Dodawnie z tablicy wartości Opcje

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Mam o to taki szybkie pytanko

Posiadam tablicę

[PHP] pobierz, plaintext 
 
            [TwrKod] => 44444/BK/XS
            [Ilosc] => 1.0000
            [TwrKod] => 44444/BK/XS
            [Ilosc] => 3.0000
            [TwrKod] => 22222/CCC/XS
            [Ilosc] => 1.0000
            [TwrKod] =>111111/CCC/XS
            [Ilosc] => 3.0000
            [TwrKod] =>0000000/AA/XS
            [Ilosc] => 3.0000
            [TwrKod] =>0000000/AA/XS
            [Ilosc] => 3.0000
 
 
[PHP] pobierz, plaintext 

i finalnie potrzebuje to otrzymać :

[PHP] pobierz, plaintext 
 
 
            [TwrKod] => 44444/BK/XS
            [Ilosc] => 4.0000
            [TwrKod] => 22222/CCC/XS
            [Ilosc] => 1.0000
            [TwrKod] =>111111/CCC/XS
            [Ilosc] => 3.0000
            [TwrKod] =>0000000/AA/XS
            [Ilosc] => 6.0000
 
 
 
[PHP] pobierz, plaintext 

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