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PHP array_filter() Function

PHP array_filter() Function

Hello folks! welcome back to a new section of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP array_filter() Function.

The built-in array_filter() function in PHP iterates over each value in the input array and passing them to the callback function.


Following below is the syntax to use this function -

array array_filter ( array $input [, callback $callback] );

Parameter Details

Sr.NoParameter & Description


The array to iterate over



This a callback function to use

Return Value

It returns the filtered array.


Try out the below example -

   function odd($var) {
      return($var & 1);
   function even($var) {
      return(!($var & 1));
   $input1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
   $input2 = array(6, 7, 8, 9, 10, 11, 12);
   echo "Odd Values:\n";
   print_r(array_filter($input1, "odd"));
   echo "Even Values:\n";
   print_r(array_filter($input2, "even"));


When the above code is executed, it will produce the following result -

Odd Values:
Array (
   [a] => 1
   [c] => 3
   [e] => 5 
Even Values:
Array (
   [0] => 6 
   [2] => 8 
   [4] => 10 
   [6] => 12

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the PHP array_flip() Function.

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