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PHP basics related issues: summation of two-dimensional arrays_PHP tutorial

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2016-07-13 10:27:231011browse

PHP basic problem of summing two-dimensional arrays!

Array:

 $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))

Sum the first element with the same key value

Results

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

 ------Solution--------------------

 $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

 )

 )

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/820411.htmlTechArticlephp Basic problem of two-dimensional array summation! Array: $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)) The first key...
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