数组 函数
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array_intersect_assoc

(PHP 4 >= 4.3.0, PHP 5)

array_intersect_assoc — 带索引检查计算数组的交集

说明

array array_intersect_assoc ( array $array1 , array $array2 [, array $ ... ] )

array_intersect_assoc() 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。注意和 array_intersect() 不同的是键名也用于比较。

Example #1 array_intersect_assoc() 例子

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result_array = array_intersect_assoc($array1, $array2);
?>

$result_array 将是： 

Array
(
    [a] => green
)

上面例子中可以看到只有键值对 "a" => "green" 在两个数组中都存在从而被返回。值 "red" 没有被返回是因为在 $array1 中它的键名是 0 而在 $array2 中 "red" 的键名是 1。

键值对 key => value 中的两个值仅在 (string) $elem1 === (string) $elem2 时被认为相等。也就是说使用了严格检查，字符串的表达必须相同。

参见 array_intersect()，array_uintersect_assoc()，array_intersect_uassoc()，array_uintersect_uassoc()，array_diff() 和 array_diff_assoc()。

数组 函数
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PHP手册 - N: 带索引检查计算数组的交集

用户评论:

amoo_miki at yahoo dot com (17-Jul-2009 08:58)

A method to find intersection of two or more arrays when comparison is based only on keys

array_uintersect_assoc($array1  , $array2  [, $ array...  ], create_function(null, "return 0;"));

This returns an associative array containing all the keys in array1 that are present in all of the arguments.

asharm4 at ilstu dot edu (20-Apr-2006 05:20)

A function to find intersection of two arrays when comparison is based on only 1 key

function array_common($array1,$array2,$compareString) {
   if (!is_array($array1) || !is_array($array2)) {
       return false;
   }
   $arrResult = array();
   foreach ($array1 as $arrInsideArray1) {
       foreach ($array2 as $arrInsideArray2) {
           $found=false;
           if ($arrInsideArray1[$compareString]==$arrInsideArray2[$compareString]) {
               $found=true;
               break;
           }
       }
       if ($found) {
           array_push($arrResult,$arrInsideArray1);
       }

   }
   return $arrResult;
}

StR: str at strgt dot cjb dot net (14-Oct-2005 01:34)

To find the keys that are in 2 arrays, without caring of the values:

This is a function i needed, and it also returns the values of the first array

<?php
function array_key_intersect(&$a, &$b) {
  $array = array();
  while (list($key,$value) = each($a)) {
    if (isset($b[$key]))
      $array[$key] = $value;
  }
  return $array;
}
?>

vandor at progressive dot hu (14-Dec-2004 07:26)

# ket tomb kulcs alapu metszetet szamitja ki, az erteken is ellenorzest vegez
#
# calculating (key base) intersection of arrays (value are checked)
# use: $result_array = array_intersect_assoc($a1, $a2, $a3,..);
#
##
# original code by [jochem at iamjochem dawt com] : array_diff_keys()

<?php
function array_intersect_assoc() {

    $args = func_get_args();
    $res = $args[0];

    for ($i=1;$i<count($args);$i++) {
        if (!is_array($args[$i])) {continue;}

        foreach ($res as $key => $data) {
            if ( (!array_key_exists($key, $args[$i])) || ( (isset($args[$i][$key])) && ($args[$i][$key] !== $res[$key]) ) ) {
                unset($res[$key]);
            }
        }
    }

    return $res;
}

?>

<?php
$array1 = array("a"=>"green", "b"=>"brown", "c"=>"blue", "red");
$array2 = array("a"=>"green", "b"=>"yellow", "c"=>"yellow", "red");
$a = array('a'=>'green', 'b'=>'brown', 'c'=>'yellow');
$b = array('a'=>'green', 'b'=>'brown', 'c'=>'yellow', 'e'=>'yellow');

$result_array = array_intersect_assoc($a, $b, $array1, $array2);
?>

$args array will look like:

(
    0 =>
        (
            a => green
            b => brown
            c => yellow
        )

    1 =>
        (
            a => green
            b => brown
            c => yellow
            e => yellow
        )

    2 =>
        (
            a => green
            b => brown
            c => blue
            0 => red
        )

    3 =>
        (
            a => green
            b => yellow
            c => yellow
            0 => red
        )

)

$result_array will look like:

(
    a => green
)

nleippe at integr8ted dot com (12-Feb-2004 12:46)

A combination of the two functions [array_intersect() and array_intersect_assoc()] in order to obtain the intersection of two multidimensional arrays.

<?php
function array_intersect_assoc_recursive(&$arr1, &$arr2) {
    if (!is_array($arr1) || !is_array($arr2)) {
        return $arr1 == $arr2; // or === for strict type
    }
    $commonkeys = array_intersect(array_keys($arr1), array_keys($arr2));
    $ret = array();
    foreach ($commonkeys as $key) {
        $ret[$key] =& array_intersect_assoc_recursive($arr1[$key], $arr2[$key]);
    }
    return $ret;
}
?>