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run code in 200+ php & hhvm versions
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<?php $obj = array('html' => "<a href='#' class=\"\">This isn't a span tag</a>"); var_dump(json_encode($obj)); var_dump(json_encode(json_encode($obj)));
based on SSv5K
Output for 5.2.0 - 7.2.0
string(60) "{"html":"<a href='#' class=\"\">This isn't a span tag<\/a>"}" string(72) ""{\"html\":\"<a href='#' class=\\\"\\\">This isn't a span tag<\\\/a>\"}""
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/YHpLI on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/YHpLI on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/YHpLI on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/YHpLI on line 4