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<?php $testArray = array(-1, 0, 1, "Feb"); for($i = 0, $size = count($testArray); $i < $size; ++$i) { $testDate = $testArray[$i]; echo $testDate; echo strtotime($testDate), "\n"; echo date('r',strtotime($testDate)), "\n"; }
Output for 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 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.2, 7.2.4 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
-11387642750 Sat, 21 Dec 2013 17:19:10 +0100 0 Thu, 01 Jan 1970 01:00:00 +0100 1 Thu, 01 Jan 1970 01:00:00 +0100 Feb1361401200 Thu, 21 Feb 2013 00:00:00 +0100
Output for 7.3.32 - 7.3.33, 7.4.26, 8.0.13
-11387639150 Sat, 21 Dec 2013 15:19:10 +0000 0 Thu, 01 Jan 1970 00:00:00 +0000 1 Thu, 01 Jan 1970 00:00:00 +0000 Feb1361404800 Thu, 21 Feb 2013 00:00:00 +0000
Output for 7.2.3
-11387642751 Sat, 21 Dec 2013 17:19:11 +0100 0 Thu, 01 Jan 1970 01:00:00 +0100 1 Thu, 01 Jan 1970 01:00:00 +0100 Feb1361401200 Thu, 21 Feb 2013 00:00:00 +0100
Output for 5.1.0 - 5.1.6
-11387642750 Sat, 21 Dec 2013 17:19:10 +0100 0 Thu, 01 Jan 1970 01:00:00 +0100 1 Thu, 01 Jan 1970 01:00:00 +0100 Feb Thu, 01 Jan 1970 01:00:00 +0100
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.4 - 5.0.5
-1-1 Thu, 01 Jan 1970 00:59:59 +0100 01387580400 Sat, 21 Dec 2013 00:00:00 +0100 11387584000 Sat, 21 Dec 2013 01:00:00 +0100 Feb-1 Thu, 01 Jan 1970 00:59:59 +0100
Output for 4.3.0 - 4.3.10, 5.0.0 - 5.0.3
-1-1 Thu, 1 Jan 1970 00:59:59 +0100 01387580400 Sat, 21 Dec 2013 00:00:00 +0100 11387584000 Sat, 21 Dec 2013 01:00:00 +0100 Feb-1 Thu, 1 Jan 1970 00:59:59 +0100

preferences:
256.3 ms | 402 KiB | 398 Q