将PHP变量传递给JavaScript

<?php
$php_var = "Hello, World!";
?><script>
var js_var = "<?php echo $php_var; ?>";
console.log(js_var);
</script>

<?php
$php_array = array("apple", "banana", "cherry");
?><script>
var js_array = <?php echo json_encode($php_array); ?>;
console.log(js_array);
</script>

<?php
// 在服务器端，将PHP变量作为响应返回
header("Content-Type: application/json");
echo json_encode($php_var);
?><script>
// 在客户端，使用jQuery AJAX获取PHP变量
$.get("get_php_var.php", function(data) {
  var js_var = data;
  console.log(js_var);
});
</script>