Cacher is the code snippet organizer for pro developers

<?php
$arr = array(
    '0' => array('id' => 1, 'name' => 'name1','amount' => 1),
    '1' => array('id' => 2, 'name' => 'name1','amount' => 2),
    '2' => array('id' => 3, 'name' => 'name3','amount' => 3),
    '3' => array('id' => 4, 'name' => 'name4','amount' => 4),
    '4' => array('id' => 5, 'name' => 'name5','amount' => 5),
);
$name_list = array_column($arr, null,'id');

$filter = array('id' => 1, 'name' => 'name1','amount' => 1);

foreach($arr as $v) {
  if(@$r[$v['name']]) 
	  $r[$v['name']]['amount'] += $v['amount']; 
  else 
	  $r[$v['name']] = $v; 
}
$amount= array_values($r); 
echo json_encode($amount);

$filter = array('name' => 'name1');
foreach($filter as $k=>$v) {
	$positive = array_filter($arr, function($value) use ($k,$v) {
		return ($value[$k]==$v);
	});
	echo json_encode($positive);
}