请教 PHP array_intersect() 函数用法

[peizhao2017]

<?php

$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");

$a2=array("e"=>"red","f"=>"black","g"=>"purple");

$a3=array("a"=>"red","b"=>"black","h"=>"yellow");


$result=array_intersect($a1,$a2,$a3);

print_r($result);

?>


官方教程里 array_intersect 里手工指定 $a1,$a2,$a3


怎么样动态的向 array_intersect 里面传参数呢

[Snail233]

什么动态不动态的，你直接传不就行了。。。array_intersect([],[])

[liyaoo]

动态个数？

[peizhao2017]

@liyaoo
对对，array_intersect 里面的数组数量是变化的，要怎么传进去

[zsdroid]

$arr = [
$arr1,
$arr2,
$arr3,
//...
];
$arr[] = $arr4;
$arr[] = $arr5;
call_user_func_array('array_intersect',$arr);

[ccliuxy]

array_intersect(...$set)

[peizhao2017]

@zsdroid 谢谢，回调函数吗


@ccliuxy 大神没看懂

[vescape920]

4L 和 5L 正解
PHP5.6 以下可以使用`call_user_func_array('array_intersect',$arr);`
PHP5.6+ 可以使用 array_intersect(...$set)

[ccliuxy]

@peizhao2017
```
$a = array('qqq','rrr','www');
$b = array('www','ccc');
$c = array('bbb', 'www', 'ccc');
$set = array($a, $b, $c);
print_r(array_intersect(...$set));
```
文档在这里[https://www.php.net/manual/zh/functions.arguments.php#functions.variable-arg-list]( https://www.php.net/manual/zh/functions.arguments.php#functions.variable-arg-list)

[peizhao2017]

感谢各位