Question

我正在使用PHP开发一个项目，我创建了这个文件：

<?php 
$err = false;
if (isset($_POST['submit'])){
    $projectname = $_POST['project_name'];
    if (strlen($projectname)>10){
        $err = true;
        echo "
        <script type='text/javascript'>
            alert('Your project name contains too many words');
        </script>
        ";
    }
    $emailone = $_POST['mail_one'];
    $emailtwo = $_POST['mail_two'];
    $numstars = $_POST['num_stars'];
    $numchars = $numstars + 2;
}
?>
<!DOCTYPE html>
<html>
    <head>
        <title>Welcome To Email Guesser</title>
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css">
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        <div class="container">
            <br />
            <h1 style="text-align:center;color: #F90B6D; font-family: 'Open Sans', sans-serif; font-size: 34px; font-weight: 300; line-height: 40px; margin: 0 0 16px;">Email Guesser <small>v0.2</small></h1>
            <h1 style="text-align:center;color: #F90B6D; font-family: 'Open Sans', sans-serif; font-size: 24px; font-weight: 300; line-height: 32px; margin: 0 0 14px;"><a href="http://www.emailguesser.pouyavagefi.com">www.emailguesser.pouyavagefi.com</a></h1>
            <br />
            <div class="inner contact">
                <!-- Form Area -->
                <div class="contact-form">
                    <!-- Form -->
                    <form id="contact-us" method="POST" action="action.php">
                        <!-- Left Inputs -->
                        <div class="col-xs-6 wow animated slideInLeft" data-wow-delay=".5s">
                            <!-- Name -->
                            <input type="text" name="project_name" id="name" required="required" class="form" placeholder="Name Of Project" />
                            <!-- Another Email Address -->
                            <input type="email" name="mail_one" id="mail" class="form" placeholder="Other Email Address You May Know #1" />
                            <!-- Another Email Address Two -->
                            <input type="email" name="mail_two" id="mail" class="form" placeholder="Other Email Address You May Know #2" />
                            <!-- Subject -->
                            <input type="number" name="num_stars" id="subject" required="required" class="form" placeholder="Number Of Stars" />
                        </div><!-- End Left Inputs -->

                        <!-- Right Inputs -->
                        <div class="col-xs-6 wow animated slideInRight" data-wow-delay=".5s">
                            <!-- Message -->
                            <textarea name="message" id="message" class="form textarea"  placeholder="Message"></textarea>
                        </div><!-- End Right Inputs -->
                        <!-- Bottom Submit -->
                            <div class="relative fullwidth col-xs-12">
                            <button type="submit" id="submit" name="submit" class="form-btn semibold">Submit</button>
                        </div><!-- End Bottom Submit -->
                        <!-- Clear -->
                        <div class="clear"></div>
                    </form><p><i>make your project online on social medias with this hashtag: <strong>#hcktck</strong></i></p>
                </div><!-- End Contact Form Area --></br> 
            </div>
            <hr class="style-one">                  
            <!-- Showing Outputs -->                    
            <div class="container outptut">
                <h3>Returning Results:</h3>
                <?php   
                if($err=false){
                    echo "
                            <p class='bg-primary'> &nbsp; Victim's email address is $numchars characters long</p>
                            <p class='bg-success'> &nbsp; This text indicates success.</p>
                            <p class='bg-info'> &nbsp; This text represents some information.</p>
                            <p class='bg-warning'> &nbsp; This text represents a warning.</p>
                            <p class='bg-danger'> &nbsp; This text represents danger.</p>
                    ";
                }else{
                    echo "<h4 style='color:red;'>an error occured, try again or contact with our developers.</h4>";
                }
                ?>
            </div>
            <center> Visit Developer's Website <a href="http://pouyavagefi.com" target="blank">Pouya Vagefi </a> </center>
        </div>
    </body>
</html>

此文件名为action.php，每当我使用正确的信息运行它时，它会显示我之前设置的an error occured, try again or contact with our developers.。基本上你可以看到我调用了一个布尔变量（$ err），如果出现任何类型的错误（例如一个有太多字符的项目名称），它就会生效。

但问题是，即使我提交的表单中包含正确的信息，此变量也会设置为true。但是我在页面顶部调用$ err = false。

那为什么会发生这件事呢？请注意，根本不会出现任何php错误。

Answer 1

将if($err=false){更改为if($err === false){：

<?php if($err=false){ echo "
                            <p class='bg-primary'> &nbsp; Victim's email address is $numchars characters long</p>
                            <p class='bg-success'> &nbsp; This text indicates success.</p>
                            <p class='bg-info'> &nbsp; This text represents some information.</p>
                            <p class='bg-warning'> &nbsp; This text represents a warning.</p>
                            <p class='bg-danger'> &nbsp; This text represents danger.</p>
                    "; }else{ echo "<h4 style='color:red;'>an error occured, try again or contact with our developers.</h4>"; } ?>

你使用它的方式，你只是将价值设定为。

您需要实际验证这两个值。如果您使用===，那么您还会检查变量类型，在本例中为boolean。

Answer 2

您需要将支票设置为if($err===false)。你现在拥有它的方式，你将它设置为false而不是检查它是否为假。

PHP Query不会返回真实条件

2 个答案: