3v4l.org

run code in 300+ PHP versions simultaneously
<?php $o = array( 1, 'two' => 3, 4 => 'five', null, 'foo', true, false, new stdClass(), ); var_dump(serialize($o));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 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 - 7.2.34, 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 - 8.2.19, 8.3.0 - 8.3.7
string(102) "a:8:{i:0;i:1;s:3:"two";i:3;i:4;s:4:"five";i:5;N;i:6;s:3:"foo";i:7;b:1;i:8;b:0;i:9;O:8:"stdClass":0:{}}"

preferences:
222.74 ms | 406 KiB | 470 Q