📄 migration52.incompatible.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Backward Incompatible Changes</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="migration52.html">Migrating from PHP 5.1.x to PHP 5.2.x</a></div> <div class="next" style="text-align: right; float: right;"><a href="migration52.error-messages.html">New Error Messages</a></div> <div class="up"><a href="migration52.html">Migrating from PHP 5.1.x to PHP 5.2.x</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="migration52.incompatible" class="section"> <h2 class="title">Backward Incompatible Changes</h2> <p class="para"> Although most existing PHP 5 code should work without changes, you should pay attention to the following backward incompatible changes: </p> <ul class="itemizedlist"> <li class="listitem"> <span class="simpara"> <a href="function.getrusage.html" class="function">getrusage()</a> returns <b><tt>NULL</tt></b> when passed incompatible arguments as of PHP 5.2.1. </span> </li> <li class="listitem"> <span class="simpara"> <a href="function.ziparchive-setCommentName.html" class="link"><a href="function.ziparchive-setCommentName.html" class="function">ZipArchive::setCommentName()</a></a> returns <b><tt>TRUE</tt></b> on success as of PHP 5.2.1. </span> </li> <li class="listitem"> <span class="simpara"> <a href="function.ziparchive-setcommentindex.html" class="link"><a href="function.ziparchive-setcommentindex.html" class="function">ZipArchive::setCommentIndex()</a></a> returns <b><tt>TRUE</tt></b> on success as of PHP 5.2.1. </span> </li> <li class="listitem"> <span class="simpara"> <b>SplFileObject::getFilename()</b> returns the filename, not relative/path/to/file, as of PHP 5.2.1. </span> </li> <li class="listitem"> <span class="simpara"> Changed priority of <var class="varname">PHPRC</var> environment variable on Win32 </span> <span class="simpara"> The <var class="varname">PHPRC</var> environment variable now takes priority over the path stored in the Windows registry. </span> </li> <li class="listitem"> <span class="simpara"> CLI SAPI no longer checks cwd for <var class="filename">php.ini</var> or the <var class="filename">php-cli.ini</var> file </span> <span class="simpara"> In PHP 5.1.x an undocumented feature was added that made the CLI binary check the current working directory for a PHP configuration file, potentially leading to unpredictable behavior if an unexpected configuration file were read. This functionality was removed in 5.2.0, and PHP will no longer search CWD for the presence of <var class="filename">php.ini</var> or <var class="filename">php-cli.ini</var> files. See also the <a href="features.commandline.html" class="link">command line</a> section of the manual. </span> </li> <li class="listitem"> <span class="simpara"> Added a warning when performing modulus 0 operations </span> <span class="simpara"> In earlier versions of PHP, performing integer % 0 did not emit any warning messages, instead returning an unexpected return value of <b><tt>FALSE</tt></b>. As of PHP 5.2.0, this operation will emit an <b><tt>E_WARNING</tt></b>, as is the case in all other instances where division by zero is performed. </span> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">print </span><span style="color: #0000BB">10 </span><span style="color: #007700">% </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /></span><span style="color: #FF8000">/* Warning: Division by zero in filename on line n */<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </li> <li class="listitem"> <span class="simpara"> Changed <b>__toString()</b> to be called wherever applicable. </span> <span class="simpara"> The magic method <b>__toString()</b> will now be called in a string context, that is, anywhere an object is used as a string. </span> <span class="simpara"> The fallback of returning a string that contains the object identifier was dropped in PHP 5.2.0. It became problematic because an object identifier cannot be considered unique. This change will mean that your application is flawed if you have relied on the object identifier as a return value. An attempt to use that value as a string will now result in a catchable fatal error. </span> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">foo </span><span style="color: #007700">{}<br /></span><span style="color: #0000BB">$foo </span><span style="color: #007700">= new </span><span style="color: #0000BB">foo</span><span style="color: #007700">;<br />print </span><span style="color: #0000BB">$foo</span><span style="color: #007700">;<br /></span><span style="color: #FF8000">/* Catchable fatal error: Object of class foo could<br /> not be converted to string in filename on line n */<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <span class="simpara"> Even with <b>__toString()</b>, objects cannot be used as array indices or keys. We may add built-in hash support for this at a later date, but as of PHP 5.2.x you will need to either provide your own hashing or use the new SPL function <a href="function.spl-object-hash.html" class="function">spl_object_hash()</a>. </span> <span class="simpara"> Exceptions can not be thrown from <b>__toString()</b> methods. </span> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">foo </span><span style="color: #007700">{<br /> public function </span><span style="color: #0000BB">__toString</span><span style="color: #007700">() {<br /> throw new </span><span style="color: #0000BB">Exception</span><span style="color: #007700">;<br /> }<br />}<br /><br />try {<br /> print new </span><span style="color: #0000BB">foo</span><span style="color: #007700">;<br /> </span><span style="color: #FF8000">/* Fatal error: Method foo::__toString() must<br /> not throw an exception in filename on line n */<br /></span><span style="color: #007700">} catch(</span><span style="color: #0000BB">Exception $e</span><span style="color: #007700">) {}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </li> <li class="listitem"> <span class="simpara"> Dropped abstract static class functions. </span> <span class="simpara"> Due to an oversight, PHP 5.0.x and 5.1.x allowed abstract static functions in classes. As of PHP 5.2.x, only interfaces can have them. </span> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">abstract class </span><span style="color: #0000BB">foo </span><span style="color: #007700">{<br /> abstract static function </span><span style="color: #0000BB">bar</span><span style="color: #007700">();<br /> </span><span style="color: #FF8000">/* Strict Standards: Static function foo::bar()<br /> should not be abstract in filename on line n */<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </li> <li class="listitem"> <span class="simpara"> <a href="ref.oci8.html" class="link">Oracle extension</a> requires at least Oracle 10 on Windows. </span> </li> <li class="listitem"> <span class="simpara"> Added RFC2397 (<i>data:</i> stream) support. </span> <span class="simpara"> The introduction of the 'data' URL scheme has the potential to lead to a change of behavior under Windows. If you are working with a <acronym>NTFS</acronym> file system and making use of meta streams in your application, and if you just happen to be using a file with the name 'data:' that is accessed without any path information - it won't work any more. The fix is to use the 'file:' protocol when accessing it. </span> <span class="simpara"> See also <a href="http://www.faqs.org/rfcs/rfc2397" class="link external">» RFC 2397</a> </span> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">/* when allow_url_include is OFF (default) */<br /></span><span style="color: #007700">include </span><span style="color: #DD0000">"data:;base64,PD9waHAgcGhwaW5mbygpOz8+"</span><span style="color: #007700">;<br /></span><span style="color: #FF8000">/* Warning: include(): URL file-access is disabled<br /> in the server configuration in filename on line n */<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </li> <li class="listitem"> <span class="simpara"> Regression in <i>glob()</i> patterns </span> <span class="simpara"> In version 5.2.4 a security fix caused a regression for patterns of the form "/foo/*/bar/*". Since version 5.2.5 instead of raising a warning the <i>glob()</i> function will return <b><tt>FALSE</tt></b> when <i>openbase_dir</i> restrictions are violated. </span> </li> </ul> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="migration52.html">Migrating from PHP 5.1.x to PHP 5.2.x</a></div> <div class="next" style="text-align: right; float: right;"><a href="migration52.error-messages.html">New Error Messages</a></div> <div class="up"><a href="migration52.html">Migrating from PHP 5.1.x to PHP 5.2.x</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -