已知数组：
$arr = array(15) { [0]=> array(9) { ["lppt"]=> string(4) "lp1 " ["fg_type"]=> string(5) "ecu " ["customer_no"]=> string(4) "a001" ["etype1"]=> string(3) "dig" ["revdegree"]=> string(2) "s " ["item1"]=> float(8810) ["rs1"]=> float(5787788.527) ["item2"]=> float(8928) ["rs2"]=> float(5865309.4176) } [1]=> array(9) { ["lppt"]=> string(4) "lp1 " ["fg_type"]=> string(3) "ecu" ["customer_no"]=> string(4) "a001" ["etype1"]=> string(3) "mpi" ["revdegree"]=> string(1) "b" ["item1"]=> float(0) ["rs1"]=> float(0) ["item2"]=> float(0) ["rs2"]=> float(0) } [2]=> array(9) { ["lppt"]=> string(4) "lp1 " ["fg_type"]=> string(4) "ecu " ["customer_no"]=> string(4) "a001" ["etype1"]=> string(3) "mpi" ["revdegree"]=> string(2) "s " ["item1"]=> float(63485) ["rs1"]=> float(23211270.7503) ["item2"]=> float(71973) ["rs2"]=> float(26689668.0654) } [3]=> array(9) { ["lppt"]=> string(4) "lp1 " ["fg_type"]=> string(4) "ecu " ["customer_no"]=> string(4) "a002" ["etype1"]=> string(3) "mpi" ["revdegree"]=> string(2) "s " ["item1"]=> float(4810) ["rs1"]=> float(2329072.60146) ["item2"]=> float(5855) ["rs2"]=> float(2783605.29921) } [4]=> array(9) { ["lppt"]=> string(4) "lp1 " ["fg_type"]=> string(5) "ecu " ["customer_no"]=> string(4) "a004" ["etype1"]=> string(3) "mpi" ["revdegree"]=> string(2) "s " ["item1"]=> float(1716) ["rs1"]=> float(652004.847) ["item2"]=> float(1711) ["rs2"]=> float(647801.6757) }[5]=> array(9) { ["lppt"]=> string(4) "lp2 " ["fg_type"]=> string(3) "ecu" ["customer_no"]=> string(4) "a001" ["etype1"]=> string(3) "mpi" ["revdegree"]=> string(1) "b" ["item1"]=> float(0) ["rs1"]=> float(0) ["item2"]=> float(0) ["rs2"]=> float(0) }}; 求当fg_type项相同时，针对item1,item2,rs1,rs2项的求和，并将求得的结果放在此数组后。
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$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; $i'; print_r($arr); 测试结果应该没问题，不知道这么写好不好，凑合着看...
