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<?php $a = '0'; var_dump(empty($a)); $matrix = array( '2014-06-07' => array( '2014-06-21' => 21.7, '2014-06-23' => 14.7, '2014-06-22' => 121.7, ), '2014-06-09' => array( '2014-06-22' => 14.7, '2014-06-21' => 42.7, '2014-06-23' => 114.7, ), '2014-06-08' => array( '2014-06-23' => 7.7, '2014-06-22' => 14.7, '2014-06-21' => 17.7, ), ); print_r($matrix);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) Array ( [2014-06-07] => Array ( [2014-06-21] => 21.7 [2014-06-23] => 14.7 [2014-06-22] => 121.7 ) [2014-06-09] => Array ( [2014-06-22] => 14.7 [2014-06-21] => 42.7 [2014-06-23] => 114.7 ) [2014-06-08] => Array ( [2014-06-23] => 7.7 [2014-06-22] => 14.7 [2014-06-21] => 17.7 ) )

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