What are the potential causes of question mark characters appearing in PHP code?

Question mark characters can appear in PHP code if the file encoding is not properly set to UTF-8. To solve this issue, make sure to set the file encoding to UTF-8 without BOM (Byte Order Mark). This can be done by using a text editor that supports changing the file encoding or by adding a PHP directive to set the encoding. 

<?php
// Set the file encoding to UTF-8 without BOM
header('Content-Type: text/html; charset=utf-8');
?>

Keywords

Character encoding UTF-8 htmlentities htmlspecialchars encoding issues

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