What is the correct syntax for embedding PHP variables in HTML input fields?

When embedding PHP variables in HTML input fields, you need to use the PHP opening and closing tags within the value attribute of the input field. This allows you to dynamically populate the input field with the value of the PHP variable. Make sure to properly concatenate the variable within the value attribute to ensure it is displayed correctly. 

<input type="text" name="username" value="<?php echo $username; ?>">

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PHP variables HTML input fields syntax

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