$arr = array(15) { [0]=> array(9) { [lppt]=> string(4) lp1 [fg_type]=> string(5) ecu [customer_no]=> string(4) a001 [etype1]=> string(3) dig [revdegree]=> string(2) s [item1]=> float(8810) [rs1]=> float(5787788.527) [item2]=> float(8928) [rs2]=> float(5865309.4176) } [1]=> array(9) { [lppt]=> string(4) lp1 [fg_type]=> string(3) ecu [customer_no]=> string(4) a001 [etype1]=> string(3) mpi [revdegree]=> string(1) b [item1]=> float(0) [rs1]=> float(0) [item2]=> float(0) [rs2]=> float(0) } [2]=> array(9) { [lppt]=> string(4) lp1 [fg_type]=> string(4) ecu [customer_no]=> string(4) a001 [etype1]=> string(3) mpi [revdegree]=> string(2) s [item1]=> float(63485) [rs1]=> float(23211270.7503) [item2]=> float(71973) [rs2]=> float(26689668.0654) } [3]=> array(9) { [lppt]=> string(4) lp1 [fg_type]=> string(4) ecu [customer_no]=> string(4) a002 [etype1]=> string(3) mpi [revdegree]=> string(2) s [item1]=> float(4810) [rs1]=> float(2329072.60146) [item2]=> float(5855) [rs2]=> float(2783605.29921) } [4]=> array(9) { [lppt]=> string(4) lp1 [fg_type]=> string(5) ecu [customer_no]=> string(4) a004 [etype1]=> string(3) mpi [revdegree]=> string(2) s [item1]=> float(1716) [rs1]=> float(652004.847) [item2]=> float(1711) [rs2]=> float(647801.6757) }[5]=> array(9) { [lppt]=> string(4) lp2 [fg_type]=> string(3) ecu [customer_no]=> string(4) a001 [etype1]=> string(3) mpi [revdegree]=> string(1) b [item1]=> float(0) [rs1]=> float(0) [item2]=> float(0) [rs2]=> float(0) }};
求当fg_type项相同时，针对item1,item2,rs1,rs2项的求和，并将求得的结果放在此数组后。
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$arr = array( array('fg_type'=>'ecu1', 'item1'=>8810, 'rs1'=>5787788.527, 'item2'=>8928, 'rs2'=>5865309.4176), array('fg_type'=>'ecu1', 'item1'=>0, 'rs1'=>0, 'item2'=>0, 'rs2'=>0), array('fg_type'=>'ecu2', 'item1'=>63485, 'rs1'=>23211270.7503, 'item2'=>71973, 'rs2'=>26689668.0654), array('fg_type'=>'ecu2', 'item1'=>4810, 'rs1'=>2329072.60146, 'item2'=>5855, 'rs2'=>2783605.29921), array('fg_type'=>'ecu3', 'item1'=>1716, 'rs1'=>652004.847, 'item2'=>1711, 'rs2'=>647801.6757), array('fg_type'=>'ecu3', 'item1'=>0, 'rs1'=>0, 'item2'=>0, 'rs2'=>0), ); $new_arr = array(); for($i=0; $i