合併數組數量PHP

Question

這是我的工作代碼：

while ($list = mysql_fetch_assoc($result)) { 
$sql2 = "SELECT * FROM stock WHERE gID=".$list['gID']; 
$result2 = mysql_query($sql2, $conn) or trigger_error("SQL", E_USER_ERROR); 
$totalgid = mysql_num_rows($result2); 
$sql3 = "SELECT * FROM stockcount WHERE gID=".$list['gID']." AND date='".$list['date']."' AND affectstock=1"; 
$result3 = mysql_query($sql3, $conn) or trigger_error("SQL", E_USER_ERROR); 
$dategid = mysql_num_rows($result3); 
$calculategid = $totalgid - $dategid; 
    if ($calculategid < 0) { 

    if(isset($arr[$list['date']][$list['gID']])){ 
    //increment 
} else { 
    //set to initial value of 1 
    $arr[$list['date']][$list['gID']]=$calculategid; 
} 

    } 

} 
print_r($arr); 

Answer 1

你有沒有超出這個一個循環，是像foreach($someList as $list){ ...do this code... }？我只問，因爲你不應該有重複的值，因爲如果你試圖設置一個值到相同的確切的關鍵，將覆蓋以前的值。我只能根據你發佈的代碼假設你將這個數組附加到循環中的另一個數組。如果是這樣的話，這樣的事情可能會有所幫助：

//initialize the output array 
$arr = array(); 
//loop through somelist 
foreach($someList as $list){ 
    //check if the key exists, if so increment. 
    if(isset($arr[$list['date']][$list['gID']])){ 
     //increment 
     $arr[$list['date']][$list['gID']]++; 
    } else { 
     //set to initial value of 1 
     $arr[$list['date']][$list['gID']]=1; 
    } 
} 
print_r($arr); 

本質，只是檢查關鍵isset()如果是這樣，增量，如果沒有設置爲1