<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Predefined Constants</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="reserved.classes.html">Predefined Classes</a></div>
<div class="next" style="text-align: right; float: right;"><a href="resource.html">List of Resource Types</a></div>
<div class="up"><a href="reserved.html">List of Reserved Words</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="reserved.constants" class="sect1">
<h2 class="title">Predefined Constants</h2>
<div class="sect2" id="reserved.constants.core">
<h3 class="title">Core Predefined Constants</h3>
<p class="simpara">
These constants are defined by the PHP core. This includes PHP,
the Zend engine, and SAPI modules.
</p>
<dl>
<dt id="constant.php-version">
<span class="term">
<strong><code>PHP_VERSION</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
The current PHP version as a string in
"major.minor.release[extra]" notation.
</span>
</dd>
</dt>
<dt id="constant.php-major-version">
<span class="term">
<strong><code>PHP_MAJOR_VERSION</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
The current PHP "major" version as an integer (e.g., int(5)
from version "5.2.7-extra"). Available since PHP 5.2.7.
</span>
</dd>
</dt>
<dt id="constant.php-minor-version">
<span class="term">
<strong><code>PHP_MINOR_VERSION</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
The current PHP "minor" version as an integer (e.g., int(2)
from version "5.2.7-extra"). Available since PHP 5.2.7.
</span>
</dd>
</dt>
<dt id="constant.php-release-version">
<span class="term">
<strong><code>PHP_RELEASE_VERSION</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
The current PHP "release" version as an integer (e.g., int(7)
from version "5.2.7-extra"). Available since PHP 5.2.7.
</span>
</dd>
</dt>
<dt id="constant.php-version-id">
<span class="term">
<strong><code>PHP_VERSION_ID</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
The current PHP version as an integer, useful for
version comparisons (e.g., int(50207) from version "5.2.7-extra").
Available since PHP 5.2.7.
</span>
</dd>
</dt>
<dt id="constant.php-extra-version">
<span class="term">
<strong><code>PHP_EXTRA_VERSION</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
The current PHP "extra" version as a string (e.g., '-extra'
from version "5.2.7-extra"). Often used by distribution
vendors to indicate a package version. Available since
PHP 5.2.7.
</span>
</dd>
</dt>
<dt id="constant.php-zts">
<span class="term">
<strong><code>PHP_ZTS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Available since PHP 5.2.7.
</span>
</dd>
</dt>
<dt id="constant.php-debug">
<span class="term">
<strong><code>PHP_DEBUG</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Available since PHP 5.2.7.
</span>
</dd>
</dt>
<dt id="constant.php-maxpathlen">
<span class="term">
<strong><code>PHP_MAXPATHLEN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
The maximum length of filenames (including path) supported
by this build of PHP. Available since PHP 5.3.0.
</span>
</dd>
</dt>
<dt id="constant.php-os">
<span class="term">
<strong><code>PHP_OS</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-sapi">
<span class="term">
<strong><code>PHP_SAPI</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
The Server API for this build of PHP. Available since PHP 4.2.0.
See also <span class="function"><a href="function.php-sapi-name.html" class="function">php_sapi_name()</a></span>.
</span>
</dd>
</dt>
<dt id="constant.php-eol">
<span class="term">
<strong><code>PHP_EOL</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
The correct 'End Of Line' symbol for this platform.
Available since PHP 4.3.10 and PHP 5.0.2
</span>
</dd>
</dt>
<dt id="constant.php-int-max">
<span class="term">
<strong><code>PHP_INT_MAX</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
The largest integer supported in this build of PHP. Usually int(2147483647).
Available since PHP 4.4.0 and PHP 5.0.5
</span>
</dd>
</dt>
<dt id="constant.php-int-size">
<span class="term">
<strong><code>PHP_INT_SIZE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Available since PHP 4.4.0 and PHP 5.0.5
</span>
</dd>
</dt>
<dt id="constant.default-include-path">
<span class="term">
<strong><code>DEFAULT_INCLUDE_PATH</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.pear-install-dir">
<span class="term">
<strong><code>PEAR_INSTALL_DIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.pear-extension-dir">
<span class="term">
<strong><code>PEAR_EXTENSION_DIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-extension-dir">
<span class="term">
<strong><code>PHP_EXTENSION_DIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-prefix">
<span class="term">
<strong><code>PHP_PREFIX</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
The value "--prefix" was set to at configure. Available since PHP 4.3.0.
</span>
</dd>
</dt>
<dt id="constant.php-bindir">
<span class="term">
<strong><code>PHP_BINDIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
Specifies where the binaries were installed into.
</span>
</dd>
</dt>
<dt id="constant.php-binary">
<span class="term">
<strong><code>PHP_BINARY</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
Specifies the PHP binary path during script execution.
Available since PHP 5.4.
</span>
</dd>
</dt>
<dt id="constant.php-mandir">
<span class="term">
<strong><code>PHP_MANDIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
Specifies where the manpages were installed into.
Available since PHP 5.3.7.
</span>
</dd>
</dt>
<dt id="constant.php-libdir">
<span class="term">
<strong><code>PHP_LIBDIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-datadir">
<span class="term">
<strong><code>PHP_DATADIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-sysconfdir">
<span class="term">
<strong><code>PHP_SYSCONFDIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-localstatedir">
<span class="term">
<strong><code>PHP_LOCALSTATEDIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-config-file-path">
<span class="term">
<strong><code>PHP_CONFIG_FILE_PATH</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-config-file-scan-dir">
<span class="term">
<strong><code>PHP_CONFIG_FILE_SCAN_DIR</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.php-shlib-suffix">
<span class="term">
<strong><code>PHP_SHLIB_SUFFIX</code></strong>
(<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
</span>
<dd>
<span class="simpara">
The build-platform's shared library suffix, such as "so" (most Unixes)
or "dll" (Windows). Available since PHP 4.3.0
</span>
</dd>
</dt>
<dt id="constant.e-error">
<span class="term">
<strong><code>E_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<a href="errorfunc.constants.html" class="link">Error reporting constant</a>
</span>
</dd>
</dt>
<dt id="constant.e-warning">
<span class="term">
<strong><code>E_WARNING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-parse">
<span class="term">
<strong><code>E_PARSE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-notice">
<span class="term">
<strong><code>E_NOTICE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-core-error">
<span class="term">
<strong><code>E_CORE_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-core-warning">
<span class="term">
<strong><code>E_CORE_WARNING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-compile-error">
<span class="term">
<strong><code>E_COMPILE_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-compile-warning">
<span class="term">
<strong><code>E_COMPILE_WARNING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-user-error">
<span class="term">
<strong><code>E_USER_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-user-warning">
<span class="term">
<strong><code>E_USER_WARNING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-user-notice">
<span class="term">
<strong><code>E_USER_NOTICE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-deprecated">
<span class="term">
<strong><code>E_DEPRECATED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Available since PHP 5.3.0
</span>
</dd>
</dt>
<dt id="constant.e-user-deprecated">
<span class="term">
<strong><code>E_USER_DEPRECATED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Available since PHP 5.3.0
</span>
</dd>
</dt>
<dt id="constant.e-all">
<span class="term">
<strong><code>E_ALL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.e-strict">
<span class="term">
<strong><code>E_STRICT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Available since PHP 5.0.0
</span>
</dd>
</dt>
<dt id="constant.compiler-halt-offset">
<span class="term">
<strong><code>__COMPILER_HALT_OFFSET__</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Available since PHP 5.1.0
</span>
</dd>
</dt>
<dt id="constant.true">
<span class="term">
<strong><code>TRUE</code></strong>
(<span class="type"><a href="language.types.boolean.html" class="type boolean">boolean</a></span>)
</span>
<dd>
<span class="simpara">
See <a href="language.types.boolean.html" class="link">Booleans</a>.
</span>
</dd>
</dt>
<dt id="constant.false">
<span class="term">
<strong><code>FALSE</code></strong>
(<span class="type"><a href="language.types.boolean.html" class="type boolean">boolean</a></span>)
</span>
<dd>
<span class="simpara">
See <a href="language.types.boolean.html" class="link">Booleans</a>.
</span>
</dd>
</dt>
<dt id="constant.null">
<span class="term">
<strong><code>NULL</code></strong>
(<span class="type"><a href="language.types.boolean.html" class="type boolean">boolean</a></span>)
</span>
<dd>
<span class="simpara">
See <a href="language.types.null.html" class="link">Null</a>.
</span>
</dd>
</dt>
</dl>
<p class="para">
See also: <a href="language.constants.predefined.html" class="link">Magic
constants</a>.
</p>
</div>
<div class="sect2" id="reserved.constants.standard">
<h3 class="title">Standard Predefined Constants</h3>
<p class="simpara">
All constants from <a href="extensions.membership.html#extensions.membership.core" class="link">core
extensions</a> are defined in PHP by default.
</p>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="reserved.classes.html">Predefined Classes</a></div>
<div class="next" style="text-align: right; float: right;"><a href="resource.html">List of Resource Types</a></div>
<div class="up"><a href="reserved.html">List of Reserved Words</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
