php多个一维数组合并成二维数组

<?php
$a= array("张三","李四","王五");

 $b= array ("23","24","25");

 $c= array ("北京","上海","广州" );
 foreach($a as $key=>$val){

  $d[$key]["姓名"]=$a[$key];


  $d[$key]["年龄"]=$b[$key];


  $d[$key]["城市"]=$c[$key];

 }


 var_dump($d);
?> 

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