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run code in 200+ php & hhvm versions
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<?php var_dump(ini_get('serialize_precision')); ini_set('serialize_precision', 13); var_dump(ini_get('serialize_precision'));
based on 2EWaZ
Output for 7.1.0 - 7.2.0
string(2) "-1" string(2) "13"
Output for 5.6.28, 7.0.20
string(2) "17" string(2) "13"
Output for 5.3.18 - 5.6.21, 7.0.0 - 7.0.6
string(2) "24" string(2) "13"