JavaScript breaks when there is a double quote in returned JSON [duplicate]

Question

I'm creating a JSON string from a PHP array. I've encoded it using json_encode().

$data = array(
    'title' => 'Example string\'s with "special" characters'
);

$data = json_encode( $data );

$data is localized using wp_localize_script() and is accessible via a global data variable.

In the JS file I can access the information by the following:

var data     = data.replace( /"/g, '"' ),
    jsonData = jQuery.parseJSON( data );

console.log( jsonData );

This results in an output of:

{ "title":"Example string's with "special" characters" }

Entering that result into http://jsonlint.com/ returns an error. Removing the double quotes around "special" validates the string.

What is the best way to create a JSON string from PHP and properly escape it for use in a JS file?

Answer 1

Another way would be to encode the quotes using htmlspecialchars:

$json_array = array(
    'title' => 'Example string\'s with "special" characters'
);

$json_decode = htmlspecialchars(json_encode($json_array), ENT_QUOTES, 'UTF-8');

Answer 2

I succefully just did this :

$json = str_replace("\u0022","\\\\\"",json_encode( $phpArray,JSON_HEX_QUOT)); 

json_encode() by default will escape " to \" . But it's still wrong JSON for json.PARSE(). So by adding option JSON_HEX_QUOT, json_encode() will replace " with \u0022. json.PARSE() still will not like \u0022. So then we need to replace \u0022 with \\". The \\\\\" is escaped \\".

NOTE : you can add option JSON_HEX_APOS to replace single quote with unicode HEX value if you have javascript single quote issue.

ex: json_encode( $phpArray, JSON_HEX_APOS|JSON_HEX_QUOT ));