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277 lines
6.1 KiB
PHP
Executable File
277 lines
6.1 KiB
PHP
Executable File
<?php
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// $Id$
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$_SERVER['BASE_PAGE'] = 'manual/php3.php';
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include_once $_SERVER['DOCUMENT_ROOT'] . '/include/prepend.inc';
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site_header('PHP Version 3 Documentation');
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?>
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<h1 style="text-align: center;">PHP Version 3</h1>
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<h1>Table of Contents</h1>
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<ol>
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<li><a href="#introduction">Introduction</a></li>
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<li><a href="#directives">Configuration Directives</a></li>
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<li><a href="#changed_behaviour">Changed behaviour</a></li>
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<li><a href="#misc">Miscellaneous</a></li>
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<li><a href="#migration">Migration</a></li>
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<li><a href="#debugger">Debugger</a></li>
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<li><a href="#internals">Internals</a></li>
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</ol>
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<hr />
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<h2><a name="introduction" id="introduction">Introduction</a></h2>
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<p>
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The PHP 3 documentation was removed from the PHP Manual and placed here for
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historical purposes. An attempt was made to preserve all of the text although
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it's highly likely that some is missing. The last PHP 3 release (3.0.18) was
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made on October 20, 2000.
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</p>
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<p>
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See the <a href="http://museum.php.net/">PHP Museum</a> for downloads, and
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also read the <a href="http://php.net/history">history</a> for further
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information about PHP 3.
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</p>
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<h2><a name="directives" id="directives">Configuration Directives</a></h2>
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<p>
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Most directives are prepended with php3_ instead of php_. These differences
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are not mentioned in this document.
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</p>
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<dl>
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<dt><big>Changed</big></dt>
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<dd>
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<p>
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FTP configure option changed from <em>--with-ftp</em> to <em>--enable-ftp</em>
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</p>
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</dd>
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<dd>
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<p>
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The value of E_ALL is 63.
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</p>
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</dd>
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<dd>
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<p>
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The <em>asp_tags</em> directive was added in PHP 3.0.4.
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</p>
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</dd>
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<dd>
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<p>
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The E_* constants have no meaning in <em>php3.ini</em>, but numeric values do.
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</p>
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</dd>
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</dl>
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<dl>
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<dt><big>Removed</big></dt>
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<dd>
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<p>
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<em>--with-imsp[=DIR]</em> includes IMSP support (DIR is IMSP's include dir and libimsp.a dir).
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</p>
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</dd>
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<dd>
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<p>
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<em>--with-mck[=DIR]</em> includes Cybercash MCK support. DIR is the cybercash mck build directory,
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defaults to /usr/src/mck-3.2.0.3-linux
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</p>
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</dd>
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<dd>
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<p>
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<em>--with-mod-dav=DIR</em> includes DAV support through Apache's mod_dav, DIR is mod_dav's
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installation directory (Apache module version only).
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</p>
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</dd>
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<dd>
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<p>
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If the <em>sybase.compatability_mode</em> directive is on, this will cause
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PHP to automatically assign types to results according to their Sybase
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type, instead of treating them all as strings.
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</p>
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</dd>
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</dl>
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<h2><a name="changed_behaviour" id="changed_bahaviour">Changed Behaviour</a></h2>
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<dl>
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<dt><big>Return values</big></dt>
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<dd>
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<p>
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unset() returns 1.
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</p>
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</dd>
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<dd>
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<p>
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Multiple calls to setcookie() in the same script will be performed
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in reverse order. And put the insert before the delete when trying
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to delete one cookie before inserting another.
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</p>
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</dd>
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<dd>
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<p>
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eval() does not return a value.
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</p>
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</dd>
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</dl>
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<dl>
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<dt><big>Function parameters</big></dt>
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<dd>
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<p>
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gettype() has a 'user function' return value.
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</p>
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</dd>
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<dd>
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<p>
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htmlspecialchars() added the second parameter in PHP 3.0.17.
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</p>
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</dd>
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<dd>
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<p>
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error_log()'s second parameter, message, goes through the debugger.
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</p>
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</dd>
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<dd>
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<p>
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empty() considers "0" as non-empty, a value that for example may come from an HTML form.
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</p>
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</dd>
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</dl>
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<dl>
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<dt><big>Other</big></dt>
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<dd>
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<p>
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Variables are always assigned by value, as there are no references.
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</p>
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</dd>
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<dd>
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<p>
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Using arrays within HTML forms is limited to single dimensional arrays.
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</p>
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</dd>
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<dd>
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<p>
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When escaping characters in single quoted strings, an E_NOTICE level error is generated.
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</p>
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</dd>
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<dd>
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<p>
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Objects lose their class association throughout the process of serialization and unserialization.
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</p>
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</dd>
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<dd>
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<p>
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Functions must be defined before use. In other words, top to bottom.
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</p>
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</dd>
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<dd>
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<p>
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Variable number of arguments are not supported.
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</p>
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</dd>
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<dd>
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<p>
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Return may only be used within function blocks.
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</p>
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</dd>
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</dl>
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<h2><a name="miscellaneous" id="miscellaneous">Miscellaneous</a></h2>
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<dl>
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<dd>
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<p>
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The PCRE modifier is not available.
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</p>
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</dd>
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<dd>
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<p>
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is_uploaded_file() exists as of PHP 3.0.16.
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</p>
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</dd>
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<dd>
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<p>
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BC Math is enabled by default, --disable-bcmath disables it.
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</p>
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</dd>
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<dd>
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<p>
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The behaviour of register_globals is always on, because the directive does not exist.
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</p>
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</dd>
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<dd>
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<p>
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The short_tags() function may be used to enable short tags (<?).
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</p>
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</dd>
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<dd>
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<p>
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The CGI build has a 'make bench' tool for benchmarking the build. It will likely take
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over 30 seconds to run so be sure to allow the appropriate time limit.
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</p>
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</dd>
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<dd>
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<p>
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SAPI support is not available.
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</p>
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</dd>
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<dd>
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<p>
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The HTTP PUT method is allowed for saving files, which are handled similarly to POST method
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file saves. <em>$PHP_PUT_FILENAME</em> holds the location of the temporary file created, which
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must be moved during the request else it will be deleted.
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</p>
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</dd>
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<dd>
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<p>
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ODBC is enabled by default, to disable use <em>--disable-unified-odbc</em>
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</p>
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</dd>
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<dd>
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<p>
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GD is enabled by default, to disable use <em>--without-gd</em>
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</p>
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</dd>
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<dd>
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<p>
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Installing PHP 3 in Apache:
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</p>
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<pre>
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AddModule mod_php3.c
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LoadModule php3_module modules/libphp3.so
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AddType application/x-httpd-php3 .php3
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</pre>
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</dd>
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<dd>
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<p>
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The SESAM extension is specific to PHP 3 and was removed.
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</p>
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</dd>
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</dl>
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<h2><a name="migration" id="migration">Migration</a></h2>
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<p>
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There are a few migration specific documents involving PHP 3 but due to
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their size and structure they were not added to this document.
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</p>
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<h2><a name="debugger" id="debugger">Debugger</a></h2>
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<p>
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Information related to the debugger that comes standard with PHP 3 was
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not added to this document.
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</p>
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<h2><a name="internals" id="internals">Internals</a></h2>
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<p>
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Information related to the internal workings of PHP 3 that is commonly used
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to create extensions was not added to this document.
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</p>
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<?php site_footer(); ?>
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