PHP回显使用PHP变量的JavaScript Alert的正确格式是什么？ [重复]

Question

This question already has an answer here:

• Pass a PHP string to a JavaScript variable (and escape newlines) [duplicate] 14 answers

I used

<?php     
$myArr =  "foo" => "bar",
          "bar" => "foo",; 
$myVar =  "Word!";

echo '<script type="text/javascript">alert("The $myVar is print_r($myArr) ");</script>';
?>

To show an alert on the page. I take it is wrong, whats the right way of doing so?

</div>

Answer 1

You should always JSON-encode data used in the context of JavaScript. This makes the data safe for use, so you don't have to worry about injection or escaping.

<script>
  <?php 
      $myArr = array(1, 2, 3, 4, 5);
      $myVar = 'Word!';
      echo 'var myArr = ', json_encode($myArr), ';'; // var myArray = [1, 2, 3, 4, 5];
      echo 'var myVar = ', json_encode($myVar), ';'; // var myVar = "Word!";
  ?>

  console.log(myArr);
</script>