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PHP表单验证：了解如何检查用户提交的数据
PHP超文本预处理器是一种编程语言，被web开发人员用来构建动态网站或基于web的应用程序。这种语言的动态特性提供了从数据库中存储、检索、更新或删除信息的功能。当PHP与HTML结合使用时，可以使web应用程序和网站更具交互性和效率。
PHP处理器模块在服务器处解释PHP脚本并返回生成的网页。PHP代码写在标签中，可以嵌入在HTML文件中，也可以单独使用。它是一种高级编程语言，支持面向对象的编程概念。除面向对象的编码外，使用PHP对于交易非常安全可靠，并在Web上发送高机密数据。在其他服务器端脚本语言中使用PHP的最佳优势是它配备了开源代码，这意味着您不必支付金钱以使用它提供的功能。您还可以将您自己的库添加到文档中。
语法:
<！doctype html>php test </ title> </ head> <body> <？php echo'<p> hello我在php </ p>'内部;？> </ body> </ html></pre> <p><strong>验证是什么?</strong></p> <p>验证用于检查用户从您网站上的特定表单提交的值。在客户端进入所有所需数据后执行验证，然后按“提交”按钮。如果用户输入的数据不匹配或不正确或缺少输入，则输入的信息将不会存储并返回错误。然后，您要求用户在重新提交之前更正输入。</p> <p><a href="https://www.udemy.com/course/simple-contact-form-php/?tc=blog.phpformvalidation&couponCode=half-off-for-blog">了解如何在Udemy.com上创建一个简单的PHP联系表单。</a></p> <p>有2种类型的验证：</p> <p><strong>客户端验证</strong>：此验证在客户端执行，即，所有信息都不发送到服务器以进行验证，而是在客户端计算机上执行。它更快，服务器友好，但它可以轻松突破。只有在最终用户启用Java脚本并由Web浏览器支持，才能实现客户端验证。</p> <p><strong>服务器端验证</strong>:这种类型的验证在服务器上执行。当按下提交按钮并服务器验证数据时，数据被发送到服务器。这些差异以呈现网页的形式作为错误返回。服务器端验证更加可靠和安全，因为您不能以任何方式提交不正确的数据。像PHP这样的所有服务器端脚本语言都能够进行这种类型的验证。</p> <p>验证执行两个功能:</p> <p><strong>基本验证</strong>：检查表单以确保在每个表单字段中输入所有数据。它逐一完成每个表单字段并检查条目。例如，Facebook注册表单使用基本服务器端验证。</p> <p><strong>数据格式验证</strong>：输入的数据被选中以诸如电子邮件地址等格式，该格式应包含“@”符号和域。这需要更多的逻辑和编码。大多数开发人员使用正则表达式来检查格式验证。</p> <p>例如：如果表单字段接受整数值，则拒绝除整数之外的所有值都会被错误消息拒绝。最广泛的格式验证用于TextBox字段，这需要所有类型的验证。背后的原因是它可以存储大量的字母数字值，例如电话号码，电子邮件ID和用户名。</p> <p><strong>PHP表单验证的示例</strong></p> <pre><input type="text" Name ="Name" /> Email:<input type="text" Name ="Email" /> Number:<input type="text" Name =" Number " /> <input type="submit" Name ="submit" /> </form> </body> </html></pre> <p>验证PHP脚本:Validate . PHP</p> <pre>如果($ _SERVER“REQUEST_METHOD”= =“POST”){$ name = $ _POST[“name”]$邮件= $ _POST["电子邮件");美元数量= $ _POST(“网站”);} if (null ($name)){echo "<p class=\"error\">你的姓不能为空</p>";} if($email)))){echo "<p >你的email id不能为空</p>";{echo " <p> number应为10位</p> "}} {echo " <p> number应为10位<p> "}</pre> <p>上面的示例解释了验证的非常基本的实现。有三个条目，其中输入来自用户。然后将此输入发送到验证过程的validate.php文件。选中输入的名称，如果它为空，则会返回错误。类似地，剩余的两个表单字段用于相同类型的内容。错误消息显示在屏幕上，以便用户可以根据表单的要求填充条目。这是文本字段验证。</p> <p>验证也可以应用于HTML中存在的所有其他表单字段。不同的表单字段需要不同类型的验证。例如，验证了RADIObutton控件以检查是否选择了它。</p> <p><strong>为什么需要验证？</strong></p> <p>验证已经成为web开发过程中的一个重要部分。betwayapp下载安装它几乎应用于所有涉及用户交互的网站。这样做的原因是为了通过防止不希望的用户请求访问信息来节省服务器上的工作负载。它检查用户的身份验证，帮助保持网络的安全。</p> <p><strong>使用的验证:</strong></p> <ul> <li>它可以防止用户进行未经授权的访问。</li> <li>它有助于提供真实的数据。</li> <li>客户端验证将服务器从不需要的和不必要的负载中保存，否则可能会导致其崩溃。</li> <li>验证可以防止由于匿名存储信息而导致数据库过载。</li> <li>安全性可以通过验证轻松实现。</li> <li>用户不能违反使用PHP完成的验证，因为它是通过服务器端验证完成的。</li> </ul> <p></p> <p>这段代码是PHP表单验证的基本概述，但是如果您想了解更多，<a 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