📄 configuration.html

📁 php的帮助文档,涉及到PHP的案例和基本语法,以及实际应用内容
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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>Runtime Configuration</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="install.html">Installation and Configuration</a></div> <div class="next" style="text-align: right; float: right;"><a href="configuration.changes.html">How to change configuration settings</a></div> <div class="up"><a href="install.html">Installation and Configuration</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div>  <h1>Runtime Configuration</h1><h2>Table of Contents</h2><ul class="chunklist chunklist_chapter"><li><a href="configuration.changes.html">How to change configuration settings</a></li></ul>  <div id="configuration.file" class="sect1">   <h2 class="title">The configuration file</h2>   <p class="simpara">    The configuration file (<var class="filename">php.ini</var>)    is read when PHP starts up. For the server module versions of PHP,    this happens only once when the web server is started. For the    <acronym title="Common Gateway Interface">CGI</acronym> and <acronym title="Command Line Interpreter/Interface">CLI</acronym> version, it happens on    every invocation.   </p>   <p class="para">    <var class="filename">php.ini</var> is searched in these locations (in order):    <ul class="itemizedlist">     <li class="listitem">      <p class="para">       SAPI module specific location (<i>PHPIniDir</i> directive       in Apache 2, <i>-c</i> command line option in CGI and CLI,       <i>php_ini</i> parameter in NSAPI,       <i>PHP_INI_PATH</i> environment variable in THTTPD)      </p>     </li>     <li class="listitem">      <p class="para">       The <var class="varname">PHPRC</var> environment variable. Before PHP 5.2.0       this was checked after the registry key mentioned below.      </p>     </li>     <li class="listitem">      <p class="para">       As of PHP 5.2.0, the following registry locations are searched in       order:       <i>HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x.y.z\IniFilePath</i>,       <i>HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x.y\IniFilePath</i> and       <i>HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x\IniFilePath</i>, where       x, y and z mean the PHP major, minor and release versions.      </p>     </li>     <li class="listitem">      <p class="para">       <i>HKEY_LOCAL_MACHINE\SOFTWARE\PHP\IniFilePath</i>       (Windows Registry location)      </p>     </li>     <li class="listitem">      <p class="para">       Current working directory (except CLI)      </p>     </li>     <li class="listitem">      <p class="para">       The web server&#039;s directory (for SAPI modules), or directory of PHP       (otherwise in Windows)      </p>     </li>     <li class="listitem">      <p class="para">       Windows directory (<var class="filename">C:\windows</var>       or <var class="filename">C:\winnt</var>) (for Windows), or       <i>--with-config-file-path</i> compile time option      </p>     </li>    </ul>    </p>   <p class="para">    If <var class="filename">php-SAPI.ini</var> exists (where SAPI is used SAPI, so the    filename is e.g. <var class="filename">php-cli.ini</var> or    <var class="filename">php-apache.ini</var>), it&#039;s used instead of <var class="filename">php.ini</var>.    SAPI name can be determined by <a href="function.php-sapi-name.html" class="function">php_sapi_name()</a>.   </p>   <blockquote><p><b class="note">Note</b>:          The Apache web server changes the directory to root at startup causing     PHP to attempt to read <var class="filename">php.ini</var> from the root filesystem if it exists.    <br />   </p></blockquote>   <p class="para">    The <var class="filename">php.ini</var> directives handled by extensions are documented respectively    on the pages of the extensions themselves. The <a href="ini.html" class="link">list of    the core directives</a> is available in the appendix. Probably not all    PHP directives are documented in the manual though. For a complete list    of directives available in your PHP version, please read your well commented    <var class="filename">php.ini</var> file. Alternatively, you may find the    <a href="http://cvs.php.net/viewvc.cgi/php-src/php.ini-dist?view=co" class="link external">&raquo; the latest <var class="filename">php.ini</var></a> from CVS    helpful too.   </p>   <p class="para">    <div class="example">     <p><b>Example #1 <var class="filename">php.ini</var> example</b></p>     <div class="example-contents"><div class="cdata"><pre>; any text on a line after an unquoted semicolon (;) is ignored[php] ; section markers (text within square brackets) are also ignored; Boolean values can be set to either:;    true, on, yes; or false, off, no, noneregister_globals = offtrack_errors = yes; you can enclose strings in double-quotesinclude_path = &quot;.:/usr/local/lib/php&quot;; backslashes are treated the same as any other characterinclude_path = &quot;.;c:\php\lib&quot;</pre></div></div>    </div>   </p>   <p class="para">    Since PHP 5.1.0, it is possible to refer to existing .ini variables from    within .ini files. Example: <i>open_basedir = ${open_basedir}    &quot;:/new/dir&quot;</i>.   </p>  </div>   </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="install.html">Installation and Configuration</a></div> <div class="next" style="text-align: right; float: right;"><a href="configuration.changes.html">How to change configuration settings</a></div> <div class="up"><a href="install.html">Installation and Configuration</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>
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