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$arr = array(
array(
"title" => 'a1',
"id" => '1'
),
array(
"title" => 'b1',
"id" => '2'
),
array(
"title" => 'b2',
"id" => '2'
)
);
for( $i=0; $i < count($arr); $i++)
{
echo $arr[$i]['id'];
}
$arr = array(
array(
"title" => 'a1',
"id" => '1'
),
array(
"title" => 'b1',
"id" => '2'
),
array(
"title" => 'b2',
"id" => '2'
)
);
foreach($arr as $v)
$r[$v['id']][] = $v;
print_r($r);
Array
(
[1] => Array
(
[0] => Array
(
[title] => a1
[id] => 1
)
)
[2] => Array
(
[0] => Array
(
[title] => b1
[id] => 2
)
[1] => Array
(
[title] => b2
[id] => 2
)
)
)