& 引用传值

    public function ko(){

        $arr_1 = [
            ['name' => 'zhang0','sex' =>   0],
            ['name' => 'zhang1','sex' =>   1],
            ['name' => 'zhang2','sex' =>   0],
            ['name' => 'zhang3','sex' =>   1],
            ['name' => 'zhang4','sex' =>   0]
        ];

        $arr_2 = [
            ['name' => 'li0','sex' =>   0],
            ['name' => 'li1','sex' =>   1],
            ['name' => 'li2','sex' =>   0],
            ['name' => 'li4','sex' =>   0]
        ];

        foreach ($arr_1 as &$v){
            $v['sex_str'] = '男';
        }

        $result = $arr_1;
        foreach ($arr_2 as $v){
            $v['sex_str'] = '女';
        }

        dump($arr_1);
        dump($arr_2);
        dump($result);
        exit;
    }

<pre>array(5) {
[0] => array(3) {
["name"] => string(6) "zhang0"
["sex"] => int(0)
["sex_str"] => string(3) "男"
}
[1] => array(3) {
["name"] => string(6) "zhang1"
["sex"] => int(1)
["sex_str"] => string(3) "男"
}
[2] => array(3) {
["name"] => string(6) "zhang2"
["sex"] => int(0)
["sex_str"] => string(3) "男"
}
[3] => array(3) {
["name"] => string(6) "zhang3"
["sex"] => int(1)
["sex_str"] => string(3) "男"
}
[4] => &array(3) {
["name"] => string(3) "li4"
["sex"] => int(0)
["sex_str"] => string(3) "女"
}
}
</pre><pre>array(4) {
[0] => array(2) {
["name"] => string(3) "li0"
["sex"] => int(0)
}
[1] => array(2) {
["name"] => string(3) "li1"
["sex"] => int(1)
}
[2] => array(2) {
["name"] => string(3) "li2"
["sex"] => int(0)
}
[3] => array(2) {
["name"] => string(3) "li4"
["sex"] => int(0)
}
}
</pre><pre>array(5) {
[0] => array(3) {
["name"] => string(6) "zhang0"
["sex"] => int(0)
["sex_str"] => string(3) "男"
}
[1] => array(3) {
["name"] => string(6) "zhang1"
["sex"] => int(1)
["sex_str"] => string(3) "男"
}
[2] => array(3) {
["name"] => string(6) "zhang2"
["sex"] => int(0)
["sex_str"] => string(3) "男"
}
[3] => array(3) {
["name"] => string(6) "zhang3"
["sex"] => int(1)
["sex_str"] => string(3) "男"
}
[4] => &array(3) {
["name"] => string(3) "li4"
["sex"] => int(0)
["sex_str"] => string(3) "女"
}
}
</pre>

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