PHP two-dimensional associative array traversal method

The foreach loop is used to traverse the two-dimensional index array, which is relatively faster and more efficient. The foreach loop is specially used to loop arrays in PHP.
The examples are relatively simple, just practice more and think clearly about the program running logic.

<?php
	$arr = array(//定义外层数组
    "北京负责人"=>array(1,&#39;高某&#39;,&#39;A公司&#39;,&#39;北京市&#39;,&#39;(010)987654321&#39;,&#39;gm@Linux.com&#39;),//子数组1
    "上海负责人"=>array(2,&#39;洛某&#39;,&#39;B公司&#39;,&#39;上海市&#39;,&#39;(021)123456789&#39;,&#39;lm@apache.com&#39;),//子数组2
    "天津负责人"=>array(3,&#39;峰某&#39;,&#39;C公司&#39;,&#39;天津市&#39;,&#39;(022)24680246&#39;,&#39;fm@mysql.com&#39;),  //子数组3
    "重庆负责人"=>array(4,&#39;书某&#39;,&#39;D公司&#39;,&#39;重庆市&#39;,&#39;(023)13579135&#39;,&#39;sm@php.com&#39;)     //子数组4
    );

	foreach($arr as $key=>$arr_item){
		echo $key;	//取出数组的键
		echo "<pre class="brush:php;toolbar:false">";
			print_r($arr_item);	//$arr_item就是子数组了
		echo "

"; foreach($arr_item as $value){ echo $value."==="; //数组的值 } } ?>

Summary:
1. When traversing a two-dimensional associative array, the for loop may not be used.
2. $key, take out the key of $arr array
3. $arr_item is the subarray (subarray 1, subarray 2...)

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