php substr（）根据起点和终点访问字符串

php substr（）

<?php

        $a="zhaogz@job@163.com";

        $email_array = explode('@',$a);

        echo $email_array[0];

        echo "<br>";

        echo $email_array[1];

        echo "<br>";

        echo $email_array[2];

        echo "<br>";

        $new_email = join ('@',$email_array);

        echo $new_email."<br />";

        $b = substr($new_email,0,6);  // 起点是0，终点是6(终点可不填，意思为到字符串终点为止)，读取字符串b为zhaogz

        echo $b."<br />";

        $c = substr($new_email,-7);  //负数为从右向左数，读取的字符串c为163.com

        echo $c;

?>