Phpforloop.PHP是Web开发人员使用的服务器端脚本语言,以构建动态网站或基于Web的应用程序。术语“动态网站”表示网站提供了用于存储,检索,更新或删除数据库中的信息的功能。PHP嵌入HTML(超文本上提起语言),这是用于制作静态网页的标记语言。HTML以括在角括号中的标签中写入,等标签。Web浏览器读取HTML文档并显示结果。PHP也是标记语言,并与HTML组合使用,使Web应用程序和网站更具交互和高效。

PHP处理器模块在服务器级别解释PHP脚本,并返回生成的网页。PHP代码写在PHP标签中,可以嵌入在HTML文件中或单独使用。PHP是一种高级编程语言,支持面向对象的编程概念,这是最大的优势。这使得PHP非常安全可靠地对交易并在Web上发送高机密数据。在其他服务器端脚本语言中使用PHP的最佳优势是它是开源的,这意味着您不必支付金钱以使用它。

通过观看Udemy.com的教程,从头开始学习PHP

PHP包含在以下代码中指定的标签中:

<?php echo'

hello我是php ';?>

什么是验证?

术语“验证”表示检查用户提交的输入。表单是用于收集数据的输入文本框,无线电框,复选框和其他Web控件。在客户端进入所有所需数据后执行验证,然后按“提交”按钮。如果输入的任何数据与必需的模式不匹配,则丢失或错误输入,信息未存储并返回错误消息。然后,用户将在重新提交之前编辑输入。

有2种类型的验证:

客户端验证:在客户端验证中,在客户端计算机上的Web浏览器上执行验证。使用JavaScript是可能的。

服务器侧验证:在服务器端验证中,按下提交按钮时数据将发送到服务器。与客户端验证相比,服务器端验证更可靠,安全。所有服务器端脚本语言,如PHP执行此类验证。

在HTML中制作简单的联系表单

  验证表单</ title> </ head> <body> <form id =“contact_form”方法=“post”action =“。”> <br />标签<输入类型=“文本“name =”名称“class =”textfield“值=”“/> <br />电子邮件<输入类型=”文本“名称=”电子邮件“类=”textfield“值=”“/> <br />电话号码<输入类型=“text”name =“number”class =“textfield”值=“”/> <br /> <p> <输入类型=“提交”名称=“提交”类=“按钮”值=“提交”/> </ p> </ form> </ body> </ html></pre>
    <p>在上面的联系表单中,我们有三个输入字段名为名称,电子邮件和电话号码。所有输入字段都放在表单标记内。输入标记具有属性“类型”,它定义了输入字段的类型,例如文本字段,密码或按钮。</p>
    <p><a title="想要了解有关PHP的更多信息吗?查看Udemy.com的教程" href="https://www.udemy.com/course/phpmysql-for-beginners/?tc=blog.phpcontactformwithvalidation&couponCode=half-off-for-blog">想要了解有关PHP的更多信息吗?查看Udemy.com的教程</a></p>
    <p>表单标记具有名为“方法”的属性,该属性定义了用户输入的数据如何在服务器上提交。通常,有两种方法可以向服务器提交数据:发布并获得。在POST在封闭的消息主体中发送数据时,通过QueryString变量中的URL将值传递给服务器。</p>
    <p>让我们将一些PHP代码添加到联系人表单页面,以便将数据发送到服务器以进行验证。</p>
    <pre><?php if(isset($ _ post ['提交']))){//包括验证类//将帖子数据分配给变量$ name = trim($ _ post ['name']);//存储用户名$电子邮件=修剪($ _ post ['电子邮件]);//存储电子邮件地址$ number = trim($ _ post ['number']);//存储电话号码}?></pre>
    <p>单击提交的按钮时执行上述代码。“isset”函数检查是否作为函数中的参数传递的变量的值是设置的,并返回“true”或“false”。在上面的表单中,“$ _post ['提交']”已验证。如果单击“提交”按钮,则由ISSET功能返回TRUE,如果没有,则返回FALSE。如果该值为真,则执行“if”块,并且输入参数保存在相应的变量中。“修剪”函数用于删除空白。然后验证存储文本字段值的这些变量。</p>
    <p>编写代码后,保存PHP文件并将其命名为validate.php。然后,您使用“包含”函数在“联系人表单”页面中包含此文件。由于我们已经保存了所有PHP表格的数据,我们可以通过验证脚本运行它。</p>
    <p>要检查是否留空任何字段,我们使用空函数并将其传递参数。</p>
    <pre>if(空($ name)&&空($ number)&&空($电子邮件)){echo“所有字段都是强制性的”}</pre>
    <p>如果任何字段留空,则屏幕上会显示错误消息。如果变量不包含任何值,则空函数返回true。</p>
    <p>然后可以检查用户名,如最小或最大长度,可以检查各种验证点。执行此类验证的代码如下:</p>
    <pre>if(strlen($ name)> = 5 && strlen($ name)<= 10)</pre>
    <p>上面的代码检查输入的用户名是否具有大于或等于5且小于或等于10的数量。“strlen”函数返回通过参数中存在的字符数。</p>
    <p>您还需要检查不合适的字符。以下代码是此类型验证的示例:</p>
    <pre>if(preg_match(“/ ^ [a-z0-9 _] + $ / i”,$名称)){返回true;} else {echo“输入有效的用户名”}</pre>
    <p>PREG_MATCH函数与作为参数传递的正则表达式匹配。上面的正则表达式仅接受字母数字值,只有下划线作为特殊符号。没有接受非法字符。正则表达式是用于与字符串匹配的模式的字符序列。</p>
    <p><strong>验证电子邮件:</strong>电子邮件字段为两件事验证。首先,它不应为空,输入的电子邮件必须有效。</p>
    <pre><?php $ reg ='/ ^[_a-z0-9-] +('[__z0-9-] +)* [a-z0-9-] +('[〜a-z0-9-]+)*(\.[a-z]{2,3})$/'; if (preg_match($reg, $email)) { echo $email . \" Email Id is accepted.\"; } else { echo $email . \"Invalid Email ID.\"; } ?></pre>
    <p>上面的代码验证了电子邮件地址。正则表达式存储在变量中并通过PREG_MATCH函数来进行比较电子邮件地址值。如果它与正则表达式匹配,则仅接受电子邮件地址。</p>
    <p><strong>电话号码验证:</strong></p>
    <pre>if((preg_match(preg_match('/ [^ 0-9] /“,'',$ str))&& strlen($ str)== 10){echo”无效的电话号码}</pre>
    <p><a title="了解如何在udemy.com上使用PHP更深入地工作" href="https://www.udemy.com/course/simple-contact-form-php/?tc=blog.phpcontactformwithvalidation&couponCode=half-off-for-blog">了解如何在udemy.com上使用PHP更深入地工作</a></p>
    <p>对于有效的电话号码,检查了两个条件:数量的长度应该是十个,只接受数值。PREG_MATCH函数与数值匹配的正则表达式匹配,并且仅在输入数字值时才能返回true。“strlen”功能检查为电话号码输入的字符数,必须为10.验证传递。</p>
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