印刷只能從我的DB值，而不是diplaying空值

Question

本人菜鳥到PHP，我想每一行中使用foreach語句，以顯示沒有空值，代碼如下，您的支持將不勝感激

<?php 

     foreach ($customer['Stocks'] as $stock) { ?> 
     <tr> 
      <td><?php echo $stock['stsymbol']?><td> 
      <td><?php echo $stock['noshares']?><td> 
      <td><?php echo $stock['purchaseprice']?><td> 
      <td><?php echo $stock['datepurchased']?><td> 
      <td><?php echo $stock['Original Value']; ?><td> 
      <td><?php echo $stock['Current Price'];?><td> 
      <td><?php echo $stock['Current Value']?><td> 
<?php } // end foreach ?> 

Answer 1

<td><?= strlen($stock['stsymbol'])!==0? $stock['stsymbol'] : '-' ?><td> 

我替換這是你的迴音，這是短期的方法：

// These do the same: 
<td><?php echo $something; ?></td> 
<td><?= $something ?></td> 

然後在回聲我做了一個簡短的if/else（三元），它是這樣工作的：代替strlen($var)!==0的

if(strlen($var)===0){ echo 'true'; } else{ echo 'false'; } 
echo strlen($var)===0)? 'true' : 'false'; 
// (condition) ? (if true) : (if false); 

，你也可以做isset($var)的$var===NULL

Answer 2

使用三元運算，以顯示你的 「空」 值，否則一個空字符串：

<?php 
    foreach ($customer['Stocks'] as $stock) { ?> 
    <tr> 
     <td><?php echo ($stock['stsymbol'] == NULL) ? $stock['stsymbol'] : ''; ?></td> 
     <td><?php echo ($stock['noshares'] == NULL) ? $stock['noshares'] : ''; ?></td> 
     <td><?php echo ($stock['purchaseprice'] == NULL) ? $stock['purchaseprice'] : ''; ?></td> 
     <td><?php echo ($stock['datepurchased'] == NULL) ? $stock['datepurchased'] : ''; ?></td> 
     <td><?php echo ($stock['Original Value'] == NULL) ? $stock['Original Value'] : ''; ?></td> 
     <td><?php echo ($stock['Current Price'] == NULL) ? $stock['Current Price'] : ''; ?></td> 
     <td><?php echo ($stock['Current Value'] == NULL) ? $stock['Current Value'] : ''; ?></td> 
    </tr> 
<?php } // end foreach ?> 

希望你得到的想法

Answer 3

你可以像這樣走過陣列：

foreach($customer['stocks'] as $key => $value) { 

    if(empty($value)) { 

     $customer['stocks'][$key] = '-'; 


    } 

} 

讓你的顯示器的代碼更好的可讀性：

foreach ($customer['Stocks'] as $stock) { 

    echo('<tr> 
     <td>'.$stock['stsymbol'].'<td> 
     <td>'.$stock['noshares'].'<td> 
     <td>'.$stock['purchaseprice'].'<td> 
     <td>'.$stock['datepurchased'].'<td> 
     <td>'.$stock['Original Value'].'<td> 
     <td>'.$stock['Current Price'].'<td> 
     <td>'.$stock['Current Value'].'<td> 
    </tr>'); 

} 

Answer 4

<?php 
    foreach ($customer['Stocks'] as $stock) { 
     if(! empty($stock['stsymbol'])){ ?> 
     <tr> 
      <td><?php echo $stock['stsymbol']?><td> 
      <td><?php echo $stock['noshares']?><td> 
      <td><?php echo $stock['purchaseprice']?><td> 
      <td><?php echo $stock['datepurchased']?><td> 
      <td><?php echo $stock['Original Value']; ?><td> 
      <td><?php echo $stock['Current Price'];?><td> 
      <td><?php echo $stock['Current Value']?><td> 
     </tr> 
<?php 
     } // end if 
    } // end foreach ?>