PHP Decode

<?php 
 
$_0xcJOPdTMP42 = ['!', 'd']; 
$_0xnwj0FxRunG = [' ', 'o', 'r', 'W', 'l']; 
$_0xylb5Lxi1NV = ['H', 'l', 'o', 'l', 'e']; 
$_0xc9Pabw5H7M = ['g', '.']; 
$_0xyutBPnos0K = ['i', 't', 'n', 'r', 's']; 
$_0xkq1deC0Y7w = ['t', 't', ' ', 's', 'e']; 
$_0xxKoqtZArHU = ['i', ' ', 's', 'a', ' ']; 
$_0xvSgYrHQQJF = ['i', 's', 'T', 'h', ' ']; 
  
function testFunction() { 
    return $_0xvSgYrHQQJF[0x2] . $_0xvSgYrHQQJF[0x3] . $_0xvSgYrHQQJF[0x0] . $_0xvSgYrHQQJF[0x1] . $_0xvSgYrHQQJF[0x4] . $_0xxKoqtZArHU[0x0] . $_0xxKoqtZArHU[0x2] . $_0xxKoqtZArHU[0x4] . $_0xxKoqtZArHU[0x3] . $_0xxKoqtZArHU[0x1] . $_0xkq1deC0Y7w[0x1] . $_0xkq1deC0Y7w[0x4] . $_0xkq1deC0Y7w[0x3] . $_0xkq1deC0Y7w[0x0] . $_0xkq1deC0Y7w[0x2] . $_0xyutBPnos0K[0x4] . $_0xyutBPnos0K[0x1] . $_0xyutBPnos0K[0x3] . $_0xyutBPnos0K[0x0] . $_0xyutBPnos0K[0x2] . $_0xc9Pabw5H7M[0x0] . $_0xc9Pabw5H7M[0x1]; 
} 
$helloworld = $_0xylb5Lxi1NV[0x0] . $_0xylb5Lxi1NV[0x4] . $_0xylb5Lxi1NV[0x1] . $_0xylb5Lxi1NV[0x3] . $_0xylb5Lxi1NV[0x2]; 
echo $helloworld . $_0xnwj0FxRunG[0x0] . $_0xnwj0FxRunG[0x3] . $_0xnwj0FxRunG[0x1] . $_0xnwj0FxRunG[0x2] . $_0xnwj0FxRunG[0x4] . $_0xcJOPdTMP42[0x1] . $_0xcJOPdTMP42[0x0] . PHP_EOL; 
echo 0x0+0x3039;0x1+0x3038;0x1-0x3038;0x2+0x3037;0x2-0x3037; ?>