PHP - Function array_filter()


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Syntax

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

Definition and Usage

Iterates over each value in the input array passing them to the callback function. If the callback function returns true, the current value from input is returned into the result array. Array keys are preserved.

Parameters

Parameter Description
input The array to iterate over
callback The callback function to use

If no callback is supplied, all entries of input equal to FALSE will be removed.

Return Values

Returns the filtered array.

Example

Try out following example −

<?php
   function odd($var)
   {
      return($var & 1);
   }
   
   function even($var)
   {
      return(!($var & 1));
   }
   
   $array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
   $array2 = array(6, 7, 8, 9, 10, 11, 12);
   
   echo "Odd :\n";
   print_r(array_filter($array1, "odd"));
   
   echo "Even:\n";
   print_r(array_filter($array2, "even"));
?> 

This will produce the following result −

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

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