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<?php echo strtotime('now') - strtotime("2016-01-17 13:30:18"); ?>
Output for 5.6.28, 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 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 - 8.3.4, 8.3.6
4034
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 4034
Output for 7.3.32 - 7.3.33, 8.0.13
434
Output for 7.0.6
10797923
Output for 7.0.5
6636111
Output for 7.0.4
4609764
Output for 7.0.3
5306259
Output for 7.0.2
5674294
Output for 7.0.1
5771653
Output for 7.0.0
6034029
Output for 5.6.21
9166586
Output for 5.6.20
7237456
Output for 5.6.19
4379967
Output for 5.6.18
5017080
Output for 5.6.17
5404199
Output for 5.6.16
6123419
Output for 5.6.15
6212795
Output for 5.6.14
7615737
Output for 5.6.13
7704472
Output for 5.6.12
8102308
Output for 5.6.11
8471054
Output for 5.6.10
8565006
Output for 5.6.9
8757480
Output for 5.6.8
8960672
Output for 5.5.35
10930859
Output for 5.5.34
7331949
Output for 5.5.33
4477469
Output for 5.5.32
5204198
Output for 5.5.31
5502167
Output for 5.5.30
6478675
Output for 5.5.29
7842350
Output for 5.5.28
8200679
Output for 5.5.27
8292926
Output for 5.5.26
8661096
Output for 5.5.25
8860689
Output for 5.5.24
11044168

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