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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>Using old code with new versions of PHP</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="tutorial.forms.html">Dealing with Forms</a></div> <div class="next" style="text-align: right; float: right;"><a href="tutorial.whatsnext.html">What's next?</a></div> <div class="up"><a href="tutorial.html">A simple tutorial</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="tutorial.oldcode" class="section">   <div class="info"><h1 class="title">Using old code with new versions of PHP</h1></div>   <p class="para">    Now that PHP has grown to be a popular scripting language, there are    a lot of public repositories and libraries containing code you can reuse.    The PHP developers have largely tried to preserve backwards compatibility,     so a script written for an older version will run (ideally) without changes    in a newer version of PHP. In practice, some changes will usually be needed.   </p>   <p class="para">    Two of the most important recent changes that affect old code are:    <ul class="itemizedlist">     <li class="listitem">      <span class="simpara">       The deprecation of the old <var class="varname">$HTTP_*_VARS</var> arrays       (which need to be indicated as global when used inside a function or       method).  The following        <a href="language.variables.superglobals.html" class="link">superglobal arrays</a>       were introduced in PHP <a href="http://www.php.net/releases/4_1_0.php" class="link external">&raquo; 4.1.0</a>.        They are: <var class="varname"><a href="reserved.variables.get.html" class="classname">$_GET</a></var>, <var class="varname"><a href="reserved.variables.post.html" class="classname">$_POST</a></var>,        <var class="varname"><a href="reserved.variables.cookies.html" class="classname">$_COOKIE</a></var>, <var class="varname"><a href="reserved.variables.server.html" class="classname">$_SERVER</a></var>,        <var class="varname"><a href="reserved.variables.files.html" class="classname">$_FILES</a></var>, <var class="varname"><a href="reserved.variables.environment.html" class="classname">$_ENV</a></var>,       <var class="varname"><a href="reserved.variables.request.html" class="classname">$_REQUEST</a></var>, and <var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var>.  The       older <var class="varname">$HTTP_*_VARS</var> arrays, such as       <var class="varname">$HTTP_POST_VARS</var>, also exist.        As of PHP 5.0.0, the long PHP <a href="language.variables.predefined.html" class="link">predefined variable</a>arrays may be disabled with the <a href="ini.core.html#ini.register-long-arrays" class="link">register_long_arrays</a>directive.      </span>     </li>     <li class="listitem">      <span class="simpara">       External variables are no longer registered in the global scope by       default.  In other words, as of PHP       <a href="http://www.php.net/releases/4_2_0.php" class="link external">&raquo; 4.2.0</a> the PHP directive        <a href="ini.core.html#ini.register-globals" class="link">register_globals</a> is        <em class="emphasis">off</em> by default in <var class="filename">php.ini</var>. The preferred        method of accessing these values is via the superglobal arrays mentioned       above.  Older scripts, books, and tutorials may rely on this        directive being on.  If it were on, for example, one could use        <var class="varname">$id</var> from the URL        <i>http://www.example.com/foo.php?id=42</i>.  Whether on        or off, <var class="varname"><a href="reserved.variables.get.html" class="classname">$_GET['id']</a></var> is available.      </span>     </li>    </ul>    For more details on these changes, see the section on     <a href="language.variables.predefined.html" class="link">predefined variables</a>    and links therein.   </p>  </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="tutorial.forms.html">Dealing with Forms</a></div> <div class="next" style="text-align: right; float: right;"><a href="tutorial.whatsnext.html">What's next?</a></div> <div class="up"><a href="tutorial.html">A simple tutorial</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>
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