What are the potential pitfalls of starting a tag with a digit in PHP?

Starting a tag with a digit in PHP can cause syntax errors because PHP tags must begin with a letter or underscore. To avoid this issue, you can prefix the tag with an underscore or a letter before the digit. 

<?php
// Incorrect way to start a PHP tag
// <?php 123
// Corrected way to start a PHP tag
<?php _123
?>

Keywords

PHP tag digit naming convention syntax

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