1 2 3 4 5 6
<?php $array = array('7-10','7-11','5-10'); foreach($array as $a){list($x[], $y[]) = explode("-", $a);} print_r(array_unique($x)); print_r(array_unique($y)); ?>
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Array ( [0] => 7 [2] => 5 ) Array ( [0] => 10 [1] => 11 )