Dutch PHP Conference 2021 - Call for Papers


(PHP 5 >= 5.3.2, PHP 7, PHP 8)

stream_resolve_include_path Resolve filename against the include path


stream_resolve_include_path ( string $filename ) : string|false

Resolve filename against the include path according to the same rules as fopen()/include.



The filename to resolve.

Return Values

Returns a string containing the resolved absolute filename, or false on failure.


Example #1 stream_resolve_include_path() example

Basic usage example.


The above example will output something similar to:

string(22) "/var/www/html/test.php"

add a note add a note

User Contributed Notes 4 notes

zelnaga at gmail dot com
6 years ago
In case you're running a version of PHP that doesn't have this function...

if (!function_exists('stream_resolve_include_path')) {
     * Resolve filename against the include path.
     * stream_resolve_include_path was introduced in PHP 5.3.2. This is kinda a PHP_Compat layer for those not using that version.
     * @param Integer $length
     * @return String
     * @access public
    function stream_resolve_include_path($filename)
        $paths = PATH_SEPARATOR == ':' ?
            preg_split('#(?<!phar):#', get_include_path()) :
            explode(PATH_SEPARATOR, get_include_path());
        foreach ($paths as $prefix) {
            $ds = substr($prefix, -1) == DIRECTORY_SEPARATOR ? '' : DIRECTORY_SEPARATOR;
            $file = $prefix . $ds . $filename;

            if (file_exists($file)) {
                return $file;

        return false;
tambet dot matiisen at gmail dot com
7 years ago
stream_resolve_include_path() seems to cache it's output. After I renamed a file, I had to restart Apache for stream_resolve_include_path() to not return non-existing file name. This was on Windows.
sebastian dot krebs at kingcrunch dot de
9 years ago
It really behaves like `include` and will only resolve the filename against the include-path, if the path is relative. It makes not much sense to resolve already absolute pathnames anyway.
kontakt at victorjonsson dot se
8 years ago
This seems to be a great alternative to file_exists.

if( file_exists(__DIR__.'/som-file.php') )

Goes way slower than:

if( stream_resolve_inlcude_path(__DIR__.'/som-file.php') !== false)
To Top