007——数组(七)通过回调函数得到数组交集或差集

<?php
/**
 *7.通过回调函数得到数组交集或差集
 */

/*array_udiff()比较2个或多个数组的差值，只比较值，不进行键名的比较
 * */
/*$array1 = array("a" => "a", "b" => 'b', "c" => "c1");
$array2 = array("a" => "a", "b" => 'b', "c" => "c");
function func($v1, $v2)
{
    if ($v1 === $v2){
        return 0;
    }elseif ($v1>$v2){
        return 1;
    }else{
        return -1;
    };
}
$array3 = array_udiff($array1, $array2, "func");
print_r($array3);//输出：Array ( [c] => c1 )*/

/*array_udiff_assoc() 通过回调函数，比较2个或多个数组的键名或键值的差值。
 * */
/*$array1 = array("a1" => "a", "b" => 'b1', "c" => "c");
$array2 = array("a" => "a", "b" => 'b', "c" => "c");
function fun1($v1,$v2){
    if ($v1 === $v2){
        return 0;
    }elseif ($v1>$v2){
        return 1;
    }else{
        return -1;
    };
}
$array3=array_udiff_assoc($array1,$array2,"fun1");
print_r($array3);//输出：Array ( [a1] => a [b] => b1 )*/

/*array_udiff_uassoc() 通过回调函数，比较多个数组的键名和键值，要定义2个回调函数来处理键名和键值的比较
 * */
/*$array1 = array("a1" => "a", "b" => 'b1', "c" => "c");
$array2 = array("a" => "a", "b" => 'b', "c" => "c");
function func_date($v1,$v2){
    if ($v1 === $v2){
        return 0;
    }elseif ($v1>$v2){
        return 1;
    }else{
        return -1;
    };
}

function func_key($v1,$v2){
    if ($v1 === $v2){
        return 0;
    }elseif ($v1>$v2){
        return 1;
    }else{
        return -1;
    };
}
$array3=array_udiff_uassoc($array1,$array2,"func_date","func_key");
print_r($array3);//输出：Array ( [a1] => a [b] => b1 )*/

/*array_uintersect() 得到多个数组中键值的交集，通过回调函数：
 * */
/*$array1 = array("a" => "a1", "b" => 'b1', "c" => "c");
$array2 = array("a" => "a1", "b" => 'b', "c" => "c");
function func5($v1, $v2)
{
    if ($v1 === $v2) {
        return 0;
    } elseif ($v1 >$v2) {
        return 1;
    } else {
        return -1;
    };
}

$array3 = array_uintersect($array1, $array2, "func5");
print_r($array3);//输出：Array ( [a] => a1 )*/

/*array_uintersect_assoc() 得到多个数组中的键值的交集，通过函数，键名也参与比较
 * */
/*$array1 = array("a" => "a", "b" => 'b1', "c" => "c");
$array2 = array("a" => "a", "b" => 'b', "c1" => "c");
function func6($v1, $v2)
{
    if ($v1 === $v2) {
        return 0;
    } elseif ($v1 > $v2) {
        return 1;
    } else {
        return -1;
    };
}

$array3 = array_uintersect_assoc($array1, $array2, "func6");
print_r($array3);//输出：Array ( [a] => a )*/


/*array_uintersect_uassoc()  通过2个回调函数，对多个数组的键名和键值进行比较，得到多个数组的交集元素。
 * */
$array1 = array("a" => "a", "b" => 'b1', "c" => "c");
$array2 = array("a" => "a", "b" => 'b', "c1" => "c");
function func_data($v1, $v2)
{
    if ($v1 === $v2) {
        return 0;
    } elseif ($v1 > $v2) {
        return 1;
    } else {
        return -1;
    };
}
function func_key($v1, $v2)
{
    if ($v1 === $v2) {
        return 0;
    } elseif ($v1 > $v2) {
        return 1;
    } else {
        return -1;
    };
}
$array3 = array_uintersect_uassoc($array1, $array2, "func_data","func_key");
print_r($array3);//输出：Array ( [a] => a )