/**
* Tries to find the system's PHP executable and returns it.
*
* @return string
*/
public static function getExecutable()
{
if (is_null(self::$executable)) {
if (getenv('PHP_PATH')) {
self::$executable = getenv('PHP_PATH');
if (!is_executable(self::$executable)) {
throw new Exception('The defined PHP_PATH environment variable is not a valid PHP executable.');
}
} else {
self::$executable = PHP_BINDIR . DIRECTORY_SEPARATOR . 'php';
}
}
if (!is_executable(self::$executable)) {
$path = getenv('PATH') ? getenv('PATH') : getenv('Path');
$extensions = DIRECTORY_SEPARATOR == '\\' ? getenv('PATHEXT') ? explode(PATH_SEPARATOR, getenv('PATHEXT')) : array('.exe', '.bat', '.cmd', '.com') : array('');
foreach (array('php5', 'php') as $executable) {
foreach ($extensions as $extension) {
foreach (explode(PATH_SEPARATOR, $path) as $dir) {
$file = $dir . DIRECTORY_SEPARATOR . $executable . $extension;
if (is_executable($file)) {
self::$executable = $file;
break 3;
}
}
}
}
if (!is_executable(self::$executable)) {
throw new Exception("Unable to find PHP executable.");
}
}
return self::$executable;
}
