PHP - 比较两个变量
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PHP - compare two variables
提问by anvd
I have this code
我有这个代码
<?php
ob_start();
header("Content-Type: text/html; charset=ISO-8859-1");
$campo = $_GET['campo'];
$valor = $_GET['valor'];
$hello;
if ($campo == "myPassword") {
if (!preg_match("/^\S{4,12}$/", $valor)) {
echo "Tamanho entre 4 e 12 letras e sem espa?os";
}
else
$hello = $valor; //problem here
echo $hello;
}
if ($campo == "passwordMatch") {
if ($hello != $valor ) {
echo "Passwords don't match";
}
}
?>
?>
so, i need to save a variable (where i put "problem here") and compare below, but this code didn't work and i don't know why
所以，我需要保存一个变量（我把“问题放在这里”）并在下面进行比较，但是这段代码不起作用，我不知道为什么
回答by Bloodshot
I would suggest using to compare strings reference: http://php.net/manual/en/function.strcmp.php
我建议使用比较字符串参考：http: //php.net/manual/en/function.strcmp.php
if(strcmp($str1,$str2)):
endif;
or
或者
if(!strcmp($str1,$str2)):
endif;
and replace your code with this
并用这个替换你的代码
if (!preg_match("/^\S{4,12}$/", $valor)) {
echo "Tamanho entre 4 e 12 letras e sem espa?os";
}
else {
$hello = $valor; //problem here
echo $hello;
}
回答by Jakub
Looks like you have a syntax issue here:
看起来您在这里有语法问题：
if ($campo == "myPassword") {
if (!preg_match("/^\S{4,12}$/", $valor)) {
echo "Tamanho entre 4 e 12 letras e sem espa?os";
} else { // missing bracket
$hello = $valor; //problem here
echo $hello;
} // missing bracket
}
Is that your problem? Your ELSEwas missing an opening {and closing }.
那是你的问题吗？你ELSE错过了开头{和结尾}。
ALSO
还
For string comparison, you should use ===and not a numerical ==
对于字符串比较，您应该使用===而不是数字==
Details are here:
详细信息在这里：
回答by Robert Morel
I had the same problem, turned out to be white space, I used trim($myVar);to fix.
我有同样的问题，原来是空白，我曾经trim($myVar);修复过。
回答by Lightness Races in Orbit
If you're expecting $helloto survive between page loads, you're out of luck.
如果您希望$hello在页面加载之间幸存下来，那么您就不走运了。
Instead you'll need to persist the variable between sessionsyourself.
相反，您需要自己在会话之间保留变量。
BTW, the line $hello;doesn't do anything.
顺便说一句，这条线$hello;没有做任何事情。
EditThe reason I have assumed that you need sessions is that you set $helloonly when $campo == "newPassword", then later expect it to be a certain value only when $campo == "passwordMatch". You never change the value of $campo, and clearly it can't be both. This implies that the two pieces of logic are to run on separate page loads.
编辑我假设您需要会话的原因是您$hello只设置when $campo == "newPassword"，然后期望它是某个值仅 when $campo == "passwordMatch"。你永远不会改变 的值$campo，很明显它不能两者兼而有之。这意味着这两个逻辑将在单独的页面加载上运行。
