What is the difference between array_walk and array_map when it comes to trimming whitespace in PHP?

When it comes to trimming whitespace in PHP, the main difference between `array_walk` and `array_map` is that `array_walk` modifies the original array in place, while `array_map` creates a new array with the modified values. If you want to trim whitespace from all elements in an array without creating a new array, you should use `array_walk`. On the other hand, if you want to keep the original array intact and create a new array with trimmed values, you should use `array_map`. 

// Using array_walk to trim whitespace in the original array
$array = ['  hello ', '  world  '];
array_walk($array, function (&$value) {
    $value = trim($value);
});
print_r($array);

Keywords

array_walk array_map trimming whitespace PHP

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