& 引用传值

    public function ko(){

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

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

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