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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Migrating from PHP 5.1.x to PHP 5.2.x</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="history.php.publications.html">Publications about PHP</a></div> <div class="next" style="text-align: right; float: right;"><a href="migration52.incompatible.html">Backward Incompatible Changes</a></div> <div class="up"><a href="appendices.html">Appendices</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1>Migrating from PHP 5.1.x to PHP 5.2.x</h1><h2>Table of Contents</h2><ul class="chunklist chunklist_appendix"><li><a href="migration52.incompatible.html">Backward Incompatible Changes</a></li><li><a href="migration52.error-messages.html">New Error Messages</a></li><li><a href="migration52.datetime.html">Changes in PHP datetime support</a></li><li><a href="migration52.parameters.html">New Parameters</a></li><li><a href="migration52.functions.html">New Functions</a></li><li><a href="migration52.methods.html">New Methods</a></li><li><a href="migration52.removed-extensions.html">Removed Extensions</a></li><li><a href="migration52.new-extensions.html">New Extensions</a></li><li><a href="migration52.classes.html">New Classes</a></li><li><a href="migration52.global-constants.html">New Global Constants</a></li><li><a href="migration52.class-constants.html">New Class Constants</a></li><li><a href="migration52.newconf.html">New INI Configuration Directives</a></li><li><a href="migration52.errorrep.html">Error Reporting</a></li><li><a href="migration52.other.html">Other Enhancements</a></li></ul> <p class="para"> See also the migration guides for PHP versions <a href="migration5.html" class="link">5.0.x</a> and <a href="migration51.html" class="link">5.1.x</a>. </p> <div id="migration52.changes" class="section"> <h2 class="title">What has changed in PHP 5.2.x</h2> <p class="para"> Most improvements in PHP 5.2.x have no impact on existing code. There are a <a href="migration52.incompatible.html" class="link">few incompatibilities</a> and <a href="migration52.error-messages.html" class="link">new error messages</a> that should be considered, and code should be tested before switching PHP versions in production environments. </p> <p class="para"> If the system is being upgraded from PHP 5.0.x, the manual section titled <a href="migration51.html" class="link">Upgrade Notes for PHP 5.1.x</a> should also be read. </p> <p class="para"> Similarly, if the system is being upgraded from PHP 4, the manual section titled <a href="migration5.html" class="link">Migrating from PHP 4 to PHP 5</a> should be read as well. </p> </div> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="history.php.publications.html">Publications about PHP</a></div> <div class="next" style="text-align: right; float: right;"><a href="migration52.incompatible.html">Backward Incompatible Changes</a></div> <div class="up"><a href="appendices.html">Appendices</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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