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@ 2014-07-30T21:14:23Z

<?php

$array = array (    
	0 => '2014-06-01 12:45:02'
    ,1 => '2014-06-01 12:45:03'
    ,2 => '2014-06-01 12:48:52'
    ,3 => '2014-06-01 12:50:31'
    ,4 => '2014-06-01 13:18:49'
    ,10 => '2014-06-01 13:33:16'
    ,11 => '2014-06-01 14:20:48'
    ,12 => '2014-06-01 14:24:44'
    ,13 => '2014-06-01 15:28:16'
    ,14 => '2014-06-02 10:50:56'
    ,15 => '2014-06-02 10:51:07'
    ,16 => '2014-06-02 18:16:13'
    ,17 => '2014-06-03 11:20:20'
    ,18 => '2014-06-03 11:58:46'
    ,19 => '2014-06-03 11:59:03'
    ,20 => '2014-06-03 12:00:51'
    ,21 => '2014-06-03 12:01:21'
    ,22 => '2014-06-04 19:03:17'
    ,23 => '2014-06-04 19:06:03'
    ,24 => '2014-06-04 19:12:03'
    ,25 => '2014-06-04 21:18:03'
);
	

$new_array = array_map(function($x){return date('Y-m-d', strtotime($x));}, $array);
print_r(array_count_values($new_array));

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 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 - 8.2.18, 8.3.0 - 8.3.6: Array ( [2014-06-01] => 9 [2014-06-02] => 3 [2014-06-03] => 5 [2014-06-04] => 4 )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/qva50 on line 28
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/qva50 on line 28
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/qva50 on line 28
Process exited with code 255.

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