Function and usage of insert_with_markers() in wordpress


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    The insert_with_markers() function in WordPress is a useful tool for modifying specific sections of a file, typically the .htaccess file, by inserting an array of strings or a single string between designated markers. This function is particularly important for dynamically updating configuration files without manually editing them. Below is a detailed explanation of its functionality and usage:


    • Purpose: insert_with_markers() is designed to insert an array of strings into a file, with .htaccess being a common target. This function is especially useful for programmatically updating configuration settings.
    • Operation: It places the new content between two markers, identified as "BEGIN" and "END" followed by the marker name. This approach ensures that the specified section of the file can be easily found and modified without impacting other parts of the file.


    • Behavior: The function replaces any existing information found within the specified markers while retaining all other data in the file. This means it can update specific sections without altering the rest of the file's content.
    • File Creation: If the target file does not exist, insert_with_markers() is capable of creating it.


    1. $filename (string, required): The name of the file you want to modify. In many WordPress applications, this is the .htaccess file.
    2. $marker (string, required): This is the specific marker or identifier that the function uses to locate where in the file to insert the new content. The content will be placed between "BEGIN" and "END" tags associated with this marker.
    3. $insertion (array|string, required): The new content to be inserted into the file. This can be either a single string or an array of strings, which will be inserted line by line.

    Return Value:

    • Type: Boolean (bool)
    • Description: The function returns true on successful write operations to the file, and false on failure.

    Sample Usage:

    Here's an example of how insert_with_markers() might be used in a WordPress context:

    $filename = ABSPATH . '.htaccess'; // Path to the .htaccess file
    $marker = 'CUSTOM_CONFIG';         // Custom marker
    $insertion = [
        'php_value upload_max_filesize 64M',
        'php_value post_max_size 64M',
        'php_value max_execution_time 300'
    ]; // New settings to insert
    $result = insert_with_markers($filename, $marker, $insertion);
    if ($result) {
        echo 'File updated successfully.';
    } else {
        echo 'File update failed.';

    In this example, the function is used to insert custom PHP settings into the .htaccess file. The $marker allows these settings to be easily updated or removed in the future by targeting the same marker again.

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