mirror of
https://github.com/php/web-php.git
synced 2026-03-23 23:02:13 +01:00
dd8d8bf863
This patch adds some missing newlines, trims some multiple redundant final newlines into a single one, and trims few redundant leading newlines. According to POSIX, a line is a sequence of zero or more non-'<newline>' characters plus a terminating '<newline>' character. [1] Files should normally have at least one final newline character. C89 [2] and later standards [3] mention a final newline: "A source file that is not empty shall end in a new-line character, which shall not be immediately preceded by a backslash character." Although it is not mandatory for all files to have a final newline fixed, a more consistent and homogeneous approach brings less of commit differences issues and a better development experience in certain text editors and IDEs. [1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206 [2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2 [3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2
202 lines
12 KiB
PHP
202 lines
12 KiB
PHP
<?php
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include_once $_SERVER['DOCUMENT_ROOT'] . '/include/shared-manual.inc';
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$TOC = array();
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$PARENTS = array();
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include_once dirname(__FILE__) ."/toc/ref.strings.inc";
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$setup = array (
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'home' =>
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array (
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0 => 'index.php',
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1 => 'PHP Manual',
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),
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'head' =>
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array (
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0 => 'UTF-8',
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1 => 'en',
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),
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'this' =>
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array (
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0 => 'function.strpos.php',
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1 => 'strpos',
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),
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'up' =>
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array (
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0 => 'ref.strings.php',
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1 => 'String Functions',
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),
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'prev' =>
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array (
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0 => 'function.strpbrk.php',
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1 => 'strpbrk',
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),
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'next' =>
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array (
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0 => 'function.strrchr.php',
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1 => 'strrchr',
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),
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'alternatives' =>
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array (
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),
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);
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$setup["toc"] = $TOC;
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$setup["parents"] = $PARENTS;
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manual_setup($setup);
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manual_header();
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?>
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<div id="function.strpos" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">strpos</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">strpos</span> — <span class="dc-title">Find the position of the first occurrence of a substring in a string</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.strpos-description">
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<h3 class="title">Description</h3>
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<div class="methodsynopsis dc-description">
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<span class="type"><a href="language.pseudo-types.php#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><strong>strpos</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$haystack</code></span>
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, <span class="methodparam"><span class="type"><a href="language.pseudo-types.php#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$needle</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 0</span></span>
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] )</div>
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<p class="para rdfs-comment">
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Find the numeric position of the first occurrence of
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<em><code class="parameter">needle</code></em> in the <em><code class="parameter">haystack</code></em> string.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.strpos-parameters">
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<h3 class="title">Parameters</h3>
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<p class="para">
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<dl>
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<dt>
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<span class="term"><em><code class="parameter">haystack</code></em></span>
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<dd>
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<p class="para">
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The string to search in.
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</p>
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</dd>
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</dt>
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<dt>
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<span class="term"><em><code class="parameter">needle</code></em></span>
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<dd>
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<p class="para">
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If <em><code class="parameter">needle</code></em> is not a string, it is converted
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to an integer and applied as the ordinal value of a character.
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</p>
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</dd>
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</dt>
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<dt>
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<span class="term"><em><code class="parameter">offset</code></em></span>
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<dd>
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<p class="para">
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If specified, search will start this number of characters counted from
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the beginning of the string. Unlike <span class="function"><a href="function.strrpos.php" class="function">strrpos()</a></span> and
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<span class="function"><a href="function.strripos.php" class="function">strripos()</a></span>, the offset cannot be negative.
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</p>
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</dd>
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</dt>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.strpos-returnvalues">
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<h3 class="title">Return Values</h3>
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<p class="para">
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Returns the position of where the needle exists relative to the beginning of
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the <em><code class="parameter">haystack</code></em> string (independent of offset).
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Also note that string positions start at 0, and not 1.
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</p>
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<p class="para">
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Returns <strong><code>FALSE</code></strong> if the needle was not found.
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</p>
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<div class="warning"><strong class="warning">Warning</strong><p class="simpara">This function may
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return Boolean <strong><code>FALSE</code></strong>, but may also return a non-Boolean value which
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evaluates to <strong><code>FALSE</code></strong>. Please read the section on <a href="language.types.boolean.php" class="link">Booleans</a> for more
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information. Use <a href="language.operators.comparison.php" class="link">the ===
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operator</a> for testing the return value of this
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function.</p></div>
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</div>
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<div class="refsect1 examples" id="refsect1-function.strpos-examples">
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<h3 class="title">Examples</h3>
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<p class="para">
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<div class="example" id="example-4886">
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<p><strong>Example #1 Using <em>===</em></strong></p>
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<div class="example-contents">
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<div class="phpcode"><code><span style="color: #000000">
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<span style="color: #0000BB"><?php<br>$mystring </span><span style="color: #007700">= </span><span style="color: #DD0000">'abc'</span><span style="color: #007700">;<br></span><span style="color: #0000BB">$findme </span><span style="color: #007700">= </span><span style="color: #DD0000">'a'</span><span style="color: #007700">;<br></span><span style="color: #0000BB">$pos </span><span style="color: #007700">= </span><span style="color: #0000BB">strpos</span><span style="color: #007700">(</span><span style="color: #0000BB">$mystring</span><span style="color: #007700">, </span><span style="color: #0000BB">$findme</span><span style="color: #007700">);<br><br></span><span style="color: #FF8000">// Note our use of ===. Simply == would not work as expected<br>// because the position of 'a' was the 0th (first) character.<br></span><span style="color: #007700">if (</span><span style="color: #0000BB">$pos </span><span style="color: #007700">=== </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br> echo </span><span style="color: #DD0000">"The string '</span><span style="color: #0000BB">$findme</span><span style="color: #DD0000">' was not found in the string '</span><span style="color: #0000BB">$mystring</span><span style="color: #DD0000">'"</span><span style="color: #007700">;<br>} else {<br> echo </span><span style="color: #DD0000">"The string '</span><span style="color: #0000BB">$findme</span><span style="color: #DD0000">' was found in the string '</span><span style="color: #0000BB">$mystring</span><span style="color: #DD0000">'"</span><span style="color: #007700">;<br> echo </span><span style="color: #DD0000">" and exists at position </span><span style="color: #0000BB">$pos</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br>}<br></span><span style="color: #0000BB">?></span>
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</span>
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</code></div>
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</div>
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</div>
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<div class="example" id="example-4887">
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<p><strong>Example #2 Using !==</strong></p>
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<div class="example-contents">
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<div class="phpcode"><code><span style="color: #000000">
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<span style="color: #0000BB"><?php<br>$mystring </span><span style="color: #007700">= </span><span style="color: #DD0000">'abc'</span><span style="color: #007700">;<br></span><span style="color: #0000BB">$findme </span><span style="color: #007700">= </span><span style="color: #DD0000">'a'</span><span style="color: #007700">;<br></span><span style="color: #0000BB">$pos </span><span style="color: #007700">= </span><span style="color: #0000BB">strpos</span><span style="color: #007700">(</span><span style="color: #0000BB">$mystring</span><span style="color: #007700">, </span><span style="color: #0000BB">$findme</span><span style="color: #007700">);<br><br></span><span style="color: #FF8000">// The !== operator can also be used. Using != would not work as expected<br>// because the position of 'a' is 0. The statement (0 != false) evaluates <br>// to false.<br></span><span style="color: #007700">if (</span><span style="color: #0000BB">$pos </span><span style="color: #007700">!== </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br> echo </span><span style="color: #DD0000">"The string '</span><span style="color: #0000BB">$findme</span><span style="color: #DD0000">' was found in the string '</span><span style="color: #0000BB">$mystring</span><span style="color: #DD0000">'"</span><span style="color: #007700">;<br> echo </span><span style="color: #DD0000">" and exists at position </span><span style="color: #0000BB">$pos</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br>} else {<br> echo </span><span style="color: #DD0000">"The string '</span><span style="color: #0000BB">$findme</span><span style="color: #DD0000">' was not found in the string '</span><span style="color: #0000BB">$mystring</span><span style="color: #DD0000">'"</span><span style="color: #007700">;<br>}<br></span><span style="color: #0000BB">?></span>
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</span>
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</code></div>
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</div>
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</div>
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<div class="example" id="example-4888">
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<p><strong>Example #3 Using an offset</strong></p>
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<div class="example-contents">
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<div class="phpcode"><code><span style="color: #000000">
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<span style="color: #0000BB"><?php<br></span><span style="color: #FF8000">// We can search for the character, ignoring anything before the offset<br></span><span style="color: #0000BB">$newstring </span><span style="color: #007700">= </span><span style="color: #DD0000">'abcdef abcdef'</span><span style="color: #007700">;<br></span><span style="color: #0000BB">$pos </span><span style="color: #007700">= </span><span style="color: #0000BB">strpos</span><span style="color: #007700">(</span><span style="color: #0000BB">$newstring</span><span style="color: #007700">, </span><span style="color: #DD0000">'a'</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">); </span><span style="color: #FF8000">// $pos = 7, not 0<br></span><span style="color: #0000BB">?></span>
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</span>
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</code></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.strpos-notes">
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<h3 class="title">Notes</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">This function is
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binary-safe.</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.strpos-seealso">
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<h3 class="title">See Also</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"> <span class="function"><a href="function.stripos.php" class="function" rel="rdfs-seeAlso">stripos()</a> - Find the position of the first occurrence of a case-insensitive substring in a string</span></li>
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<li class="member"> <span class="function"><a href="function.strrpos.php" class="function" rel="rdfs-seeAlso">strrpos()</a> - Find the position of the last occurrence of a substring in a string</span></li>
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<li class="member"> <span class="function"><a href="function.strripos.php" class="function" rel="rdfs-seeAlso">strripos()</a> - Find the position of the last occurrence of a case-insensitive substring in a string</span></li>
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<li class="member"> <span class="function"><a href="function.strstr.php" class="function" rel="rdfs-seeAlso">strstr()</a> - Find the first occurrence of a string</span></li>
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<li class="member"> <span class="function"><a href="function.strpbrk.php" class="function" rel="rdfs-seeAlso">strpbrk()</a> - Search a string for any of a set of characters</span></li>
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<li class="member"> <span class="function"><a href="function.substr.php" class="function" rel="rdfs-seeAlso">substr()</a> - Return part of a string</span></li>
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<li class="member"> <span class="function"><a href="function.preg-match.php" class="function" rel="rdfs-seeAlso">preg_match()</a> - Perform a regular expression match</span></li>
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</ul>
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</p>
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</div>
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</div><?php manual_footer(); ?>
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