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Safe_dl -- Safely Load a PHP extension at runtime

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Date: 2005-10-12

Safe_dl -- Safely Load a PHP extension at runtime

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<?php
$extension = "php_domxml";
var_dump(safe_dl($extension));
/**
* Loads extension safely
*
* Checks whether the extension is already loaded, if so does not try to reload it.
* Depending ot current OS it will try to load ".dll" or ".so" file.
* Some checks are made for GD library.
*
* @param	string	extension the extension that will be loaded
* @author Svetoslav Marinov <svetoslavm@gmail.com>
* @author Julian Lishev <proscriptum.com>
*/
function safe_dl($extension)
{
	$res = 0;
	$extension = strtolower(trim($extension));
	// if these is an extension supplied remove it
	if (($posit = strpos($extension, ".")) !== false)
		$extension = substr($extension, 0, $posit);
	// special check for gd1 & gd2
	if ($extension == 'gd' || $extension == 'gd2' )
	{
		$ar = @gd_info();
		if (is_array($ar)
					&& !empty($ar["GD Version"])
						&& (
										// gd1
										( ($extension == 'gd' && strpos($ar["GD Version"], "1.") !== false)
										||
										// gd2
										$extension == 'gd2'&& strpos($ar["GD Version"], "2.") !== false)
								)
				)
			return true;
		else
			return false;
	}
	// if already loading return true
	if (!empty($extension)
				&& extension_loaded($extension))
		return true;
	// if not extension not loaded try to load it
	if ( !empty($extension) &&
					!extension_loaded($extension) &&
					( @ini_get("enable_dl") == 1 ||
								strtolower(@ini_get("enable_dl") ) == "on")
						)
	{
		// depending on OS load appopriate extension
		$res = @dl($extension . "."
						. (strpos(strtolower(PHP_OS), "win") !== false
						? 'dll'
						: 'so'));
	}
	return $res
							? true
							: false;
}
?>

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Safe_dl -- Safely Load a PHP extension at runtime

Safe_dl -- Safely Load a PHP extension at runtime

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