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run code in 150+ php & hhvm versions
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<?php $data = array(); $saneStringData = isset($data) ? (string) $data : ""; var_dump($saneStringData);
based on CiZP2
Output for 4.3.0 - 4.4.9, 5.4.0 - 7.1.0
Notice: Array to string conversion in /in/opJ5V on line 3 string(5) "Array"
Output for 5.0.0 - 5.3.29
string(5) "Array"