PHP interview

01 输入open_door 返回 OpenDoor

<?php

    $str = "open_door";
    $arr = explode('_',$str);

    foreach($arr as $v)
    {
        $new = ucwords($v);
        $ret .= $new;
    }

    echo $ret;
    ?>

02 反转字符串

<?php
    function revstr($str){

        $len = strlen($str);
        for ($i = $len; $i>= 0; $i--){
            $ret .= $str[$i];
        }

        return $ret;
    }


    $str = "abcdefg";
    echo revstr($str);
?>