Online PHP editor | output for km9bc

<?php $csv = [ ["uid" => "cgajate", "date" => 20120918], ["uid" => "badrock5", "date" => 20120920], ["uid" => "ricoetc", "date" => 20120921], ["uid" => "ricoetc1", "date" => 20120923], ["uid" => "darbyfired", "date" => 20120922], ["uid" => "sagers.andrew", "date" => 20120922], ["uid" => "frankfurt9", "date" => 20120923], ["uid" => "beachboys", "date" => 20120923], ["uid" => "panterafan", "date" => 20120923], ["uid" => "kingsxrules", "date" => 20120923], ["uid" => "richard.bitto", "date" => 20120924], ["uid" => "christopher.boss", "date" => 20120925], ["uid" => "eric.robinson2", "date" => 20120926] ]; $sql = [ ["uid" => "cgajate", "date" => 20120919], ["uid" => "ricoetc", "date" => 20120921], ["uid" => "ricoetc1", "date" => 20120922], ["uid" => "frankfurt9", "date" => 20120923], ["uid" => "beachboys", "date" => 20120923], ["uid" => "panterafan", "date" => 20120923], ["uid" => "kingsxrules", "date" => 20120923], ["uid" => "eric.robinson2", "date" => 20120926] ]; $result = array_column($csv, 'date', 'uid'); foreach ($sql as ['uid' => $id, 'date' => $date]) { if ($date > ($result[$id] ?? PHP_INT_MIN)) { $result[$id] = $date; } } var_export($result);