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<?php var_dump(unserialize('O:9:"Exception":0:{}'));
based on j2BkW
Output for 5.3.22 - 5.4.43, 5.5.24 - 5.5.27, 5.6.8 - 5.6.11, 5.6.28, 7.0.20 - 7.2.0
object(Exception)#1 (7) { ["message":protected]=> string(0) "" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/jRQ1f" ["line":protected]=> int(2) ["trace":"Exception":private]=> array(1) { [0]=> array(4) { ["file"]=> string(9) "/in/jRQ1f" ["line"]=> int(2) ["function"]=> string(11) "unserialize" ["args"]=> array(1) { [0]=> string(20) "O:9:"Exception":0:{}" } } } ["previous":"Exception":private]=> NULL }
Output for 5.4.44 - 5.4.45, 5.5.28 - 5.5.35, 5.6.12 - 5.6.21, 7.0.0 - 7.0.6
object(Exception)#1 (6) { ["message":protected]=> string(0) "" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/jRQ1f" ["line":protected]=> int(2) ["trace":"Exception":private]=> array(1) { [0]=> array(4) { ["file"]=> string(9) "/in/jRQ1f" ["line"]=> int(2) ["function"]=> string(11) "unserialize" ["args"]=> array(1) { [0]=> string(20) "O:9:"Exception":0:{}" } } } }