What role do quotation marks play in causing problems with echo() in PHP when outputting JavaScript code?

Quotation marks can cause problems with `echo()` in PHP when outputting JavaScript code because they can interfere with the syntax of the JavaScript code. To solve this issue, you can use a combination of single and double quotes to properly encapsulate the JavaScript code within the `echo()` statement. 

<?php
echo '<script>';
echo 'alert("Hello, world!");';
echo '</script>';
?>

Keywords

quotation marks echo() JavaScript code PHP outputting

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