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$a='331612_1,331495_1,331461_2,331559_1,333080_1,333555_1,331448_1,331618_1,333388_1,333408_1,327937_1,331615_1,331499_1';
echo eval('return ' . preg_replace('/(?:^|,)\d+_(\d+)/', '+$1', $a) . ';');
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$a='331612_1,331495_1,331461_2,331559_1,333080_1,333555_1,331448_1,331618_1,333388_1,333408_1,327937_1,';
preg_match_all('/_(\d+)/U',$a,$arr);
echo array_sum($arr[1]);