Online PHP editor | output for DWrn1

<?php $items = array( array ( 'title'=>"a", 'filename'=>"1.jpg" ), array ( 'title'=>"a", 'filename'=>"2.jpg" ), array ( 'title'=>"b", 'filename'=>"1.jpg" ), array ( 'title'=>"b", 'filename'=>"2.jpg" ) ); // I have used below to create an stdClass object array, don't use this line in your code $items = json_decode(json_encode($items)); $finalArray = []; foreach($items as $item){ $finalArray[$item->title]['filename'][] = $item->filename; } foreach($finalArray as $key=>$value){ echo $key.PHP_EOL; foreach($value['filename'] as $val){ echo $val.PHP_EOL; } echo PHP_EOL; echo PHP_EOL; }