How to check if a file exists under include path?

Question

You get the current include path in PHP by using get_include_path()

I am wondering what is the lightweight way to check if the file can be included without

Answer 1

Before PHP 5.3.2 you can split the path and check each path in a loop:

$find = 'file.php'; //The file to find
$paths = explode(PATH_SEPARATOR, get_include_path());
$found = false;
foreach($paths as $p) {
  $fullname = $p.DIRECTORY_SEPARATOR.$find;
  if(is_file($fullname)) {
    $found = $fullname;
    break;
  }
}
//$found now contains the file to be included, or false if not found