<?php $text="a,b,c,d,e,f,g,h,i,10,a,b,c,d,e,f,g,h,i,20,a,b,c,d,e,f,g,h,i,30,a,b,c,d,e,f,g,h,i,40,a,b,c,d,e,f,g,h,i,50"; $groups=preg_split('/(?:[^,]+\K,){39}/',$text); foreach($groups as $group){ echo "$group\n"; }
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