What are the potential pitfalls of using ternary operators in PHP for echoing variables in form fields?

Using ternary operators in PHP for echoing variables in form fields can make the code harder to read and maintain, especially for complex conditions. It can also lead to errors if not used carefully. To improve readability and maintainability, it's better to use traditional if-else statements for echoing variables in form fields. 

<!-- Using if-else statements for echoing variables in form fields -->
<input type="text" name="username" value="<?php echo isset($username) ? $username : ''; ?>">

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ternary operators PHP echoing variables form fields

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