Using WordPress ‘get_core_checksums()’ PHP function

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The get_core_checksums() WordPress PHP function retrieves and caches the checksums for a specified version of WordPress.

Usage

get_core_checksums( $version, $locale );

Example:

Input:

get_core_checksums('5.8', 'en_US');

Output: An array of the checksums for WordPress version 5.8 with locale ‘en_US’.

Parameters

  • $version (string) (Required): The version string of WordPress to query.
  • $locale (string) (Required): The locale string to query.

More information

See WordPress Developer Resources: get_core_checksums()

Examples

Verify WordPress Core Files

This code will compare the current WordPress core files with the original checksums to identify any file changes.

function verify_core_files() {
    $wp_version = get_bloginfo('version');
    $wp_locale = get_locale();

    $checksums = get_core_checksums($wp_version, $wp_locale);

    if (!$checksums) {
        echo "Could not retrieve checksums.";
        return;
    }

    $changed_files = array();

    foreach ($checksums as $file => $checksum) {
        $file_path = ABSPATH . $file;

        if (!file_exists($file_path)) {
            $changed_files[] = $file;
            continue;
        }

        $file_content = file_get_contents($file_path);
        if (md5($file_content) !== $checksum) {
            $changed_files[] = $file;
        }
    }

    if (empty($changed_files)) {
        echo "All core files are unchanged.";
    } else {
        echo "Changed core files:";
        echo implode(', ', $changed_files);
    }
}

verify_core_files();

Display WordPress Core Checksums

This code will display the checksums for the current WordPress version and locale.

function display_core_checksums() {
    $wp_version = get_bloginfo('version');
    $wp_locale = get_locale();

    $checksums = get_core_checksums($wp_version, $wp_locale);

    if (!$checksums) {
        echo "Could not retrieve checksums.";
        return;
    }

    foreach ($checksums as $file => $checksum) {
        echo "File: " . $file . " - Checksum: " . $checksum . "<br>";
    }
}

display_core_checksums();