Looped array need for an "eFormOnBeforeMailSent" script

How do I retrieve these values using a looped array in php?

$QUANTITY_1=$fields[’QUANTITY_1’];
$ID_1=$fields[’ID_1’];
$NAME_1=$fields[’NAME_1’];
$ADDTLINFO_1=$fields[’ADDTLINFO_1’];

$QUANTITY_2=$fields[’QUANTITY_2’];
$ID_2=$fields[’ID_2’];
$NAME_2=$fields[’NAME_2’];
$ADDTLINFO_2=$fields[’ADDTLINFO_2’];

Etc
etc