[ACCEPTED]-Is there a PHP function that only adds slashes to double quotes NOT single quotes-json

Accepted answer

Score: 60

Although you should use json_encode if it’s available 3 to you, you could also use addcslashes to add \ only 2 to certain characters like:

addcslashes($str, '"\\/')

You could also 1 use a regular expression based replacement:

function json_string_encode($str) {
    $callback = function($match) {
        if ($match[0] === '\\') {
            return $match[0];
        } else {
            $printable = array('"' => '"', '\\' => '\\', "\b" => 'b', "\f" => 'f', "\n" => 'n', "\r" => 'r', "\t" => 't');
            return isset($printable[$match[0]])
                   ? '\\'.$printable[$match[0]]
                   : '\\u'.strtoupper(current(unpack('H*', mb_convert_encoding($match[0], 'UCS-2BE', 'UTF-8'))));
        }
    };
    return '"' . preg_replace_callback('/\\.|[^\x{20}-\x{21}\x{23}-\x{5B}\x{5D}-\x{10FFFF}/u', $callback, $str) . '"';
}

Score: 19

Is there a PHP function that only adds slashes 10 to double quotes NOT single quotes

There 9 is no function like addslashes() that only adds a slash 8 to double quotes.

However you can make use 7 of addcslashes() to only add slashes to specific characters, e.g. only to 6 double quotes:

addcslashes($string, '"');

That does exactly as described. If 5 you want to have it compatible with stripcslashes() however, you 4 need to add the slash itself to the list 3 of chars:

addcslashes($string, '"\\');

That should do the job you've been 2 asking for. I have no idea if that is compatible 1 with json encoding.

Score: 4

If you are generating JSON, why not just 1 use the json_encode() function ?

Score: 2

function json_string_encode( $str ) {
   $from = array('"');    // Array of values to replace
   $to = array('\\"');    // Array of values to replace with

   // Replace the string passed
   return str_replace( $from, $to, $str );
}

To use the function you simply need to use

$text = json_string_encode($text);

Source: stackoverflow.com

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