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or运算符应该如何使用

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Jun 06, 2016 pm 08:23 PM

php

这段代码不知道为什么是错的：

<code>    if($lonpos!='E'or $lonpos!='W'){
        echo 'Wrong Lonpos<br>';
    }</code>

求解~谢谢

回复内容：

这段代码不知道为什么是错的：

<code>    if($lonpos!='E'or $lonpos!='W'){
        echo 'Wrong Lonpos<br>';
    }</code>

求解~谢谢

虽然不知道你指的「错」是什么，不过这个 if 确实不太对。

毕竟 $lonpos != 'E' 和 $lonpos != 'W' 至少有一个成立。所以 $lonpos!='E'or $lonpos!='W' 永远为真。

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