如何在每5個結果後插入<br/>？

Question

這是我的代碼：

$query = mysql_query("SELECT * FROM books ORDER BY id") or die(mysql_error()); 
while($row = mysql_fetch_assoc($query)) { 
echo $row["bookname"]." - "; 
} 

如何使僅5中的每一行顯示的書籍，在開始插入
如果行是5或10或15等...

謝謝

Answer 1

你可以保持循環次數（每次增加一個變量）。

比較值模數5.如果結果爲0輸出的

$rowCounter = 1; 

while($row = mysql_fetch_assoc($query)) { 
    echo $row["bookname"]." - "; 

    if($rowCounter % 5 == 0) { 
     echo "<hr />"; 
    } 

    $rowCounter++; 
} 

Answer 2

一個簡單的辦法是有一個計數器增量...並檢查它的MOD（％）與5

所以

if (i % 5 == 0) echo $row["bookname"]; 

Answer 3

$query = mysql_query("SELECT * FROM books ORDER BY id") or die(mysql_error()); 
$counter=1; 
while($row = mysql_fetch_assoc($query)) { 
echo $row["bookname"]." - "; 
if($counter%5==0){echo "<br/>";} 
$counter++; 
} 

Answer 4

較短版本的邁克爾代碼：

$rowCounter = 0; 

while ($row = mysql_fetch_assoc($query)) { 
    echo $row["bookname"] . ' - '; 

    if (++$rowCounter % 5 == 0) { 
     echo '<br />'; 
    } 
} 

又一替代：

$rowCounter = 1; // not sure if this should be 1 or 0 
// 1 is correct, check comments 

while ($row = mysql_fetch_assoc($query)) { 
    echo $row["bookname"] . ' - '; 

    if ($rowCounter++ % 5 == 0) { 
     echo '<br />'; 
    } 
} 

Answer 5

michaels代碼的優化版本！ :)

$rowCounter = 0; 
$possibleHR = array("","","","","<hr/>"); 

while($row = mysql_fetch_assoc($query)) { 
    echo $row["bookname"]." - ".$possibleHR[($rowCounter++) % 5]; 
}