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Required fields for PHP form validation--w3school study notes w3school offline manual w3school tiy w3school manual download
Required fields for PHP form validation--w3school study notes w3school offline manual w3school tiy w3school manual download
Continuing from the above, verify the required fields through PHP 
Validation rules:
Fields – Validation Rules
Name – required, must contain letters and spaces
Email – required, must contain a valid email address including @ and .
Website – optional, if filled in, it must be a valid URL
Comment – optional, multi-line input field
Gender – required, select one
html code:
<code><span><!DOCTYPE html></span><span><<span>html</span>></span><span><<span>head</span>></span><span><<span>title</span>></span><span></<span>title</span>></span><span></<span>head</span>></span><span><<span>body</span>></span><span><<span>form</span><span>action</span>=<span>htmlspecialchars("<?php</span><span>echo</span> $<span>_SERVER</span>['<span>PHP_SELF</span>']; ?></span>") method='post'>
姓名:<span><<span>input</span><span>type</span>=<span>'text'</span><span>name</span>=<span>'name'</span> /></span><span><<span>span</span><span>style</span>=<span>'color:red'</span>></span>*<span><span><?php</span><span>echo</span><span>$name_Err</span>; <span>?></span></span><span></<span>span</span>></span><span><<span>br</span>/></span>
电邮:<span><<span>input</span><span>type</span>=<span>'text'</span><span>name</span>=<span>'email'</span> /></span><span><<span>span</span><span>style</span>=<span>'color:red'</span>></span>*<span><span><?php</span><span>echo</span><span>$email_Err</span>; <span>?></span></span><span></<span>span</span>></span><span><<span>br</span>/></span>
网址:<span><<span>input</span><span>type</span>=<span>'text'</span><span>name</span>=<span>'website'</span> /></span><span><<span>br</span>/></span>
评论:<span><<span>textarea</span><span>name</span>=<span>'comment'</span><span>rows</span>=<span>3</span><span>cols</span>=<span>21</span>></span><span></<span>textarea</span>></span><span><<span>br</span>/></span>
性别:<span><<span>input</span><span>type</span>=<span>"radio"</span><span>name</span>=<span>'gender'</span><span>value</span>=<span>0</span><span>checked</span>=<span>'checked'</span>/></span>女性
<span><<span>input</span><span>type</span>=<span>"radio"</span><span>name</span>=<span>'gender'</span><span>value</span>=<span>1</span> /></span>男性<span><<span>br</span>/></span><span><<span>input</span><span>type</span>=<span>'submit'</span><span>value</span>=<span>'提交'</span> /></span><span></<span>form</span>></span><span></<span>body</span>></span><span></<span>html</span>></span></code>php code
<code><span><span><?php</span><span>$name</span>=<span>$email</span>=<span>$website</span>=<span>$comment</span>=<span>''</span>;
<span>$name_Err</span>=<span>$email_Err</span>=<span>''</span>;<span>//存储错误信息</span><span>if</span>(<span>$_SERVER</span>[<span>'REQUEST_METHOD'</span>]==<span>'POST'</span>){
<span>if</span>(<span>$_POST</span>[<span>'name'</span>]==<span>''</span>){
<span>$name_Err</span>=<span>'姓名不能为空'</span>;
}<span>else</span>{
<span>$name</span>=test_input(<span>$_POST</span>[<span>'name'</span>]);
}
<span>if</span>(<span>$_POST</span>[<span>'email'</span>]==<span>''</span>){
<span>$email_Err</span>=<span>'邮箱不能为空'</span>;
}<span>else</span>{
<span>$email</span>=test_input(<span>$_POST</span>[<span>'email'</span>]);
}
<span>$website</span>=test_input(<span>$_POST</span>[<span>'website'</span>]);
<span>$comment</span>=test_input(<span>$_POST</span>[<span>'comment'</span>]);
<span>//由于我在html中将女性默认为选中，因此性别不用验证是否为空</span><span>$gender</span>=test_input(<span>$_POST</span>[<span>'gender'</span>]);
}
<span><span>function</span><span>test_input</span><span>(<span>$data</span>)</span>{</span><span>$data</span>=trim(<span>$data</span>);
<span>$data</span>=stripslashes(<span>$data</span>);
<span>$data</span>=htmlspecialchars(<span>$data</span>);
<span>return</span><span>$data</span>;
}
<span>?></span></span></code>The above introduces the required fields for PHP form verification - w3school study notes, including w3school content. I hope it will be helpful to friends who are interested in PHP tutorials.
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