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PHP: Server Specific Extensions - Manual
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>PHP: Server Specific Extensions - Manual </title> <link rel="icon" type="image/svg+xml" sizes="any" href="https://www.php.net/favicon.svg?v=2"> <link rel="icon" type="image/png" sizes="196x196" href="https://www.php.net/favicon-196x196.png?v=2"> <link rel="icon" type="image/png" sizes="32x32" href="https://www.php.net/favicon-32x32.png?v=2"> <link rel="icon" type="image/png" sizes="16x16" href="https://www.php.net/favicon-16x16.png?v=2"> <link rel="shortcut icon" href="https://www.php.net/favicon.ico?v=2"> <link rel="search" type="application/opensearchdescription+xml" href="http://php.net/phpnetimprovedsearch.src" title="Add PHP.net search"> <link rel="alternate" type="application/atom+xml" href="https://www.php.net/releases/feed.php" title="PHP Release feed"> <link rel="alternate" type="application/atom+xml" 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Extensions</a></dd> <dd><a href='/manual/en/refs.crypto.php'>Cryptography Extensions</a></dd> <dd><a href='/manual/en/refs.database.php'>Database Extensions</a></dd> <dd><a href='/manual/en/refs.calendar.php'>Date and Time Related Extensions</a></dd> <dd><a href='/manual/en/refs.fileprocess.file.php'>File System Related Extensions</a></dd> <dd><a href='/manual/en/refs.international.php'>Human Language and Character Encoding Support</a></dd> <dd><a href='/manual/en/refs.utilspec.image.php'>Image Processing and Generation</a></dd> <dd><a href='/manual/en/refs.remote.mail.php'>Mail Related Extensions</a></dd> <dd><a href='/manual/en/refs.math.php'>Mathematical Extensions</a></dd> <dd><a href='/manual/en/refs.utilspec.nontext.php'>Non-Text MIME Output</a></dd> <dd><a href='/manual/en/refs.fileprocess.process.php'>Process Control Extensions</a></dd> <dd><a href='/manual/en/refs.basic.other.php'>Other Basic Extensions</a></dd> <dd><a href='/manual/en/refs.remote.other.php'>Other Services</a></dd> <dd><a href='/manual/en/refs.search.php'>Search Engine Extensions</a></dd> <dd><a href='/manual/en/refs.utilspec.server.php'>Server Specific Extensions</a></dd> <dd><a href='/manual/en/refs.basic.session.php'>Session Extensions</a></dd> <dd><a href='/manual/en/refs.basic.text.php'>Text Processing</a></dd> <dd><a href='/manual/en/refs.basic.vartype.php'>Variable and Type Related Extensions</a></dd> <dd><a href='/manual/en/refs.webservice.php'>Web Services</a></dd> <dd><a href='/manual/en/refs.utilspec.windows.php'>Windows Only Extensions</a></dd> <dd><a href='/manual/en/refs.xml.php'>XML Manipulation</a></dd> <dd><a href='/manual/en/refs.ui.php'>GUI Extensions</a></dd> </dl> <dl> <dt>Keyboard Shortcuts</dt><dt>?</dt> <dd>This help</dd> <dt>j</dt> <dd>Next menu item</dd> <dt>k</dt> <dd>Previous menu item</dd> <dt>g p</dt> <dd>Previous man page</dd> <dt>g n</dt> <dd>Next man page</dd> <dt>G</dt> <dd>Scroll to bottom</dd> <dt>g g</dt> <dd>Scroll to top</dd> <dt>g h</dt> <dd>Goto homepage</dd> <dt>g s</dt> <dd>Goto search<br>(current page)</dd> <dt>/</dt> <dd>Focus search box</dd> </dl></div></nav> <div id="goto"> <div class="search"> <div class="text"></div> <div class="results"><ul></ul></div> </div> </div> <div id="breadcrumbs" class="clearfix"> <div id="breadcrumbs-inner"> <div class="next"> <a href="book.apache.php"> Apache » </a> </div> <div class="prev"> <a href="class.solrmissingmandatoryparameterexception.php"> « SolrMissingMandatoryParameterException </a> </div> <ul> <li><a href='index.php'>PHP Manual</a></li> <li><a href='funcref.php'>Function Reference</a></li> </ul> </div> </div> <div id="layout" class="clearfix"> <section id="layout-content"> <div class="page-tools"> <div class="change-language"> <form action="/manual/change.php" method="get" id="changelang" name="changelang"> <fieldset> <label for="changelang-langs">Change language:</label> <select onchange="document.changelang.submit()" name="page" id="changelang-langs"> <option 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chunklist_set chunklist_children"><li><a href="intro.apache.php">Introduction</a></li><li><a href="apache.setup.php">Installing/Configuring</a></li><li><a href="ref.apache.php">Apache Functions</a></li></ul></li><li><a href="book.fpm.php">FastCGI Process Manager</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="intro.fpm.php">Introduction</a></li><li><a href="fpm.setup.php">Installing/Configuring</a></li><li><a href="fpm.observability.php">Observability</a></li><li><a href="ref.fpm.php">FPM Functions</a></li></ul></li></ul></div> <div class="contribute"> <h3 class="title">Improve This Page</h3> <div> </div> <div class="edit-bug"> <a href="https://github.com/php/doc-base/blob/master/README.md" title="This will take you to our contribution guidelines on GitHub" target="_blank" rel="noopener noreferrer">Learn How To Improve This Page</a> • <a href="https://github.com/php/doc-base/blob/master/manual.xml.in">Submit a Pull Request</a> • <a 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Services">Authentication Services</a> </li> <li class=""> <a href="refs.utilspec.cmdline.php" title="Command Line Specific Extensions">Command Line Specific Extensions</a> </li> <li class=""> <a href="refs.compression.php" title="Compression and Archive Extensions">Compression and Archive Extensions</a> </li> <li class=""> <a href="refs.crypto.php" title="Cryptography Extensions">Cryptography Extensions</a> </li> <li class=""> <a href="refs.database.php" title="Database Extensions">Database Extensions</a> </li> <li class=""> <a href="refs.calendar.php" title="Date and Time Related Extensions">Date and Time Related Extensions</a> </li> <li class=""> <a href="refs.fileprocess.file.php" title="File System Related Extensions">File System Related Extensions</a> </li> <li class=""> <a href="refs.international.php" title="Human Language and Character Encoding Support">Human Language and Character Encoding Support</a> </li> <li class=""> <a href="refs.utilspec.image.php" title="Image Processing and Generation">Image Processing and Generation</a> </li> <li class=""> <a href="refs.remote.mail.php" title="Mail Related Extensions">Mail Related Extensions</a> </li> <li class=""> <a href="refs.math.php" title="Mathematical Extensions">Mathematical Extensions</a> </li> <li class=""> <a href="refs.utilspec.nontext.php" title="Non-​Text MIME Output">Non-​Text MIME Output</a> </li> <li class=""> <a href="refs.fileprocess.process.php" title="Process Control Extensions">Process Control Extensions</a> </li> <li class=""> <a href="refs.basic.other.php" title="Other Basic Extensions">Other Basic Extensions</a> </li> <li class=""> <a href="refs.remote.other.php" title="Other Services">Other Services</a> </li> <li class=""> <a href="refs.search.php" title="Search Engine Extensions">Search Engine Extensions</a> </li> <li class="current"> <a href="refs.utilspec.server.php" title="Server Specific Extensions">Server Specific Extensions</a> </li> <li class=""> <a 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