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<?php $productos = array( array("id" => 10, "name"=>"bread"), array("id" => 12, "name"=>"Jam"), array("id" => 10, "name"=>"bread"), array("id" => 105, "name"=>"lobster") ); $cuenta = array(); foreach($productos as $producto){ if(!isset($cuenta[$producto['id']])){ $cuenta[$producto['id']] = 1; } else { $cuenta[$producto['id']]++; } } var_dump($cuenta);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [10]=> int(2) [12]=> int(1) [105]=> int(1) }

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