MD5 hash for a large file in PHP

md5_file_large.php

<?php
function md5_file_large($file_path) {
    if (!file_exists($file_path)) {
        return false;
    }

    $chunk_size = 1024 * 1024; // 1MB
    $md5_hash = hash_init('md5');

    $file = fopen($file_path, 'rb');
    if ($file === false) {
        return false;
    }

    while (!feof($file)) {
        $buffer = fread($file, $chunk_size);
        hash_update($md5_hash, $buffer);
    }

    fclose($file);

    return hash_final($md5_hash);
}