如果isset $ _POST [英] If isset $_POST

问题描述

我在一个页面上有一个表单提交到另一页面.在那里，它检查输入邮件是否已填充.如果是这样，则执行某些操作，如果未填满，请执行其他操作.我不明白为什么即使我发送一个空表格也总是说它已设置.什么遗漏或出了什么问题?

I have a form on one page that submits to another page. There, it checks if the input mail is filled. If so then do something and if it is not filled, do something else. I don't understand why it always says that it is set, even if I send an empty form. What is missing or wrong?

step2.php:

step2.php:

<form name="new user" method="post" action="step2_check.php"> 
    <input type="text" name="mail"/> <br />
    <input type="password" name="password"/><br />
    <input type="submit"  value="continue"/>
</form>

step2_check:

step2_check:

if (isset($_POST["mail"])) {
    echo "Yes, mail is set";    
} else {    
    echo "N0, mail is not set";
}

推荐答案

即使未填写，也始终设置大多数表单输入，因此您也必须检查是否为空.

Most form inputs are always set, even if not filled up, so you must check for the emptiness too.

由于!empty()已经同时检查了两者，因此您可以使用以下方法:

Since !empty() is already checks for both, you can use this:

if (!empty($_POST["mail"])) {
    echo "Yes, mail is set";    
} else {  
    echo "No, mail is not set";
}

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