php 基礎有關問題二維數組求和_PHP教程

　　php 基礎問題二維數組求和 !

　　數組：

　　$a = array(array("a"=>"aa","a1"=>1,"a2"=>1),array("a"=>"bb","a1"=>2,"a2"=>2),array("a"=>"cc","a1"=>3,"a2"=>3),

array("a"=>"aa","a1"=>1,"a2"=>1),array("a"=>"bb","a1"=>5,"a2"=>5))

　　第一個索引值相同的元素 求和

　　結果

　　$r = array(array("a"=>"aa","a1"=>2,"a2"=>2),array("a"=>"bb","a1"=>7,"a2"=>7),array("a"=>"cc","a1"=>3,"a2"=>3));

　　------解決方案--------------------

　　$a = array(

　　array("a" => "aa", "a1" => 1, "a2" => 1),

　　array("a" => "bb", "a1" => 2, "a2" => 2),

　　array("a" => "cc", "a1" => 3, "a2" => 3),

　　array("a" => "aa", "a1" => 1, "a2" => 1),

　　array("a" => "bb", "a1" => 5, "a2" => 5),

　　);

　　$res = array();

　　foreach($a as $r) {

　　if(! isset($res[$r['a']])) $res[$r['a']] = $r;

　　else {

　　$res[$r['a']]['a1'] += $r['a1'];

　　$res[$r['a']]['a2'] += $r['a2'];

　　}

　　}

　　print_r(array_values($res));

　　Array

　　(

　　[0] => Array

　　(

　　[a] => aa

　　[a1] => 2

　　[a2] => 2

　　)

　　[1] => Array

　　(

　　[a] => bb

　　[a1] => 7

　　[a2] => 7

　　)

　　[2] => Array

　　(

　　[a] => cc

　　[a1] => 3

　　[a2] => 3

　　)

　　)

http://www.bkjia.com/PHPjc/820411.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/820411.htmlTechArticlephp 基礎問題二維數組求和 ! 數組： $a = array(array(a=aa,a1=1,a2=1),array(a=bb,a1=2,a2=2),array(a=cc,a1=3,a2=3), array(a=aa,a1=1,a2=1),array(a=bb,a1=5,a2=5)) 第一個鍵...

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