PHP check if url parameter exists

To check if a URL parameter exists in PHP, you can use the isset function. This function returns a boolean value indicating whether a variable with the specified name has been set and is not NULL.

For example, if you want to check if a URL parameter called id exists, you can use the following code:

How to check if a URL parameter exists in PHP?

You can also use the array_key_exists function to check if a key exists in an array. This function can be used to check if a URL parameter exists in the $_GET array:

Example of checking if a URL parameter exists in PHP by using array_key_exists() function?