strcmp（）没有显示正确的输出（PHP）

问题描述：

So here is my code, the problem is that i get strcmp() output as 5 when i enter the password 'malik' in both the fields when it should obviously be 0, i will attach an image to make myself clear. Also, I tried using var_dump($upassword) and var_dump($ucpassword) and I got String(5) for both of them, so there are no whitespaces.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Sign-UP</title>
</head>
<body>
  <form action="signup.php" method="post">
  <input type="text" name="uname" placeholder="enter the username">
  <input type="email" name="uemail" placeholder="enter the email" id="">
  <input type="password" name="upassword" placeholder="Password">
  <input type="password" name="ucpassword" placeholder="confirm password">
  <button type="submit" name="registor">Registor</button>
  </form>
</body>
</html>
<?php
if (isset($_POST['registor'])) {
  $uname = $_POST['uname'];
  $uemail = $_POST['uemail'];
  $upassword = (string)$_POST['upassword'];
  $ucpassword = (string)$_POST['ucpassword'];
  echo($uname."<br>");
  echo($uemail."<br>");
  echo($upassword."<br>");
  echo($ucpassword."<br>");
  if($uname == '' || $uemail == '' || $ucpassword = '' || $ucpassword = ''){
    die("Please fill all the fields");
  }
  echo(strcmp($upassword,$ucpassword));
  if(strcmp($upassword,$ucpassword) != 0){
    die("Passwords are not the same");
  }
 }

所以这是我的代码，问题是当我输入密码时我得到strcmp（）输出为5 malik'在这两个领域显然应该是0， i会附上一张图片让自己清楚。另外，我尝试使用var_dump（$ upassword）和var_dump（$ ucpassword），我得到了两个字符串（5），所以没有空格。 p>

 ＆lt;！DOCTYPE html＆gt; 
＆lt; html lang =”en“＆gt; 
＆lt; head＆gt; 
＆lt; meta charset =  “UTF-8”＆gt; 
＆lt; meta name =“viewport”content =“width = device-width，initial-scale = 1.0”＆gt; 
＆lt; meta http-equiv =“X-UA-Compatible”  content =“ie = edge”＆gt; 
＆lt; title＆gt;注册＆lt; / title＆gt; 
＆lt; / head＆gt; 
＆lt; body＆gt; 
＆lt; form action =“signup.php”method =“post”  ＆gt; 
＆lt; input type =“text”name =“uname”placeholder =“输入用户名”＆gt; 
＆lt; input type =“email”name =“uemail”placeholder =“输入电子邮件”id =  “”＆gt; 
＆lt; input type =“password”name =“upassword”placeholder =“Password”＆gt; 
＆lt; input type =“password”name =“ucpassword”placeholder =“confirm password”＆gt; \  n＆lt;按钮典型 e =“submit”name =“registor”＆gt; Registor＆lt; / button＆gt; 
＆lt; / form＆gt; 
＆lt; / body＆gt; 
＆lt; / html＆gt; 
＆lt;？php 
if（isset（$ _ POST ['  registor']））{
 $ uname = $ _POST ['uname']; 
 $ uemail = $ _POST ['uemail']; 
 $ upassword =（string）$ _ POST ['upassword']; 
  $ ucpassword =（string）$ _ POST ['ucpassword']; 
 echo（$ uname。“＆lt; br＆gt;”）; 
 echo（$ uemail。“＆lt; br＆gt;”）; 
 echo（$ upassword）  。“＆lt; br＆gt;”）; 
 echo（$ ucpassword。“＆lt; br＆gt;”）; 
 if（$ uname ==''||  $ uemail ==''||  $ ucpassword =''||  $ ucpassword =''）{
 die（“请填写所有字段”）; 
} 
 echo（strcmp（$ upassword，$ ucpassword））; 
 if（strcmp（$ upassword，$ ucpassword）！  = 0）{
 die（“密码不相同”）; 
} 
} 
  code>  pre> 
  div>

答

The problem is here:

if($uname == '' || $uemail == '' || $ucpassword = '' || $ucpassword = ''){
  die("Please fill all the fields");
}

You are setting $ucpassword to an empty string. Also instead of first $ucpassword use just $upassword

It should be like this:

if($uname == '' || $uemail == '' || $upassword == '' || $ucpassword == ''){
  die("Please fill all the fields");
}

strcmp（）没有显示正确的输出（PHP）

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