What is the purpose of using parse_url() function in PHP and how does it relate to the error message mentioned?

The purpose of using the `parse_url()` function in PHP is to parse a URL and return its components like scheme, host, path, etc. The error message mentioned could be related to trying to access an array key that does not exist when using `parse_url()`, which can lead to a "Undefined index" error. To solve this issue, you should always check if the array key exists before trying to access it. 

$url = "https://www.example.com";
$parsed_url = parse_url($url);

if(isset($parsed_url['host'])){
    // Access the 'host' key safely
    echo $parsed_url['host'];
} else {
    echo "Host key does not exist";
}

Keywords

parse_url PHP function URL parsing error message relate

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