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<?php $a = [['cpm' => 10], ['cpm' => '20']]; usort($a, function($a,$b){ return $a['cpm'] - $b['cpm']; }); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(1) { ["cpm"]=> int(10) } [1]=> array(1) { ["cpm"]=> string(2) "20" } }

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