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run code in 200+ php & hhvm versions
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<?php var_dump(gmp_strval(gmp_init(substr(md5($str), 0, 16), 16), 10));
Output for 5.4.1 - 5.5.34, 5.6.8 - 5.6.20, 5.6.28 - 7.0.5, 7.0.20 - 7.2.0
Notice: Undefined variable: str in /in/p9jIc on line 3 string(20) "15284527576400310788"
Output for 7.0.6
Fatal error: Uncaught Error: Call to undefined function gmp_strval() in /in/p9jIc:3 Stack trace: #0 {main} thrown in /in/p9jIc on line 3
Process exited with code 255.
Output for 5.3.18 - 5.3.29, 5.5.35, 5.6.21
Fatal error: Call to undefined function gmp_strval() in /in/p9jIc on line 3
Process exited with code 255.