Unknown Named Parameter / Extra Arguments

Why This Happens

Some PHP functions accept a fixed number of parameters. When you pass extra arguments, PHP throws an ArgumentCountError. This is common when confusing similar functions that take different numbers of parameters or when copy-pasting code with incorrect arguments.

The Problem

$cleaned = trim($input, ' ', '\n'); // trim only takes 2 arguments

The Fix

$cleaned = trim($input, " \n"); // Characters combined in one string

Step-by-Step Fix

1. 1

   Check the function documentation

   Look up the function in the PHP manual to see its exact signature and how many parameters it accepts.

2. 2

   Fix the argument list

   Remove extra arguments or combine them as the function expects. For trim(), multiple strip characters go in one string parameter.

3. 3

   Use the right function

   If you need different behavior, you may need a different function. Check if there is a variant that accepts the arguments you want to pass.