這條線覆蓋陣列

Question

好吧，所以我正在創建一個multidementional數組，這條線只允許一個元素進入它。我如何檢查，看看是否

$related[$row_r['Category_name']][$row_r['name']] 

是大於0，如果是不覆蓋的價值，只是追加到它

while($row_r = mysql_fetch_assoc($result)){ 
    $related[$row_r['Category_name']][$row_r['name']] = $row_r; //this line 

Answer 1

也許你正在尋找呢？

while($row_r = mysql_fetch_assoc($result)){ 
    $related[$row_r['Category_name']][$row_r['name']][] = $row_r; 
} 

Answer 2

$value=$related[$row_r['Category_name']][$row_r['name']]; 
if(is_int($value) && $value>0) {//if current value is a >0 integer 
    $related[$row_r['Category_name']][$row_r['name']] = array($value, $new_value);//we combine the new value too, together with the previous one, into an array 
} elseif(is_array($value)) {//if it was already an array, we append the new element 
    $related[$row_r['Category_name']][$row_r['name']][] = $new_value; 
} else {//other wise (a 0 integer), we would assign the value. 
    $related[$row_r['Category_name']][$row_r['name']] = $new_value; 
}