简单教程
提交运行
代码编辑器：
<?php $age=array("11"=>"27","11a"=>"29","12a"=>"37","Bill"=>"35","Steve"=>"37","Peter"=>"43"); echo count($age),"<br/>"; unset($age["11"]); echo count($age),"<br/>"; echo '<p>PHP 基础教程 - 简单教程(www.twle.cn)</p>';
运行结果：