我可能忽略了一个简单的原因，但是我的第二个if语句（其大小为sizeof（$ duplicate）> 0的条件）无法正常运行。尽管我已验证$ duplicate的大小实际上为0，并且在段落标记下没有任何列表，但html块仍在显示。我想念什么吗？
<html>
<head>
</head>
<body>
<?php echo (sizeof($duplicate)); ?>
<?php if(sizeof($not_exist > 0)) : ?>
<p>The following companies were not updated because their Company Name did not exist in database: </p>
<ul>
<?php foreach($not_exist as $entry) {
echo "<li>Company Name: " . $entry . "</li>";
}
?>
</ul>
<?php endif; ?>
<?php if(sizeof($duplicate > 0)) : ?>
<p>The following companies had more than 1 entry under the same Company Name in database:</p>
<ul>
<?php foreach($duplicate as $entry) {
echo "<li>Company Name: " . $entry . "</li>";
}
?>
</ul>
<?php endif; ?>
<?php if(sizeof($failed > 0)) : ?>
<p>The following companies were not updated because the new Display Name already exists in QuickBooks:</p>
<ul>
<?php foreach($failed as $entry) {
echo "<li>Company Name: " . $entry . "</li>";
}
?>
</ul>
<?php endif; ?>
</body>
谢谢！
<?php if(sizeof($duplicate )>0) : ?>
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