PHP replace in path

replace-in-path.php

<?php

$root = './src';
$find = 'foo';
$replace = 'bar';
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($root));
$count = 0;
foreach ($iterator as $file) {
    if ($file->isDir() || 'php' !== $file->getExtension() || '.' === $file->getFilename()[0]) {
        continue;
    }
    $path = $file->getRealPath();
    file_put_contents(
        $path,
        preg_replace(
            sprintf('/%s/', preg_quote($find, '/')),
            $replace,
            file_get_contents($path)
        )
    );
    ++$count;
}
echo "Replaced '$find' by '$replace' in $count files.\n";