php_forms.asp

W3Schools tutorial..web designing

<p class="intro">The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input.</p>
<hr />

<h2>PHP Form Handling</h2>
<p>The most important thing to notice when dealing with HTML forms and PHP is 
that any form element in an HTML page will <b>automatically</b> be available to your PHP scripts.</p>
<p><b>Form example:</b></p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre>&lt;html&gt;
&lt;body&gt;</pre>
<pre>&lt;form action=&quot;welcome.php&quot; method=&quot;post&quot;&gt;
Name: &lt;input type=&quot;text&quot; name=&quot;name&quot; /&gt;
Age: &lt;input type=&quot;text&quot; name=&quot;age&quot; /&gt;
&lt;input type=&quot;submit&quot; /&gt;
&lt;/form&gt;</pre>
<pre>&lt;/body&gt;
&lt;/html&gt;</pre>
</td></tr></table>
<p>The example HTML page above contains two input fields and a submit button. 
When the user fills in this form and click on the submit button, the form data 
is sent to the &quot;welcome.php&quot; 
file.</p>
<p>The &quot;welcome.php&quot; file looks like this:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre>&lt;html&gt;
&lt;body&gt;</pre>
<pre>Welcome &lt;?php echo $_POST[&quot;name&quot;]; ?&gt;.&lt;br /&gt;
You are &lt;?php echo $_POST[&quot;age&quot;]; ?&gt; years old.</pre>
<pre>&lt;/body&gt;
&lt;/html&gt;</pre>
</td></tr></table>
<p>A sample output of the above script may be:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre>Welcome John.
You are 28 years old.</pre>
</td></tr></table>
<p>The PHP $_GET and $_POST variables will be explained in the next chapters.</p>
<hr />

<h2>Form Validation</h2>
<p>User input should be validated whenever possible. Client side validation is 
faster, and will reduce server load. </p>
<p>However, any site that gets enough traffic to worry about server resources, 
may also need to worry about site security. You should always use server side validation if 
the form accesses a database.</p>
<p>A good way to validate a form on the server is to post 
the form to itself, instead of jumping to a different page. The user will then 
get the error messages on the same page as the form. This makes it easier to 
discover the error.</p>
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