How to map array elements in PHP?

To create a new array from an existing PHP array, you can use the array_map(functionName, array1, array2, ...) function. The array_map() function iterates over all the elements of an array and returns a new array containing the results of applying the given callback function to the array elements. The array_map() function does not change the specified array but returns a new one. You can pass several arrays to the array_map() function. The number of parameters the callback function takes must match the number of arrays passed to the array_map(). The first parameter is the name of a user-defined callback function applied to all elements of the array. The second parameter specifies the array to process. In this PHP map array element example, we use the array_map() function to loop over an array and return a new array, where a callback function has been applied to each element in the array. Click Execute to run the PHP Array Map Example online and see the result.
How to map array elements in PHP? Execute
<?php
function func($v)
{
  return($v * 2);
}

$array = array(1, 2, 3, 4, 5);

print_r(array_map("func",$array));
?>
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How to use the array_map function in PHP?

Following is the syntax of the array_map() function:

PHP array_map() Syntax
array_map(functionName, array1, array2, array3 ...)

Where:
  • functionName: the required parameter that defines the name of the user-defined callback function applied to all elements of the array
  • array1: the required parameter that specifies the array to process
  • array2, array3 (optional): additional arrays to pass to the callback function
PHP Map Array Example
<?php
function func($v)
{
  return($v * 2);
}

$array = array(5, 4, 2, 2, 3);

print_r(array_map("func",$array));
?>

#output: Array
(
    [0] => 10
    [1] => 8
    [2] => 4
    [3] => 4
    [4] => 6
)

See also