D'

$result = [];
foreach ($arr as $key => $values) {
    foreach ($values as $index => $val) {
        $result[$index][$key] = $val;
    }
}

$(document).ready(function(){ 
      show('getTrack.php',$('#song-title'));
      setInterval(function() { show('getTrack.php',$('#song-title')); } ,5000);
});

preg_match("/(?<![A-Z])\s([A-Z]{3})-/Uig", $text, $matches); // для кодов
preg_match("/([0-9]{2}[A-Z]{3})/Uig", $text, $matches); // для дат

<?php
$consts = ['A', 'B', 'C'];
$replace = ['NEW_A', 'NEW_B', 'NEW_C'];
$text = ....; // выборка из базы
$text = str_replace($consts, $replace, $text);
echo $text;