What are the potential pitfalls of using double quotes in PHP when working with HTML attributes?

Using double quotes in PHP when working with HTML attributes can lead to conflicts with the PHP syntax, as double quotes are also used to define strings in PHP. To avoid this issue, it is recommended to use single quotes for HTML attributes in PHP to prevent any parsing errors.

// Example of using single quotes for HTML attributes in PHP
echo '<input type="text" name="username">';