<?php
$str = "$("#output").append("<p>This is a test!</p>")";

echo json_encode($str);
?>

json_encode($response, JSON_UNESCAPED_SLASHES);

json_encode($response, JSON_UNESCAPED_SLASHES);

$str = preg_replace('/\"/',""", $str);

$str = preg_replace('/\\"/',""", $str);

$mystring = json_encode($my_json,JSON_UNESCAPED_SLASHES);

$str = str_replace('\', '', $str);

$mystring = json_encode($my_json,JSON_UNESCAPED_SLASHES);

echo json_encode("Hello Worldn");
// results in "Hello Worldn"

echo json_encode('Hello Worldn');
// results in "Hello World\n"

"$("#output").append("
This is a test!</p>")"

echo json_decode($mystring, JSON_UNESCAPED_SLASHES);