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  • array_uintersect()

    (PHP 5, PHP 7)

    计算数组的交集,用回调函数比较数据

    说明

    array_uintersect(array $array1,array $array2[,array $...],callable$value_compare_func): array

    array_uintersect()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。数据比较是用回调函数进行的。此比较是通过用户提供的回调函数来进行的。如果认为第一个参数小于,等于,或大于第二个参数时必须分别返回一个小于零,等于零,或大于零的整数。

    参数

    $array1

    第一个数组。

    $array2

    第二个数组。

    $value_compare_func

    在第一个参数小于,等于或大于第二个参数时,该比较函数必须相应地返回一个小于,等于或大于 0 的整数。

    callback(mixed $a,mixed $b): int

    返回值

    Returns an array containing all the values of$array1that are present in all the arguments.

    范例

    Example #1array_uintersect()例子

    <?php
    $array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
    $array2 = array("a" => "GREEN", "B" => "brown", "yellow", "red");
    print_r(array_uintersect($array1, $array2, "strcasecmp"));
    ?>
    

    以上例程会输出:

    Array
    (
        [a] => green
        [b] => brown
        [0] => red
    )
    

    参见

    I want to stress that in the user function, you do need to return either a 1 or a -1 properly; you cannot simply return 0 if the results are equal and 1 if they are not. 
    The following code is incorrect:
    <?php
    function myfunction($v1,$v2) 
    {
    if ($v1===$v2)
      {
      return 0;
      }
    return 1;
    }
    $a1=array(1, 2, 4);
    $a2=array(1, 3, 4);
    print_r(array_uintersect($a1,$a2,"myfunction"));
    ?>
    This code is correct:
    <?php
    function myfunction($v1,$v2) 
    {
    if ($v1===$v2)
      {
      return 0;
      }
    if ($v1 > $v2) return 1;
    return -1;
    }
    $a1=array(1, 2, 4);
    $a2=array(1, 3, 4);
    print_r(array_uintersect($a1,$a2,"myfunction"));
    ?>
    
    When trying to do a case insensitive comparison between arrays of words, the strcasecmp function works very nicely with this one like so: 
    $arr1 = array('blue', 'green', 'red');
    $arr2 = array('BLUE', 'Purple', 'Red');
    $loose_matches = array_uintersect($arr1, $arr2, 'strcasecmp');
    print_r($loose_matches) // array('blue', 'red');
    As for the other "compare function" callbacks, the return value from the callback function doesn't need to be -1, 0, or 1.
    cmp($a,$b) just needs to be <0, =0, or >0 depending on whether $a<$b, $a=$b, or $a>$b.