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.

Syntax

Following below is the syntax to use this function -

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

READ: PHP array_fill() Function

Parameter Details

Sr.No	Parameter & Description
1	input The array to iterate over
2	callback This a callback function to use

Return Value

It returns the filtered array.

Example

Try out the below example -

<?php
   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"));
?> 

Output

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
)	

READ: PHP array_fill_keys() Function

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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