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run code in 300+ PHP versions simultaneously
<?php $name = 'CSBill\UserBundle\Entity\User'; $string = sprintf('O:%d:"%s":0:{}', strlen($name), $name); var_dump(unserialize($string));
Output for 5.0.0 - 5.0.3, 5.3.0 - 5.3.29, 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
object(__PHP_Incomplete_Class)#1 (1) { ["__PHP_Incomplete_Class_Name"]=> string(29) "CSBill\UserBundle\Entity\User" }
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Notice: unserialize(): Error at offset 12 of 41 bytes in /in/Xdmj0 on line 7 bool(false)
Output for 4.3.0 - 4.3.10
object(__PHP_Incomplete_Class)(1) { ["__PHP_Incomplete_Class_Name"]=> string(29) "csbill\userbundle\entity\user" }

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