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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']]++; } } var_dump($cuenta);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(3) { [10]=> int(0) [12]=> int(0) [105]=> int(0) }
Output for 7.1.10

Process exited with code 137.
preferences:
182.2 ms | 401 KiB | 372 Q