<?php
$arr = [
['TAG' => 'Peter', 'DATA' => 'happy123'],
['TAG' => 'Sam', 'DATA' => 'dog11111'],
];
echo getDataByTag($arr, 'Sam');
function getDataByTag($arr, $tag){
foreach($arr as $data){
if($data['TAG'] == $tag)
return $data['DATA'];
}
}
PD9waHAKCiRhcnIgPSBbCiAgWydUQUcnID0+ICdQZXRlcicsICdEQVRBJyA9PiAnaGFwcHkxMjMnXSwKICBbJ1RBRycgPT4gJ1NhbScsICdEQVRBJyA9PiAnZG9nMTExMTEnXSwKXTsKCmVjaG8gZ2V0RGF0YUJ5VGFnKCRhcnIsICdTYW0nKTsKCmZ1bmN0aW9uIGdldERhdGFCeVRhZygkYXJyLCAkdGFnKXsKICAgIGZvcmVhY2goJGFyciBhcyAkZGF0YSl7CiAgICAgICAgaWYoJGRhdGFbJ1RBRyddID09ICR0YWcpCiAgICAgICAgICAgIHJldHVybiAkZGF0YVsnREFUQSddOwogICAgfQp9