What are the potential pitfalls of writing custom functions that involve built-in PHP functions like get_meta_tags?

One potential pitfall of writing custom functions that involve built-in PHP functions like get_meta_tags is that the function may not handle errors or edge cases properly, leading to unexpected behavior or vulnerabilities in the code. To solve this, it is important to include proper error handling and validation checks in the custom function to ensure that the input is valid and the output is handled correctly.

function custom_get_meta_tags($url) {
    // Validate the input
    if (!filter_var($url, FILTER_VALIDATE_URL)) {
        return false;
    }
    
    // Get meta tags
    $meta_tags = get_meta_tags($url);
    
    // Handle errors or edge cases
    if (!$meta_tags) {
        return false;
    }
    
    return $meta_tags;
}