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run code in 150+ php & hhvm versions
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<?php echo addslashes('{"description":"<span style=\"font-size:7pt;font-family:\'Times New Roman\'\">&nbsp; </span>"}');
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
{\"description\":\"<span style=\\\"font-size:7pt;font-family:\'Times New Roman\'\\\">&nbsp; </span>\"}