How Can I Safely Pass PHP Variables Containing Quotes and Newlines to JavaScript?

Passing PHP Variables to JavaScript Variables

Problem:

You need to transfer PHP strings containing quotes and newlines to JavaScript variables. Traditional methods like直接输出PHP代码 doesn't handle these special characters correctly.

Answer:

Using json_encode():

<script>
  var myvar = <?= json_encode($myVarValue, JSON_UNESCAPED_UNICODE); ?>;
</script>

This method requires:

• PHP 5.2.0 or later
• $myVarValue encoded in UTF-8

json_encode() converts the PHP string to a JSON representation while preserving Unicode characters.

Considerations:

• If passing the JSON-encoded string to HTML attributes (e.g., onclick), ensure to pass it through htmlspecialchars() to avoid potential HTML entity issues.

  htmlspecialchars(json_encode($string), ENT_QUOTES);

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