Question

How to use closure as callback functions in PHP

Answer 1

//  closure
$double = function($n) {
    return $n * 3;
};
 
// range of numbers
$numbers = range(1, 6);
 
// use closure as a callback 
$calculate_numbers = array_map($double, $numbers);
 
print implode(' ', $calculate_numbers);
 
  
/*
run: 
 
3 6 9 12 15 18
 
*/

 

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Answer 2

//  closure
$double = function($n) {
    return $n * 3;
};
 
// range of numbers
$numbers = range(1, 6);
 
// use closure as a callback 
$calculate_numbers = array_map($double, $numbers);
 
echo "<pre>";
print_r($calculate_numbers);
echo "</pre>";
 

  
/*
run: 
 
Array
(
    [0] => 3
    [1] => 6
    [2] => 9
    [3] => 12
    [4] => 15
    [5] => 18
)
 
*/

 

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