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PHP: array_diff() function

PHP: Computes the difference of arrays

The array_diff() function is used to compares an array against one or more other arrays and returns the values in the first array that are not present in any of the other arrays.

Version:

(PHP 4 and above)

Syntax:

array_diff(array1, array2, array3 ...)

Parameter:

Name Description Required /
Optional		 Type
array1 The specified array which will be compared with other arrays. Required Array
array2 Compared with the first array. Required Array
array3 Compared with the first array. Optional Array

Return value:

An array containing all the entries from array1 whose values are not present in any of the other arrays i.e. array2, array3 etc.

Value Type: Array

Example:

<?php
$array1 = array(0=> 'Language', 1=>'Math', 2=>'Science', 3=>'Geography');
$array2 = array(0=> 'Math', 1=>'Science', 2=>'History');
$diff_result = array_diff($array1, $array2);
print_r($diff_result);
?>

Output: 

Array ( [0] => Language [3] => Geography)

Pictorial Presentation:

php function reference: array_diff() function

View the example in the browser

Practice here online:

See also

PHP Function Reference

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Next: array_fill



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PHP: Tips of the Day

Filters the collection using the given callback

Example:

<?php
function tips_reject($items, $func)
{
  return array_values(array_diff($items, array_filter($items, $func)));
}

print_r(tips_reject(['Apple', 'Pear', 'Kiwi', 'Banana'], function ($item) {
  return strlen($item) > 4;
}));
?>

Output:

Array
(
    [0] => Pear
    [1] => Kiwi
)