Function and usage of get_core_checksums() in wordpress

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    2024-01-06T19:57:26+00:00

    The get_core_checksums() function in WordPress is used to retrieve and cache the checksums for a specific version of WordPress. This is particularly useful for security and integrity checks, ensuring that the WordPress core files are as expected and have not been altered. Here's a detailed explanation of its functionality and parameters:

    1. Function Purpose:

      • Gets and Caches Checksums: It fetches the checksums for the given version of WordPress and stores them in cache. This means that subsequent calls for the same version will be faster as they can be served from cache.
      • Security and Integrity Checks: By comparing the checksums of the current WordPress files against those obtained from get_core_checksums(), one can determine if core files have been modified, potentially indicating a security breach.
    2. Parameters:

      • $version (string, required): This parameter specifies the version of WordPress for which you want to obtain checksums. It should be a string representing a valid WordPress version, like "5.7.2".
      • $locale (string, required): This defines the locale for which you want the checksums. WordPress might have different checksums for different locales due to translations and locale-specific content. The locale is typically a string like "en_US".
    3. Return Value:

      • The function returns an associative array of checksums on success. Each key in the array represents a file path relative to the base WordPress directory, and its value is a string representing the checksum of that file.
      • It returns false on failure, which might happen if invalid parameters are provided, or if checksums for the specified version and locale are not available.
    4. Sample Usage:

      • Imagine you want to get the checksums for WordPress version "5.8" and the locale "en_US". You would call the function like this: get_core_checksums("5.8", "en_US").
      • This call would return an array with file paths as keys and their checksums as values if successful. If it fails, it would return false.
    5. Practical Application:

      • A typical use case for this function would be in a WordPress security plugin or a maintenance script that periodically checks the integrity of WordPress core files.
    6. Caching Behavior:

      • The fetched checksums are cached to optimize performance. This caching behavior is particularly beneficial when running integrity checks regularly.

    By using get_core_checksums(), developers and administrators can ensure that the core files of their WordPress installation have not been tampered with, enhancing the overall security and integrity of their sites.

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