取得window或linux下php路徑

if(substr(strtolower(PHP_OS), 0, 3) == 'win')
{
    $ini= ini_get_all();    
    $path = $ini['extension_dir']['local_value'];    
    $b= substr($path,0,-3);    
    $php_path = str_replace('\\','/',$b);    
    $real_path = $php_path.'php.exe';    
    if(strpos($real_path, 'ephp.exe') !== FALSE)
    {
            $real_path = str_replace('ephp.exe', 'php.exe',$real_path);    
            }
}else{    
$real_path = PHP_BINDIR.'/php';
}
echo $real_path;