Function and usage of delete_metadata_by_mid() in wordpress


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    The delete_metadata_by_mid() function in WordPress is used to delete metadata entries based on their meta ID. This function is particularly useful when you need to remove a specific metadata entry without knowing its associated object ID. Here's a detailed explanation of the function and a sample usage:

    Function Definition:

    delete_metadata_by_mid( string $meta_type, int $meta_id ): bool


    1. $meta_type (string, required): This parameter specifies the type of object the metadata is associated with. It accepts standard WordPress object types like 'post', 'comment', 'term', and 'user'. Additionally, it can accept any other object type that has an associated metadata table. This parameter helps the function to determine which metadata table to target for the deletion operation.

    2. $meta_id (int, required): This is the ID of the specific meta row you want to delete. Each meta entry in WordPress has a unique ID, known as the meta ID, which is different from the object ID (like post ID or user ID) to which the meta data is related.

    3. Return Value (bool): The function returns a boolean value. It returns true if the deletion operation is successful, and false if it fails. This allows you to check if the operation was successful and handle errors accordingly.

    Sample Usage:

    Let's say you want to delete a specific metadata entry from a post. First, you need to know the meta ID of the metadata entry you want to delete. Once you have the meta ID, you can use the delete_metadata_by_mid() function as follows:

    $meta_type = 'post'; // Type of the object
    $meta_id = 123; // Assuming 123 is the meta ID you want to delete
    $result = delete_metadata_by_mid($meta_type, $meta_id);
    if ($result) {
        echo 'Metadata deleted successfully.';
    } else {
        echo 'Failed to delete metadata.';

    In this example, the delete_metadata_by_mid() function is used to delete the metadata entry with a meta ID of 123 associated with a post. The result of the deletion operation is stored in the $result variable, which is then checked to see if the operation was successful.

    Practical Considerations:

    • Use this function with caution, as deleting metadata cannot be undone.
    • It's important to ensure that the $meta_id you are targeting is correct to avoid unintentional data loss.
    • This function is useful in scenarios where metadata needs to be managed programmatically, like in custom plugins or themes.

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