Function and usage of path_join() in wordpress

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    2024-01-08T20:06:16+00:00

    The path_join() function in WordPress is used to concatenate two filesystem paths. Here's a detailed explanation of its function and usage:

    Function:

    • Name: path_join()
    • Purpose: To join two filesystem paths together.

    Description:

    • The path_join() function is designed to create a single path by joining two separate path strings.
    • This function is particularly useful when you need to create a path that is relative to a certain base path.
    • It checks if the second path $path is an absolute path. If so, it returns the absolute path as is.
    • If $path is not absolute, it joins it with the $base path to create a new path.

    Parameters:

    1. $base (string, required):

      • This is the base path.
      • It acts as the starting point or root directory to which the second path will be appended.
    2. $path (string, required):

      • This is the path that you want to append to the base path.
      • If this path is an absolute path, it will be returned as is, ignoring the base path.

    Return:

    • Type: string
    • Description: The function returns the combined path. If $path is absolute, it returns $path; otherwise, it returns the combined path of $base and $path.

    Sample Usage:

    <?php
    $base = '/var/www/html';
    $path = 'wp-content/themes';
    
    $full_path = path_join($base, $path);
    
    echo $full_path; // Outputs: /var/www/html/wp-content/themes
    ?>
    

    In this example, $base is the root directory, and $path is the directory inside the root that we want to access. The path_join() function combines these two to create a full path to the themes directory of a WordPress installation.

    Usage with Absolute Path:

    <?php
    $base = '/var/www/html';
    $path = '/usr/local/bin';
    
    $full_path = path_join($base, $path);
    
    echo $full_path; // Outputs: /usr/local/bin
    ?>
    

    In this case, since $path is an absolute path, the function simply returns $path, ignoring the $base path.

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