Which of the following is the correct syntax to use array_walk with a callback function named modify on an array $arr?

easy📝 Syntax Q12 of 15

PHP - Array Functions

Which of the following is the correct syntax to use array_walk with a callback function named modify on an array $arr?

Aarray_walk('modify', $arr);

Barray_walk(modify, $arr);

Carray_walk($arr, modify);

Darray_walk($arr, 'modify');

Step-by-Step Solution

Solution:

Step 1: Recall array_walk syntax
The correct syntax is array_walk(array, callback), where callback is a string with the function name.
Step 2: Check the options
Only array_walk($arr, 'modify'); matches the correct order and uses quotes around the callback function name.
Final Answer:
array_walk($arr, 'modify'); -> Option D
Quick Check:
array_walk(array, 'function') syntax [OK]

Quick Trick: array_walk takes array first, then callback as string [OK]

Common Mistakes:

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