header;
print start_html('Form Example'),
h1('My Example Form'),
start_form,
&quot;Name: &quot;, textfield('name'),
p,
&quot;Age: &quot;, textfield('age'),
p,
submit,
end_form;
if(param()) {
print &quot;Hi &quot;,em(param('name')),
&quot;You are &quot;,em(param('age')),
&quot; years old&quot;;
}
print end_html;</code></pre>
</section> </section>
<section>
<section id="hist_1994">
<h3 class="p" style="text-align:center;">1994-1995</h3>
<pre><code class="PHP" data-trim >&lt;html&gt;&lt;head&gt;&lt;title&gt;Form Example&lt;/title&gt;&lt;/head&gt;
&lt;body&gt;&lt;h1&gt;My Example Form&lt;/h1&gt;
&lt;form action=&quot;form.phtml&quot; method=&quot;POST&quot;&gt;
Name: &lt;input type=&quot;text&quot; name=&quot;name&quot;&gt;
Age: &lt;input type=&quot;text&quot; name=&quot;age&quot;&gt;
&lt;br&gt;&lt;input type=&quot;submit&quot;&gt;
&lt;/form&gt;
&lt;?if($name):?&gt;
Hi &lt;?echo $name?&gt;, you are &lt;?echo $age?&gt; years old
&lt;?endif?&gt;
&lt;/body&gt;&lt;/html&gt;</code></pre>
</section> </section>
<section>
<section id="php7_speed">
<img src="/presentations/slides/intro/php7trans-200.png" width="" height="">
<p class="p" style="font-size:1.1em;text-align:left;">✔ engine improvements</p>
<ul>
<li style="font-size: 1em;">100%+ performance gain on most real-world applications</li>
<li style="font-size: 1em;">Lower memory usage, sometimes drastically lower</li>
</ul>
</section> </section>
<section>
<section id="php7perfdetail">
<h1 style="text-align:center;">JIT?</h1>
</section>
<section id="php7perfdetail1">
<p class="p" style="font-size:1.1em;">Improve CPU cache usage</p>
<ul>
<li style="font-size: 1em;list-style-type: none;">Step 1: Decrease overall data</li>
<li style="font-size: 1em;list-style-type: none;">Step 2: Better data locality and less indirections</li>
<li style="font-size: 1em;list-style-type: none;">Step 3: Save the world!</li>
</ul>
</section>
<section id="php7perfdetail1">
<ul>
<li style="font-size: 1em;list-style-type: none;">zval size reduced from 24 to 16 bytes</li>
<li style="font-size: 1em;list-style-type: none;">Hashtable size reduced from 72 to 56 bytes</li>
<li style="font-size: 1em;list-style-type: none;">Hashtable bucket size reduced from 72 to 32 bytes</li>
<li style="font-size: 1em;list-style-type: none;">Immutable array optimization</li>
</ul>
<pre><code data-trim style="font-size:1.1em;" >$a = [];
for($i=0; $i &lt; 100000;$i++) {
$a[] = ['abc','def','ghi','jkl','mno','pqr'];
}
echo memory_get_usage(true);
// PHP 5.x 109M
// PHP 7.0 42M no opcache
// PHP 7.0 6M with opcache enabled</code></pre>
</section>
<section id="php7perfdetail2">
<ul>
<li style="font-size: 1em;list-style-type: none;">New memory allocator similar to jemalloc</li>
<li style="font-size: 1em;list-style-type: none;">Faster hashtable iteration API</li>
<li style="font-size: 1em;list-style-type: none;">Array duplication optimization</li>
<li style="font-size: 1em;list-style-type: none;">PCRE JIT enabled by default</li>
<li style="font-size: 1em;list-style-type: none;">Precomputed string hashes</li>
<li style="font-size: 1em;list-style-type: none;">Fast ZPP (ZendParseParameters) implementation</li>
<li style="font-size: 1em;list-style-type: none;">Faster stack-allocated zvals (instead of heap)</li>
<li style="font-size: 1em;list-style-type: none;">Optimized VM calling</li>
<li style="font-size: 1em;list-style-type: none;">Global register variables with gcc 4.8+</li>
<li style="font-size: 1em;list-style-type: none;">plus hundreds of micro-optimizations</li>
</ul>
</section>
<section id="php7detail4">
<h1 style="text-align:center;">JIT?</h1>
</section> </section>
<section>
<section id="wpbench">
<div id="wpbench_container" class="stretch" style="margin: 0 auto"></div>
<script src="presentations/slides/intro/wp2017.js"></script>
</section>
<section id="fdo">
<p class="p" style="font-size:1.1em;text-align:center;">GCC Feedback-Directed Optimization (FDO)</p>
<pre><code class="shell nohighlight" data-trim style="font-size:1em;" >$ gcc --version
gcc (Debian 6.3.0-6) 6.3.0 20170205
$ make clean
$ make -j8 prof-gen
...
$ sapi/cgi/php-cgi -T 1000 /var/www/wordpress/index.php &gt; /dev/null
$ make prof-clean
$ make -j8 prof-use</code></pre>
</section> </section>
<section>
<section id="smemwp">
<div id="smemwp_container" class="stretch" style="margin: 0 auto"></div>
<script src="presentations/slides/intro/smemwp2017.js"></script>
</section> </section>
<section>
<section id="prod_perc95">
<h2 margin-bottom="2em">PHP 7 in production</h2><br>
<img src="/presentations/slides/intro/perc95.png" align="center" width="882" height="465">
</section>
<section id="prod_cpu">
<img src="/presentations/slides/intro/cpu.png" align="center" width="882" height="465">
</section>
<section id="prod_mem">
<img src="/presentations/slides/intro/mem.png" align="center" width="882" height="465">
</section> </section>
<section>
<section id="impact">
<h1 style="text-align:center;">Saving the Planet?</h1>
</section>
<section id="impact1">
<ul>
<li style="font-size: 1.5em;margin-left: -1em;">Around 2 billion sites on the web</li>
<li style="font-size: 1.5em;margin-left: -1em;">On 10 million physical machines</li>
<li style="font-size: 1.5em;margin-left: -1em;">PHP drives at least 50%</li>
</ul>
</section>
<section id="impact2">
<ul>
<li style="font-size: 1.5em;margin-left: -1em;">Currently ~5% PHP 7 Adoption</li>
<li style="font-size: 1.5em;margin-left: -1em;">which is about 250k physical servers</li>
</ul>
</section>
<section id="impact3">
<ul>
<li style="font-size: 1.5em;margin-left: -1em;">3000 KWH/year per server costs approx. US$400</li>
<li style="font-size: 1.5em;margin-left: -1em;">Data center cooling doubles that</li>
<li style="font-size: 1.5em;margin-left: -1em;">0.5kg CO2 per KWH</li>
</ul>
</section>
<section id="impact4">
<p class="p" style="font-size:2em;text-align:left;">At 5% Adoption</p>
<ul>
<li style="font-size: 1.5em;margin-left: -1em;">US $200M savings</li>
<li style="font-size: 1.5em;margin-left: -1em;">750M KWH Savings</li>
<li style="font-size: 1.5em;margin-left: -1em;">375M kg less CO2</li>
</ul>
</section>
<section id="impact5">
<p class="p" style="font-size:2em;text-align:left;">At 100% Adoption</p>
<ul>
<li style="font-size: 1.5em;margin-left: -1em;">$4B savings</li>
<li style="font-size: 1.5em;margin-left: -1em;">15B KWH Savings</li>
<li style="font-size: 1.5em;margin-left: -1em;">7.5B kg less CO2</li>
</ul>
</section>
<section id="impact6">
<h1 style="text-align:center;">Do your part</h1>
<h1 style="text-align:center;">Upgrade to PHP 7!</h1>
</section> </section>
<section>
<section id="php7">
<img src="/presentations/slides/intro/php7trans-200.png" width="" height="">
<p class="p" style="font-size:1.1em;text-align:left;">engine improvements</p>
<ul>
<li style="font-size: 1em;">100%+ performance gain on most real-world applications</li>
<li style="font-size: 1em;">Lower memory usage, sometimes drastically lower</li>
</ul>
</section>
<section id="php7excep">
<p class="p" style="font-size:1.1em;text-align:left;">Exceptions on Fatals</p>
<pre><code data-trim style="font-size:1.1em;" >function call_method($obj) {
$obj-&gt;method();
}
call_method(null);</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:0.85em;" >Fatal error: Uncaught Error: Call to a member function method() on null in file:2
Stack trace:
#0 file(4): call_method(NULL)
#1 {main}
thrown in file on line 2</code></pre>
<pre><code data-trim style="font-size:1.1em;" >try {
call_method(null);
} catch (Error $e) {
echo &quot;Caught Exception: {$e-&gt;getMessage()}\n&quot;;
}</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:0.85em;" >Caught Exception: Call to a member function method() on null</code></pre>
</section>
<section id="php7hier">
<p class="p" style="font-size:2em;text-align:center;">PHP 7 Exception Hierarchy</p>
<br/>
<ul>
<li style="font-size: 1.5em;list-style-type: none;"><font color="ab5c5c">Throwable</font></li>
<li style="font-size: 1.25em;margin-left: 2em;list-style-type: none;">➥ <font color="ab5c5c">Exception</font> implements Throwable</li>
<li style="font-size: 1.25em;margin-left: 2em;list-style-type: none;">➥ <font color="ab5c5c">Error</font> implements Throwable</li>
<li style="font-size: 1em;margin-left: 4em;list-style-type: none;">➥ <font color="ab5c5c">TypeError</font> extends Error</li>
<li style="font-size: 1em;margin-left: 4em;list-style-type: none;">➥ <font color="ab5c5c">ParseError</font> extends Error</li>
</ul>
</section>
<section id="php7ret">
<p class="p" style="font-size:1.1em;text-align:left;">Return Types</p>
<pre><code data-trim style="font-size:1.1em;" >function get_config(): array {
return 42;
}
get_config();</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:0.9em;" >Fatal error: Uncaught TypeError: Return value of get_config() must be
of the type array, integer returned in file:2
Stack trace:
#0 file(4): get_config()
#1 {main}
thrown in file on line 2</code></pre>
</section>
<section id="php7STH">
<p class="p" style="font-size:1.1em;text-align:left;">Coercive Scalar Types</p>
<pre><code data-trim style="font-size:1.1em;" >function logmsg(string $msg, int $level, float $severity) {
var_dump($msg); // string(1) &quot;1&quot;
var_dump($level); // int(2)
var_dump($severity); // float(3)
}
logmsg(1, &quot;2.5 bananas&quot;, 3);</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:0.9em;" >Notice: A non well formed numeric value encountered in file on line 2</code></pre>
<p class="p" style="font-size:1.1em;text-align:left;">Strict Scalar Types</p>
<pre><code data-trim style="font-size:1.1em;" >declare(strict_types=1);
...
logmsg(1, &quot;2.5&quot;, 3);</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:0.9em;" >Fatal error: Uncaught TypeError: Argument 1 passed to logmsg() must be of the
type string, integer given, called in file on line 7 and defined in file:3
Stack trace:
#0 file(7): logmsg(1, '2.5', 3)
#1 {main}
thrown in file on line 2</code></pre>
</section>
<section id="php7anon">
<p class="p" style="font-size:1.1em;text-align:left;">Anonymous Classes</p>
<pre><code data-trim style="font-size:1.2em;" >return new class($controller) implements Page {
public function __construct($controller) {
/* ... */
}
/* ... */
};
class MyObject extends MyStuff {
public function getInterface() {
return new class implements MyInterface {
/* ... */
};
}
}</code></pre>
</section>
<section id="php7coalesce">
<p class="p" style="font-size:1.1em;text-align:left;">Coalesce Operator</p>
<pre><code data-trim style="font-size:1.5em;" >$a = NULL;
$b = 0;
$c = 2;
echo $a ?? $b; // 0
echo $c ?? $b; // 2
echo $a ?? $b ?? $c; // 0
echo $a ?? $x ?? $c; // 2</code></pre>
</section>
<section id="Spaceship">
<p class="p" style="font-size:1.1em;text-align:left;">Spaceship Operator</p>
<img src="/presentations/slides/intro/lego-php-astronaut.png" width="230" height="345">
<pre><code data-trim style="font-size:1.1em;" >function cmp_php5($a, $b) {
return ($a &lt; $b) ? -1 : (($a &gt;$b) ? 1 : 0);
}
function cmp_php7($a, $b) {
return $a &lt;=&gt; $b;
}</code></pre>
</section>
<section id="php7cleanups">
<p class="p" style="font-size:1.1em;text-align:left;">Removal of many deprecated features<BR/>
     (Your PHP4 code will break!)</p>
<pre><code data-trim >- ext/ereg (use ext/pcre instead)
- preg_replace() eval modifier (use preg_replace_callback() instead)
- ext/mysql (use ext/mysqli or ext/pdo_mysql instead)
- Assignment of new by reference
- Scoped calls of non-static methods from incompatible $this context
- dl() in php-fpm
- set_magic_quotes_runtime() and magic_quotes_runtime()
- set_socket_blocking() (use stream_set_blocking() instead)
- mcrypt_generic_end() (use mcrypt_generic_deinit() instead)
- mcrypt_ecb, mcrypt_cbc, mcrypt_cfb and mcrypt_ofb
(use mcrypt_encrypt() and mcrypt_decrypt() instead)
- datefmt_set_timezone_id() and IntlDateFormatter::setTimeZoneID()
(use datefmt_set_timezone() or IntlDateFormatter::setTimeZone() instead)
- xsl.security_prefs (use XsltProcessor::setSecurityPrefs() instead)
- iconv.input_encoding, iconv.output_encoding, iconv.internal_encoding,
mbstring.http_input, mbstring.http_output and mbstring.internal_encoding
(use php.input_encoding, php.internal_encoding and php.output_encoding instead)
- $is_dst parameter of the mktime() and gmmktime() functions
- # style comments in ini files (use ; style comments instead)
- String category names in setlocale() (use LC_* constants instead)
- Unsafe curl file uploads (use CurlFile instead)
- PDO::PGSQL_ATTR_DISABLE_NATIVE_PREPARED_STATEMENT driver option
(use PDO::ATTR_EMULATE_PREPARES instead)
- CN_match and SNI_server_name stream context option (use peer_name instead)</code></pre>
</section>
<section id="php7reserved">
<p class="p" style="font-size:1.1em;text-align:left;">New reserved words:</p>
<ul>
<li style="font-size: 1em;list-style-type: none;">bool</li>
<li style="font-size: 1em;list-style-type: none;">int</li>
<li style="font-size: 1em;list-style-type: none;">float</li>
<li style="font-size: 1em;list-style-type: none;">string</li>
<li style="font-size: 1em;list-style-type: none;">null</li>
<li style="font-size: 1em;list-style-type: none;">false</li>
<li style="font-size: 1em;list-style-type: none;">true</li>
<li style="font-size: 1em;list-style-type: none;">resource</li>
<li style="font-size: 1em;list-style-type: none;">object</li>
<li style="font-size: 1em;list-style-type: none;">mixed</li>
<li style="font-size: 1em;list-style-type: none;">numeric</li>
</ul>
</section>
<section id="php7num">
<p class="p" style="font-size:1.1em;text-align:left;">64-bit integer support on Windows</p>
<p class="p" style="font-size:1.1em;text-align:left;">Cleanup edge-case integer overflow/underflow</p>
<p class="p" style="font-size:1.1em;text-align:left;">Support for strings with length >= 2^31 bytes in 64 bit builds.</p>
<p class="p" style="font-size:1.1em;text-align:left;">Parse error on invalid numeric literals</p>
<pre><code data-trim >$mask = 0855; // Parse error: Invalid numeric literal</code></pre>
</section>
<section id="php7UVS">
<p class="p" style="font-size:1.1em;text-align:left;">Uniform variable syntax</p>
<pre><code data-trim >// left-to-right
$this-&gt;$belongs_to['column']
// vs.
$this-&gt;{$belongs_to['column']}
// support missing combinations of operations
$foo()['bar']()
[$obj1, $obj2][0]-&gt;prop
getStr(){0}
// support nested ::
$foo['bar']::$baz
$foo::$bar::$baz
$foo-&gt;bar()::baz()
// support nested ()
foo()()
$foo-&gt;bar()()
Foo::bar()()
$foo()()
// support operations on arbitrary (...) expressions
(...)['foo']
(...)-&gt;foo
(...)-&gt;foo()
(...)::$foo
(...)::foo()
(...)()
// two more practical examples for the last point
(function() { ... })()
($obj-&gt;closure)()
// support all operations on dereferencable scalars
// (not very useful)
&quot;string&quot;-&gt;toLower()
[$obj, 'method']()
'Foo'::$bar</code></pre>
</section>
<section id="php7unicode">
<p class="p" style="font-size:1.1em;text-align:left;">Unicode Codepoint Escape Syntax</p>
<pre><code data-trim style="font-size:1.2em;" >echo &quot;\u{202E}Right-to-left text&quot;;
echo &quot; \u{26BD}&quot;;</code></pre>
<pre class="output" style="font-size:1.2em;">‮Right-to-left text ⚽ </pre> <p class="p" style="font-size:1.1em;text-align:left;">ICU IntlChar class added to intl extension</p>
</section>
<section id="php7csprng">
<p class="p" style="font-size:1.1em;text-align:left;">CSPRNG</p>
<pre><code data-trim style="font-size:1.2em;" >$int = random_int(-500, 500);
$bytes = random_bytes(10);
var_dump( $int );
var_dump( bin2hex($bytes) );</code></pre>
<pre class="output" style="font-size:1.2em;">int(414)
string(20) "f0491f72653eea697f0b"
</pre> </section> </section>
<section>
<section id="php71">
<h1 style="text-align:center;">PHP 7.1</h1>
</section>
<section id="php71_void">
<p class="p" style="font-size:1.1em;text-align:left;">void return type</p>
<pre><code data-trim style="font-size:1.1em;" >function should_return_nothing(): void {
return 1; // Fatal error: A void function must not return a value
}</code></pre>
</section>
<section id="php71_nullable">
<p class="p" style="font-size:1.1em;text-align:left;">Nullable types</p>
<pre><code data-trim style="font-size:1.1em;" >function answer(int $a, ?int $b): ?int {
if($a &gt; $b) return $a;
else return null;
}</code></pre>
</section>
<section id="php71iterable">
<p class="p" style="font-size:1.1em;text-align:left;">Iterable pseudo-type</p>
<pre><code data-trim style="font-size:1.1em;" >function foo(iterable $iterable) {
foreach ($iterable as $value) {
// ...
}
}
function bar(): iterable {
return [1, 2, 3];
}</code></pre>
</section>
<section id="php71neg">
<p class="p" style="font-size:1.1em;text-align:left;">Negative string offsets</p>
<pre><code data-trim style="font-size:1.1em;" >$str='abcdef';
var_dump($str[-2]); // =&gt; string(1) &quot;e&quot;</code></pre>
</section>
<section id="php71list">
<p class="p" style="font-size:1.1em;text-align:left;">List keys</p>
<pre><code data-trim style="font-size:1.1em;" >list($first, $second, $third) = [1, 2, 3];
[$first, $second, $third] = [1, 2, 3];</code></pre>
</section>
<section id="php71arith">
<p class="p" style="font-size:1.1em;text-align:left;">Warn about invalid strings in arithmetic</p>
<pre><code data-trim style="font-size:1.1em;" >$numberOfApples = &quot;10 apples&quot; + &quot;5 pears&quot;;</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:0.9em;" >Notice: A non well formed numeric string encountered in example.php on line 2
Notice: A non well formed numeric string encountered in example.php on line 2</code></pre>
</section>
<section id="php71classconst">
<p class="p" style="font-size:1.1em;text-align:left;">Class constant visibility</p>
<pre><code data-trim style="font-size:1.2em;" >class Token {
// Constants default to public
const PUBLIC_CONST = 0;
private const PRIVATE_CONST = 0;
protected const PROTECTED_CONST = 0;
public const PUBLIC_CONST_TWO = 0;</code></pre>
</section>
<section id="php71cleanups">
<p class="p" style="font-size:1.1em;text-align:left;">Things that may break your code</p>
<ul>
<li style="font-size: 0.8em;margin-left: -1em;">new 'void' and 'iterable' keywords</li>
<li style="font-size: 0.8em;margin-left: -1em;">rand() and srand() are now aliased to mt_rand() and mt_srand()</li>
<li style="font-size: 0.8em;margin-left: -1em;">Mersenne Twister algorithm has been tweaked</li>
<li style="font-size: 0.8em;margin-left: -1em;">Calling a function with too few args is now an Error instead of a Warning</li>
<li style="font-size: 0.8em;margin-left: -1em;">Dropped support for sslv2 streams</li>
<li style="font-size: 0.8em;margin-left: -1em;">Dropped support for mcrypt</li>
</ul>
</section> </section>
<section>
<section id="phan">
<h1 style="text-align:center;">Static Analysis</h1>
<br/>
<br/>
<div align="center" style="font-size: 2em; color: ; text-align: center; margin-left: ; margin-right: ; margin-top: ; margin-bottom: ;"><a href="https://github.com/etsy/phan" target="">github.com/etsy/phan</a></div>
</section>
<section id="phan1">
<p class="p" style="font-size:1.5em;text-align:left;">It can catch dumb mistakes</p>
<pre><code class="line-numbers" data-trim style="font-size:1em;" data-highlight-lines='2'>$a = [1,2,3];
if(count($a &gt; 1)) {
echo &quot;Test&quot;;
}</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:.75em;" >% phan test.php
test.php:2 PhanTypeComparisonFromArray array to int comparison</code></pre>
</section>
<section id="phan2">
<p class="p" style="font-size:1.5em;text-align:left;">Check phpdoc comments</p>
<pre><code class="line-numbers" data-trim style="font-size:.75em;" data-highlight-lines='10,11'>class C {
/** @var int $prop */
public $prop;
/**
* @param string $arg
* @return int
*/
function test($arg) {
$this-&gt;prop = $arg;
return $arg;
}
}</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:.75em;" >% phan test.php
test.php:10 PhanTypeMismatchProperty Assigning string to property but \C::prop is int
test.php:11 PhanTypeMismatchReturn Returning type string but test() is declared to return int</code></pre>
</section>
<section id="phan3">
<p class="p" style="font-size:1.5em;text-align:left;">Help with refactoring</p>
<pre><code class="line-numbers" data-trim style="font-size:1em;" data-highlight-lines='8'>class C {
/**
* @deprecated
*/
static function legacy_function() { }
}
C::legacy_function();</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:.65em;" >% phan test.php
test.php:8 PhanDeprecatedFunction Call to deprecated function \C::legacy_function() defined at test.php:5</code></pre>
</section>
<section id="phan4">
<p class="p" style="font-size:1.5em;text-align:left;">Install with composer</p>
<pre><code class="shell nohighlight" data-trim style="font-size:1em;" >$ composer require --dev etsy/phan</code></pre>
<p class="p" style="font-size:1.5em;text-align:left;">Create .phan/config.php</p>
<pre><code data-trim style="font-size:1em;" >&lt;?php
use \Phan\Issue;
return [
'should_visit_all_nodes' =&gt; true,
'minimum_severity' =&gt; Issue::SEVERITY_LOW,
'directory_list' =&gt; [ 'src', 'vendor' ],
'exclude_analysis_directory_list' =&gt; [ 'vendor' ]
];</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:1em;" >$ ./vendor/bin/phan</code></pre>
</section> </section>
<section>
<section id="phan_ts">
<p class="p" style="font-size:2em;text-align:center;">Type Safety</p>
<p class="p" style="font-size:1.5em;text-align:left;">Legacy code</p>
<pre><code data-trim style="font-size:1em;" >class Data {
function __construct($data) {
$this-&gt;haystack = $data;
}
function find($needle) {
return in_array($needle, $this-&gt;haystack, true);
}
}
$storage = new Data(['apple','orange','banana']);
$fruit = false;
$storage-&gt;find($fruit);</code></pre>
</section>
<section id="phan_ts2">
<p class="p" style="font-size:1em;text-align:left;">Going straight to strict types risks runtime fatals</p>
<pre><code class="line-numbers" data-trim style="font-size:1em;" data-highlight-lines='6,13'>&lt;?php declare(strict_types=1);
class Data {
function __construct(array $data) {
$this-&gt;haystack = $data;
}
function find(string $needle):bool {
return in_array($needle, $this-&gt;haystack, true);
}
}
$storage = new Data(['apple','orange','banana']);
$fruit = false;
$storage-&gt;find($fruit);</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:.65em;" >Fatal error: Uncaught TypeError: Argument 1 passed to Data::find() must be of the type string, boolean given,
called in test.php on line 13 and defined in test.php:6
Stack trace:
#0 test.php(13): Data-&gt;find(false)
#1 {main}
thrown in test.php on line 6</code></pre>
</section>
<section id="phan_ts3">
<p class="p" style="font-size:1em;text-align:left;">Intermediate step</p>
<pre><code class="line-numbers" data-trim style="font-size:.75em;" data-highlight-lines='15,22'>class Data {
/** @var array $haystack */
public $haystack;
/**
* @param array $data
*/
function __construct($data) {
$this-&gt;haystack = $data;
}
/**
* @param string $needle
* @return bool
*/
function find($needle) {
return in_array($needle, $this-&gt;haystack, true);
}
}
$storage = new Data(['apple','orange','banana']);
$fruit = false;
$storage-&gt;find($fruit);</code></pre>
<pre><code class="shell nohighlight" data-trim style="font-size:.65em;" >$ phan test.php
test.php:22 PhanTypeMismatchArgument Argument 1 (needle) is bool but \Data::find() takes string defined at test.php:15</code></pre>
</section> </section>
<section>
<section id="thank_you">
<h2 style="text-align:center;">Thank You</h2>
<div align="left" style="font-size: 1.2em; color: ; text-align: left; margin-left: 2em; margin-right: ; margin-top: ; margin-bottom: ;"><a href="https://github.com/rlerdorf/phan" target="">https://github.com/rlerdorf/phan</a></div>
<div align="left" style="font-size: 1.2em; color: ; text-align: left; margin-left: 2em; margin-right: ; margin-top: ; margin-bottom: ;"><a href="https://bugs.php.net" target="">https://bugs.php.net</a></div>
<div align="left" style="font-size: 1.2em; color: ; text-align: left; margin-left: 2em; margin-right: ; margin-top: ; margin-bottom: ;"><a href=":-:url:-:" target="">http://talks.php.net/tweakers</a></div>
<br/>
<br/>
<br/>
<p class="p" style="font-size:1.1em;">Report Bugs</p>
<p class="p" style="font-size:1.1em;">Useful bug reports, please!</p>
</section> </section>
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