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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 $producto){ if(empty($cuenta[$producto['id']])){ $cuenta[$producto['id']] = 0; } else { $cuenta[$producto['id']]++; } }
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