當循環開始時Php總和值一次

Question

嗨我有一個變量值我想在循環開始時不是總是第一次添加這個值。例如

<?php 

    $balance = 100; 
    while($row = mysql_fetch_array($query) 
    { 
     echo $row['amount'] + $balance; // for example $row['amount'] is 50, 20 , 30; 
    } 
?> 

我想導致如下

<?php  

    150 
    170 
    200 

?> 

Answer 1

示例代碼..

$balance = 100; 
$counter=1; 
$total=0; 
while($row = mysql_fetch_array($query) 
{ 
    if($counter==1) 
    { 
     $total=$row['amount'] + $balance; // for example $row['amount'] is 50, 20 , 30; 
    } 
    else 
    { 
     $total = $row['amount']+$total; 
    } 

    echo $total.'<br>'; 

    $counter++; 
} 

Answer 2

最簡單的方式這樣做

<?php 

    $balance = 100; 
    while($row = mysql_fetch_array($query) 
    { 
     $balance = $balance + $row['amount']; 
     echo $balance; 
    } 
?>