What potential issues can arise when trying to send and receive variables between PHP and JavaScript?

One potential issue when sending and receiving variables between PHP and JavaScript is the mismatch in data types. To solve this, you can use JSON to encode the data in PHP before sending it to JavaScript, and then decode it in JavaScript to ensure compatibility. 

<?php
// Encode data in PHP
$data = array("name" => "John", "age" => 30);
$json_data = json_encode($data);
?>

<script>
// Decode data in JavaScript
var jsonData = <?php echo $json_data; ?>;
console.log(jsonData);
</script>

Keywords

PHP JavaScript AJAX JSON Cross-origin restrictions

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