Substr逻辑函数

Question

我想问一下substr()函数。我有这样的密码：

<?php    
$word = 'diriku';
    $word2 = $word;
    //first condition
    if ( (substr($word,-3)=="kah") or (substr($word,-3)=="lah") or (substr($word,-3)=="pun") or (substr($word,-3)=="nya"))
{
    $word2 = substr($word,0,-3);
}
    //second condition
else if( (substr($word,-2)=="ku") or (substr($word,-2)=="mu") )
{
    $word2 = substr($word,-2);
}
    echo $word2;
    echo "<br />";
    echo $word;
?>

结果肯定是：，DIRI，，但我不知道为什么结果是，DIR，。我的观点是，substr是在第一个条件下剪掉的，尽管它是正确的还是错误的。

因此，任何人都知道如何将substr函数进行逻辑比较，因此，如果第一个条件为true，则它将传递else，如果cond为false，则它将继续执行，而不是始终为真。

很抱歉这么乱的解释..。我不知道怎么把它描述清楚。

Answer 1

 <?php
        $word = 'songsangkukah';
        $word2 = $word;

        if ( (substr($word,-3)=="kah") or (substr($word,-3)=="lah") or (substr($word,-3)=="pun") or (substr($word,-3)=="nya"))
        {
           $word2 = substr($word, 0 , -3);
        }

        if((substr($word2,-2)=="ku")or(substr($word2,-2)=="mu"))
        {
            $word2 = substr($word2 , 0 , -2);
        }

        echo $word2;
        echo "<br />";
        echo $word;
    ?>

这就是你要的。所需的输出。

Answer 2

请尝尝这个。

if ( (substr($word,-3)=="kah") or (substr($word,-3)=="lah") or (substr($word,-3)=="pun") or (substr($word,-3)=="nya"))

似乎你的第三个条件有什么问题)

Answer 3

请检查你的密码。

substr($word,-3=="pun"), 

// it should be 

(substr($word,-3)=="pun")