   #PHP Manual Array Functions array_intersect_assoc array_key_exists

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                                array_intersect

   (PHP 4 >= 4.0.1)
   array_intersect -- Computes the intersection of arrays

Description

   array array_intersect ( array array1, array array2 [, array ...])

   array_intersect() returns an array containing all the values of array1
   that are present in all the arguments. Note that keys are preserved.

   Example 1. array_intersect() example
   <?php
   $array1 = array("a" => "green", "red", "blue");
   $array2 = array("b" => "green", "yellow", "red");
   $result = array_intersect($array1, $array2);
   ?>

   This makes $result have
   Array
   (
       [a] => green
       [0] => red
   )

     Note: Two elements are considered equal if and only if (string)
     $elem1 === (string) $elem2. In words: when the string
     representation is the same.

   See also array_intersect_assoc(), array_diff(), and
   array_diff_assoc().
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