Code WORKFLOW:
In the code provided, the $callback parameter of the user_defined_array_filter function has a default value of null. This means that if no callback is provided when calling the function, $callback will be null.
The foreach loop iterates through the $array, and within the loop, there is an if ($callback) condition. This condition checks whether a callback function was provided. Here's a step-by-step explanation of how this works:
Here, user_defined_array_filter is called with the array $numbers and the callback function 'is_even'.
- The $callback parameter is set to 'is_even', so the condition if ($callback) evaluates to true.
- The call_user_func($callback, $value) function call invokes the is_even function with each element of the array.
- Only the elements for which is_even returns true are included in the $result array.
- user_defined_array_filter($numbers, 'is_even'):
- $callback is 'is_even'.
- if ($callback) is true.
- call_user_func($callback, $value) calls is_even($value) for each value.
- The result is [2, 4, 6, 8, 10].
Негізгі бет Create Your Own PHP array_filter: Step-by-Step Guide | Building a User-Defined array_filter in PHP
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