md5_file - PHP code example

PHP Function MD5_File

PHP md5_file function is an inbuilt function that can be used to generate md5 hash of a file. It can be called by passing in the file path as the argument. This article will explain the syntax and use of md5_file function.

The md5() function takes a string as input and applies a series of mathematical operations to it, ultimately producing a unique hexadecimal hash value. This value is then returned as the output of the function. It’s commonly used for checksum verification, data integrity checks, and simple data encryption.

While this function is useful for many purposes, it’s not recommended for use with security-sensitive tasks like password hashing. This is because MD5 is vulnerable to collision attacks that can result in the same hexadecimal value for two different input strings. However, the solution to this problem is a process known as salting, which involves appending random values to the original data before it’s hashed. This prevents two identical input strings from generating the same hexadecimal value and mitigates some of the risks associated with precomputed attacks.

Unlike the md5() function, which returns the hexadecimal hash as string output, the md5_file() function can optionally return a raw binary format of 16-character length. This is enabled by setting the $raw_output option to TRUE, and defaults to FALSE. This can be useful if you need to print out the hash value of a file, and it may also be faster if you have a file with an encoding that’s not UTF-8.

md5_file example

public function __construct(string $htaccessPath)
    {
        $this->htaccessPath = $htaccessPath;
    }

    public function update(): void
    {
        if (!file_exists($this->htaccessPath) || !file_exists($this->htaccessPath . self::TEMPLATE_SUFFIX)) {
            return;
        }

        if (\in_array(md5_file($this->htaccessPath), self::OLD_FILES, true)) {
            $this->replaceFile($this->htaccessPath);

            return;
        }

        $content = file_get_contents($this->htaccessPath);

        // User has deleted the markers. So we will ignore the update process         if (strpos($content, self::MARKER_START) === false || strpos($content, self::MARKER_STOP) === false) {
            return;
        }

return new WP_Error(
                'rest_upload_no_data',
                __( 'No data supplied.' ),
                array( 'status' => 400 )
            );
        }

        // Verify hash, if given.         if ( ! empty( $headers['content_md5'] ) ) {
            $content_md5 = array_shift( $headers['content_md5'] );
            $expected    = trim( $content_md5 );
            $actual      = md5_file( $files['file']['tmp_name'] );

            if ( $expected !== $actual ) {
                return new WP_Error(
                    'rest_upload_hash_mismatch',
                    __( 'Content hash did not match expected.' ),
                    array( 'status' => 412 )
                );
            }
        }

        // Pass off to WP to handle the actual upload.

function verify_file_md5( $filename, $expected_md5 ) {
    if ( 32 === strlen( $expected_md5 ) ) {
        $expected_raw_md5 = pack( 'H*', $expected_md5 );
    } elseif ( 24 === strlen( $expected_md5 ) ) {
        $expected_raw_md5 = base64_decode( $expected_md5 );
    } else {
        return false; // Unknown format.     }

    $file_md5 = md5_file( $filename, true );

    if ( $file_md5 === $expected_raw_md5 ) {
        return true;
    }

    return new WP_Error(
        'md5_mismatch',
        sprintf(
            /* translators: 1: File checksum, 2: Expected checksum value. */
            __( 'The checksum of the file (%1$s) does not match the expected checksum value (%2$s).' ),
            bin2hex( $file_md5 ),

$checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );

        if ( ! is_array( $checksums ) ) {
            return false;
        }

        foreach ( $checksums as $file => $checksum ) {
            // Skip files which get updated.             if ( str_starts_with( $file, 'wp-content' ) ) {
                continue;
            }
            if ( ! file_exists( ABSPATH . $file ) || md5_file( ABSPATH . $file ) !== $checksum ) {
                return false;
            }
        }

        return true;
    }
}

return [
            UpdatePostFinishEvent::class => 'update',
        ];
    }

    public function update(): void
    {
        if (!file_exists($this->htaccessPath) || !file_exists($this->htaccessPath . '.dist')) {
            return;
        }

        if (\in_array(md5_file($this->htaccessPath), self::OLD_FILES, true)) {
            $this->replaceFile($this->htaccessPath);

            return;
        }

        $content = file_get_contents($this->htaccessPath);

        // User has deleted the markers. So we will ignore the update process         if (!$content || !str_contains($content, self::MARKER_START) || !str_contains($content, self::MARKER_STOP)) {
            return;
        }

}

if (! function_exists('same_file')) {
    /** * Checks if two files both exist and have identical hashes * * @return bool Same or not */
    function same_file(string $file1, string $file2): bool
    {
        return is_file($file1) && is_file($file2) && md5_file($file1) === md5_file($file2);
    }
}

if (! function_exists('set_realpath')) {
    /** * Set Realpath * * @param bool $checkExistence Checks to see if the path exists */
    function set_realpath(string $path, bool $checkExistence = false): string
    {

throw FrameworkException::forInvalidDirectory($path);
        }

        $directory = new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS);
        $filter    = new IteratorFilter($directory);
        $iterator  = new RecursiveIteratorIterator($filter);

        $hashes = [];

        foreach ($iterator as $file) {
            if ($file->isFile()) {
                $hashes[] = md5_file($file->getRealPath());
            }
        }

        return md5(implode('', $hashes));
    }
}

if (!empty($VorbisCommentError)) {

                    $this->warning('Failed making system call to vorbiscomment(.exe) - '.$algorithm.'_data will be incorrect. If vorbiscomment is unavailable, please download from http://www.vorbis.com/download.psp and put in the getID3() directory. Error returned: '.$VorbisCommentError);
                    $this->info[$algorithm.'_data'] = false;

                } else {

                    // Get hash of newly created file                     switch ($algorithm) {
                        case 'md5':
                            $this->info[$algorithm.'_data'] = md5_file($temp);
                            break;

                        case 'sha1':
                            $this->info[$algorithm.'_data'] = sha1_file($temp);
                            break;
                    }
                }

                // Clean up                 unlink($empty);
                unlink($temp);

foreach ($md5Sums as $row) {
            list($expectedMd5Sum, $file) = explode(' ', trim($row));

            if (\in_array($file, $this->skipList)) {
                continue;
            }

            $fileAvailable = is_file($baseDir . $file);

            $md5SumMatch = false;
            if ($fileAvailable) {
                $md5Sum = md5_file($baseDir . $file);
                $md5SumMatch = $md5Sum === $expectedMd5Sum;
            }

            if ($md5SumMatch) {
                $good[] = [
                    'name' => $file,
                    'available' => $fileAvailable,
                    'result' => $md5SumMatch,
                ];
            } else {
                $bad[] = [

mkdir($prevCacheDir, 0777, true);
        $absoluteCacheDir = realpath($prevCacheDir);
    }
    if ($absoluteCacheDir) {
        putenv("COMPOSER_CACHE_DIR=$absoluteCacheDir");
    } else {
        $prevCacheDir = false;
    }
}
$SYMFONY_PHPUNIT_REMOVE = $getEnvVar('SYMFONY_PHPUNIT_REMOVE', 'phpspec/prophecy'.($PHPUNIT_VERSION < 6.0 ? ' symfony/yaml' : ''));
$SYMFONY_PHPUNIT_REQUIRE = $getEnvVar('SYMFONY_PHPUNIT_REQUIRE', '');
$configurationHash = md5(implode(\PHP_EOL, [md5_file(__FILE__), $SYMFONY_PHPUNIT_REMOVE, $SYMFONY_PHPUNIT_REQUIRE, (int) $PHPUNIT_REMOVE_RETURN_TYPEHINT]));
$PHPUNIT_VERSION_DIR = sprintf('phpunit-%s-%d', $PHPUNIT_VERSION, $PHPUNIT_REMOVE_RETURN_TYPEHINT);
if (!file_exists("$PHPUNIT_DIR/$PHPUNIT_VERSION_DIR/phpunit") || $configurationHash !== @file_get_contents("$PHPUNIT_DIR/.$PHPUNIT_VERSION_DIR.md5")) {
    // Build a standalone phpunit without symfony/yaml nor prophecy by default
    @mkdir($PHPUNIT_DIR, 0777, true);
    chdir($PHPUNIT_DIR);
    if (file_exists("$PHPUNIT_VERSION_DIR")) {
        passthru(sprintf('\\' === \DIRECTORY_SEPARATOR ? 'rmdir /S /Q %s 2> NUL' : 'rm -rf %s', escapeshellarg("$PHPUNIT_VERSION_DIR.old")));
        rename("$PHPUNIT_VERSION_DIR", "$PHPUNIT_VERSION_DIR.old");
        passthru(sprintf('\\' === \DIRECTORY_SEPARATOR ? 'rmdir /S /Q %s' : 'rm -rf %s', escapeshellarg("$PHPUNIT_VERSION_DIR.old")));
    }

if ( ! file_exists( $working_dir_local . $file ) ) {
                    continue;
                }

                if ( '.' === dirname( $file )
                    && in_array( pathinfo( $file, PATHINFO_EXTENSION ), array( 'html', 'txt' ), true )
                ) {
                    continue;
                }

                if ( md5_file( ABSPATH . $file ) === $checksum ) {
                    $skip[] = $file;
                } else {
                    $check_is_writable[ $file ] = ABSPATH . $file;
                }
            }
        }
    }

    // If we're using the direct method, we can predict write failures that are due to permissions.     if ( $check_is_writable && 'direct' === $wp_filesystem->method ) {
        $files_writable = array_filter( $check_is_writable, array( $wp_filesystem, 'is_writable' ) );

  private static function flushAlteredCodeToFile(string $file_name, string $altered_code): string {
    $directory = __DIR__ . '/../../../../../sites/simpletest';
    $full_path = $directory . '/' . $file_name;

    // Only write when necessary.     if (!file_exists($full_path) || md5_file($full_path) !== md5($altered_code)) {
      // Create directory when necessary.       if (!is_dir($directory) && !@mkdir($directory, 0777, TRUE) && !is_dir($directory)) {
        throw new \RuntimeException('Unable to create directory: ' . $directory);
      }
      file_put_contents($full_path, $altered_code);
    }

    return $full_path;
  }

}

/** * Allows to set different configurations for the less compiler, * like the compress mode or css source maps. */
    public function setConfiguration(array $configuration)
    {
        $this->compiler->SetOptions($configuration);
        $this->compiler->registerFunction('swhash', function DLess_Tree_Quoted $filename) {
            $absPath = $filename->currentFileInfo['currentDirectory'] . $filename->value;
            $shopwareRevision = $this->compiler->findValueOf('shopware-revision');
            $filename->value = md5($shopwareRevision . md5_file($absPath));

            return $filename;
        });
    }

    /** * Allows to define import directories for the less compiler. */
    public function setImportDirectories(array $directories)
    {
        $this->compiler->SetImportDirs($directories);
    }