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array_intersect (PHP 4 >= 4.0.1, PHP 5) array_intersect -- 计算数组的交集 说明array array_intersect ( array array1, array array2 [, array ...])
array_intersect() 返回一个数组，该数组包含了所有在
array1 中也同时出现在所有其它参数数组中的值。注意键名保留不变。
例子 1. array_intersect() 例子 |
<?php
$array1 = array ("a" => "green", "red", "blue");
$array2 = array ("b" => "green", "yellow", "red");
$result = array_intersect ($array1, $array2);
?>
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这使得 $result 成为：
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Array
(
[a] => green
[0] => red
)
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注:
两个单元仅在 (string) $elem1 === (string) $elem2
时被认为是相同的。也就是说，当字符串的表达是一样的时候。
参见 array_intersect_assoc()，array_diff() 和
array_diff_assoc()。
david at audiogalaxy dot com
10-Apr-2001 07:54
Note that array_intersect() considers the type of the array elements when
it compares them.
If array_intersect() doesn't appear to be
working, check your inputs using var_dump() to make sure you're not trying
to intersect an array of integers with an array of strings.
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array_intersect_ukey
