如何判断当前结果是否是PHP中的最后结果

Question

I've got a new online store written in PHP and MySQL.

<div class="content-area">
<div class="page-heading">
<h1>Store</h1>
</div>
<p style="padding-top: 5px;"><strong>You are here:</strong> <a href="<?php echo $cls->root(); ?>/">Home</a> &raquo; Store</p>
<table border="0" cellpadding="0" cellspacing="0" width="500">
<?php
$categories=mysql_query("SELECT * FROM categories WHERE parent='0' ORDER by owner ASC, title ASC");
while($categoriesRow=mysql_fetch_array($categories)) {
$categoriesSub=mysql_query("SELECT * FROM categories WHERE parent='$categoriesRow[id]'");
?>
<tr>
<td valign="top">
<div class="product_list">
<div class="image_product">
<img alt="<?php echo $categoriesRow['title']; ?>" src="<?php echo $cls->truska(true); ?>/theme_section_image.gif" border="0" style="vertical-align: middle;" />
</div>
<div>
<h3 class="product"><a href="<?php echo $cls->root(); ?>/category/<?php echo $categoriesRow['permalink']; ?>/" target="_self"><?php echo $categoriesRow['title']; ?></a> <?php if(mysql_num_rows($categoriesSub) > 0) { ?>(<?php while($categoriesSubRow=mysql_fetch_array($categoriesSub)) {  }?>)<?php } ?></h3>
</div>
</div>
</td>
</tr>
<tr>
<td class="dotted_line_blue" colspan="1">
<img src="<?php echo $cls->truska(true); ?>/theme_shim.gif" height="1" width="1" alt=" " />
</td>
</tr>
<?php
}
?>
</table>
</div>

Where my second While loop is, I need to work out what is the last result, so I can omit a comma from my while loop.

It will show as 'Lego (Lego City, Lego Starwars,)' but I want it to show as 'Lego (Lego City, Lego Starwars)'.

How can I get if the current result is the last?

Answer 1

You can fix this by coming at it from the other direction.

Instead of appending a comma after each result except the last, try pre-pending a comma on every result except the first.

Set up a variable called $first outside your loop, and set it to 1. Inside the loop:

if ($first == 0) {
   echo ",";
} else {
    $first = 0;
}