我的if(isset($_POST['submit'])) 代码有点问题。我想要的是一些回声和一个在脚本打开时不显示的表格,但我确实希望它在单击表单的提交按钮时显示。问题是,当我包含 if(isset($_POST['submit'])) 函数时,当我单击提交按钮时,它根本不显示回声和表格。这是为什么,你能帮我解决这个问题吗? 下面是代码: <!
if (empty($_POST['name']) || empty($_POST['email']) || empty($_POST['message'])) { $error = 'Please fill out all required fields.'; } else { // Check if the email address is valid if (!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) { $error = 'Please enter a ...
PHP要判断表单元素的值是否为空，首先需要提交表单，然后根据name获取表单元素，判断是否为空即可。示例如下：<?phpif($_POST['sub']){//获取文本框的内容$content=$_POST['content'];if($content==""){echo "文本框内容为空！";}else{echo "文本框内容不为空！";}}?>演示<form name="for...
您需要给予您的提交命名，否则$_POST['submit']将无法用途：
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*$/", $usr)){ $nameerr="只能字母和数字"; } } var_dump($nameerr); //验证email if(...empty($_POST['email'])){ $emailerr="邮箱不能为空"; }else{ $email=test_input($_POST['email']); if(!...'])){ $urlerr="网址不能为空"; }else{ $url=test_input($_POST['url']);...
例如,$username = $_POST['username'];可以获取名为'username'的表单字段的值。 使用'if'语句进行验证:通过使用条件语句'if',可以对表单数据进行验证。以下是一些常见的验证示例: 验证必填字段:检查字段是否为空或未设置。例如,if (empty($username)) { echo "用户名不能为空"; } 验证数据类型:检查字段是否...
{ - echo $ease_seo_description_a; - } -} +/i', $post->post_content, $matches); + $first_img = $matches [1] [0]; + //判断图片是否过小 + // if(!empty($first_img)) + // { + // $image_size = getimagesize($first_img); + // $image_width = $image_size[0]; + ...
empty( $_COOKIE['autoroyal_view_type'] ) ) {$view_type = $_COOKIE['autoroyal_view_type'];}$post_status = array( 'publish' );if ( is_home() || is_front_page() ) {$paged = get_query_var( 'page' ) ? get_query_var( 'page' ) : 1;}...
1. Quick Examples of Checking if String is Empty If you are in a hurry, below are some quick examples of how to check whether the given string is empty or not in Python. # Quick Examples # Using not to check if string is empty ...