dl
dl
(PHP 4, PHP 5, PHP 7)
dl — Loads a PHP extension at runtime
Description
bool dl ( string $library )
Loads the PHP extension given by the parameter library.
Use extension_loaded() to test whether a given extension is already available or not. This works on both built-in extensions and dynamically loaded ones (either through php.ini or dl()).
Warning
This function was removed from most SAPIs in PHP 5.3.0, and was removed from PHP-FPM in PHP 7.0.0.
Parameters
library
This parameter is only the filename of the extension to load which also depends on your platform. For example, the sockets extension (if compiled as a shared module, not the default!) would be called sockets.so on Unix platforms whereas it is called php_sockets.dll on the Windows platform.
The directory where the extension is loaded from depends on your platform:
Windows - If not explicitly set in the php.ini, the extension is loaded from C:\php5\ by default.
Unix - If not explicitly set in the php.ini, the default extension directory depends on
- whether PHP has been built with
--enable-debugor not
- whether PHP has been built with (experimental) ZTS (Zend Thread Safety) support or not
- the current internal
ZEND_MODULE_API_NO(Zend internal moduleAPInumber, which is basically the date on which a major moduleAPIchange happened, e.g.20010901)
Taking into account the above, the directory then defaults to <install-dir>/lib/php/extensions/ <debug-or-not>-<zts-or-not>-ZEND_MODULE_API_NO, e.g. /usr/local/php/lib/php/extensions/debug-non-zts-20010901 or /usr/local/php/lib/php/extensions/no-debug-zts-20010901.
Return Values
Returns TRUE on success or FALSE on failure. If the functionality of loading modules is not available or has been disabled (either by setting enable_dl off or by enabling safe mode in php.ini) an E_ERROR is emitted and execution is stopped. If dl() fails because the specified library couldn't be loaded, in addition to FALSE an E_WARNING message is emitted.
Examples
Example #1 dl() examples
<?php
// Example loading an extension based on OS
if (!extension_loaded('sqlite')) {
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
dl('php_sqlite.dll'
} else {
dl('sqlite.so'
}
}
// Or using PHP_SHLIB_SUFFIX constant
if (!extension_loaded('sqlite')) {
$prefix = (PHP_SHLIB_SUFFIX === 'dll') ? 'php_' : '';
dl($prefix . 'sqlite.' . PHP_SHLIB_SUFFIX
}
?>
Changelog
| Version | Description |
|---|---|
| 7.0.0 | dl() is disabled in PHP-FPM. |
| 5.3.9 | dl() is enabled in PHP-FPM, albeit discouraged. |
| 5.3.0 | dl() is now disabled in some SAPIs due to stability issues. The only SAPIs that allow dl() are CLI and Embed. Use the Extension Loading Directives instead. |
Notes
Note:dl()isnotsupported when PHP is built with ZTS support. Use the Extension Loading Directives instead.
Note:dl()is case sensitive on Unix platforms.
Note: This function is disabled when PHP is running in safe mode.
See Also
- extension_loaded() - Find out whether an extension is loaded
← cli_set_process_title
extension_loaded →
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
