[英]Comparing two strings with OR in PHP
I am trying to compare two strings and also I am using OR operator in PHP 我正在尝试比较两个字符串,而且我在PHP中使用OR运算符
Here is the Code: 这是代码:
<?php
$admintext= "Yes";
if(strcmp($admintext, 'Yes') != 0 or strcmp($admintext, 'No') != 0)
{
echo " Not perfect, Admin text doesn't have Yes OR No text";
}
else
{
echo " Perfect, Admin text has Yes or No";
}
?>
with the above code, I am always getting Not perfect, not sure why? 使用上面的代码,我总是越来越不完美,不确定为什么吗? What is wrong?
怎么了? - If I remove code after OR this work perfectly.
-如果在删除OR后删除代码,则效果很好。
Thanks! 谢谢!
You need to join the conditions with and
, nor or
: 您需要使用
and
,或or
来加入条件:
if (strcmp($admintext, 'Yes') != 0 and strcmp($admintext, 'No') != 0) {
echo " Not perfect, Admin text doesn't have Yes OR No text";
}
else {
echo " Perfect, Admin text has Yes or No";
}
The reason for lies in the DeMorgan's logic laws . 究其原因在于德摩根的逻辑定律 。 Consider the expression
A or B
, where A
represent yes is present, and B
represents no is present: 考虑表达式
A or B
,其中存在A
代表是,存在B
代表否:
A V B
!(A V B)
!A ^ !B
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