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Arrays
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Manual: array_intersect
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  array_flip
  Updated
Mon, 12 Feb 2001
 array_keys 
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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.

Esempio 1. Array_intersect() example


$array1 = array ("a" => "green", "red", "blue");
$array2 = array ("b" => "green", "yellow", "red");
$result = array_intersect ($array1, $array2);

This makes $result have array ("a" => "green", "red");

See also array_diff().


User Contributed Notes: array_intersect

venaas@php.net
22-Oct-2000 06:06
Fixed now, will show up in 4.0.4

zeekamotay@hotmail.com
05-Dec-2000 10:38
There's no array_union() function, but you can do this:
array_unique(array_merge($array1,$array2))

xx@xx.com
19-Feb-2001 07:52
Here is the equivalent to array_intersect for PHP3 users :

function array_intersect($array1, $array2) {
if (sizeof($array1) > sizeof($array2)) {
$array3 = $array2;
$array2 = $array1;
$array1 = $array3;
}
$endarray = array (0 => 0);
$j = 0;
for ($i = 0; $i < sizeof($array1); $i++) {
if (in_array($array1[$i], $array2)){
$endarray[$j] = $array1 [$i];
$j++;
}
}
return ($endarray);
}

 About Notes

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