What potential issues can arise from trying to pass PHP variables directly into JavaScript code?

One potential issue that can arise from trying to pass PHP variables directly into JavaScript code is that PHP variables are server-side while JavaScript is client-side. This means that PHP variables will not be accessible directly in JavaScript code. To solve this issue, you can use AJAX to make a request to the server and retrieve the PHP variables. 

<?php
// PHP code to retrieve variable
$php_variable = "Hello from PHP!";

?>

<script>
// JavaScript code to make AJAX request and retrieve PHP variable
var xhr = new XMLHttpRequest();
xhr.open('GET', 'get_php_variable.php', true);
xhr.send();

xhr.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        var php_variable = this.responseText;
        console.log(php_variable);
    }
};
</script>

Keywords

XSS data sanitization JSON encoding escaping security vulnerabilities

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