PHP Case Insensitive Version of file_exists()

Question

I\'m trying to think of the fastest way to implement a case insensitive file_exists function in PHP. Is my best bet to enumerate the file in the directory and do a strtolowe

Answer 1

My tuned solution, OS independent, case-insensitive realpath() alternative, covering whole path, named realpathi():

/**
 * Case-insensitive realpath()
 * @param string $path
 * @return string|false
 */
function realpathi($path)
{
    $me = __METHOD__;

    $path = rtrim(preg_replace('#[/\\\\]+#', DIRECTORY_SEPARATOR, $path), DIRECTORY_SEPARATOR);
    $realPath = realpath($path);
    if ($realPath !== false) {
        return $realPath;
    }

    $dir = dirname($path);
    if ($dir === $path) {
        return false;
    }
    $dir = $me($dir);
    if ($dir === false) {
        return false;
    }

    $search = strtolower(basename($path));
    $pattern = '';
    for ($pos = 0; $pos < strlen($search); $pos++) {
        $pattern .= sprintf('[%s%s]', $search[$pos], strtoupper($search[$pos]));
    }
    return current(glob($dir . DIRECTORY_SEPARATOR . $pattern));
}

search filename with glob [nN][aA][mM][eE] pattern seems to be the faster solution