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run code in 300+ PHP versions simultaneously
<?php $x = 'a:2:{i:0;O:8:"stdClass":1:{i:0;a:1:{i:0;i:1;}}i:1;R:3;}'; $y = unserialize($x); var_dump($y);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> object(stdClass)#1 (1) { ["0"]=> &array(1) { [0]=> int(1) } } [1]=> &array(1) { [0]=> int(1) } }

preferences:
274.57 ms | 404 KiB | 375 Q