How can hidden input fields be used to pass variables in PHP forms?

Hidden input fields can be used in PHP forms to pass variables between pages without displaying them to the user. This is useful for transferring data that should not be visible or editable by the user, such as session IDs or other sensitive information. To use hidden input fields, simply add an <input type="hidden"> tag within the form and set the value attribute to the variable you want to pass. 

&lt;form method=&quot;post&quot; action=&quot;process.php&quot;&gt;
    &lt;input type=&quot;hidden&quot; name=&quot;session_id&quot; value=&quot;&lt;?php echo $session_id; ?&gt;&quot;&gt;
    &lt;!-- Other form fields here --&gt;
    &lt;button type=&quot;submit&quot;&gt;Submit&lt;/button&gt;
&lt;/form&gt;

Keywords

hidden input fields variables PHP forms passing data web development

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