What is the purpose of using PHP to call a CSS class for styling input fields in a contact form?

When using PHP to call a CSS class for styling input fields in a contact form, the purpose is to dynamically apply styles to the form elements based on certain conditions or data. This can help in creating a more interactive and visually appealing user experience on the website. 

<input type="text" class="<?php echo ($error) ? 'error' : ''; ?>" name="name" placeholder="Name">

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PHP CSS class styling input fields contact form

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