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<?php $d = new \DateTime(); var_dump($d->getLastErrors(), $d->format('Y-m-d'));
based on 5JYdI
Output for 5.4.8 - 5.4.45, 5.6.28, 7.0.20 - 7.2.0
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2015-10-15"
Output for 7.0.6
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-05-03"
Output for 7.0.5
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-03"
Output for 7.0.4
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-10"
Output for 7.0.3
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-18"
Output for 7.0.2
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-23"
Output for 7.0.1
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-24"
Output for 7.0.0
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-27"
Output for 5.6.21
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-05-02"
Output for 5.6.20
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-10"
Output for 5.6.19
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-08"
Output for 5.6.18
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-15"
Output for 5.6.17
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-19"
Output for 5.6.16
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-28"
Output for 5.6.15
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-29"
Output for 5.6.14
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-02"
Output for 5.6.13
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-15"
Output for 5.6.12
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-20"
Output for 5.6.11
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-24"
Output for 5.6.10
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-25"
Output for 5.6.9
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-27"
Output for 5.6.8
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-30"
Output for 5.5.35
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-05-22"
Output for 5.5.34
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-11"
Output for 5.5.33
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-09"
Output for 5.5.32
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-17"
Output for 5.5.31
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-03-21"
Output for 5.5.30
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-01"
Output for 5.5.29
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-17"
Output for 5.5.28
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-21"
Output for 5.5.27
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-22"
Output for 5.5.26
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-26"
Output for 5.5.25
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-04-28"
Output for 5.5.24
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2016-05-24"
Output for 5.4.1 - 5.4.7
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2015-10-27"
Output for 5.3.28 - 5.3.29
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2015-10-31"
Output for 5.3.18 - 5.3.27
array(4) { ["warning_count"]=> int(0) ["warnings"]=> array(0) { } ["error_count"]=> int(0) ["errors"]=> array(0) { } } string(10) "2015-11-02"