如何計算在PHP數組

嗨具體數值我有數組是這樣的：如何計算在PHP數組

0 => 
    array (size=6) 
     'id' => string '55' (length=2) 
     'uid' => string '1' (length=1) 
     'item_id' => string '5' (length=1) 
     'item_name' => string 'dfgdfg' (length=6) 
     'price' => string '14.91' (length=5) 
     'time' => string '1373975023' (length=10) 
    1 => 
    array (size=6) 
     'id' => string '59' (length=2) 
     'uid' => string '1' (length=1) 
     'item_id' => string '5' (length=1) 
     'item_name' => string 'dfgdfg' (length=6) 
     'price' => string '14.91' (length=5) 
     'time' => string '1373978756' (length=10) 
    2 => 
    array (size=6) 
     'id' => string '58' (length=2) 
     'uid' => string '1' (length=1) 
     'item_id' => string '6' (length=1) 
     'item_name' => string 'kubek #1' (length=8) 
     'price' => string '10.01' (length=5) 
     'time' => string '1373978751' (length=10) 
    3 => 
    array (size=6) 
     'id' => string '56' (length=2) 
     'uid' => string '1' (length=1) 
     'item_id' => string '7' (length=1) 
     'item_name' => string 'ewr' (length=3) 
     'price' => string '1.05' (length=4) 
     'time' => string '1373975032' (length=10)

，我需要把這個數組是這樣的：

 0 => 
    array (size=6) 
     'id' => string '59' (length=2) 
     'uid' => string '1' (length=1) 
     'item_id' => string '5' (length=1) 
     'item_name' => string 'dfgdfg' (length=6) 
     'price' => string '14.91' (length=5) 
     'time' => string '1373978756' (length=10) 
     'q' => 2 

    1 => 
    array (size=6) 
     'id' => string '58' (length=2) 
     'uid' => string '1' (length=1) 
     'item_id' => string '6' (length=1) 
     'item_name' => string 'kubek #1' (length=8) 
     'price' => string '10.01' (length=5) 
     'time' => string '1373978751' (length=10) 
     'q' => 1 
    2 => 
    array (size=6) 
     'id' => string '56' (length=2) 
     'uid' => string '1' (length=1) 
     'item_id' => string '7' (length=1) 
     'item_name' => string 'ewr' (length=3) 
     'price' => string '1.05' (length=4) 
     'time' => string '1373975032' (length=10) 
     'q' => 1

需要算多少特定值進入陣列並將它們放入新陣列。這時我嘗試做這樣，但它不會。如果您使用的是數據庫的工作很好

foreach ($b as $k => $v) { 
     $bas[$k]['q'] = array_count_values($v['item_id']); 
    }

來源

2013-07-16 DorienCragen

是這些值從數據庫中來？你可以使用'GROUP BY item_id'然後.. – Pieter

不錯的一個我沒有考慮它，使用count（item_id）作爲q和你說group_ item_id，非常感謝 – DorienCragen

不客氣。我會發布它是一個答案，然後其他人可以使用它。 – Pieter

，您可以使用此查詢：

SELECT *, count(item_id) AS quantity FROM table GROUP BY item_id

來源

2013-07-16 13:12:38 Pieter

如何計算在PHP數組

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