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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)));
Output for git.master, git.master_jit, rfc.property-hooks
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>\"}""

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