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基本上，如果字段有值，我需要调用一个字段（包装在一个 div 中）。如果字段没有值，我不希望显示字段或 div。我的 PHP 知识很糟糕，但这是我必须使用的。

以下是提供给我的有关如何按 ID 调用自定义字段的说明：

$cust_1 = $this->fields->getFieldByCaption('Custom Text'); // getFieldByCaption() allow you to get the field by the Caption. This is not the best way to get a field since changing the caption in the back-end will break the reference.
echo '<br />Field ID: ' . $cust_1->getId();

$cust_2 = $this->fields->getFieldById(29);  // getFieldById() is the ideal way of getting a field. The ID can be found at 'Custom Fields' section in Mosets Tree's back-end.
echo '<br />Name: ' . $cust_2->getName();
echo '<br />Has Caption? ' . (($cust_2->hasCaption()) ? 'Yes' : 'No');
echo '<br />Caption: ' . $cust_1->getCaption();
echo '<br />Value: ' . $cust_2->getValue();
echo '<br />Output: ' . $cust_2->getOutput(1);
echo '<hr />';
$this->fields->resetPointer();
while( $this->fields->hasNext() ) {
$field = $this->fields->getField();
echo '<br /><strong>' . $field->getCaption() . '</strong>';
echo ': ';
echo $field->getOutput(1); // getOutput() returns the formatted value of the field. ie: For a youtube video, the youtube player will be loaded
// echo $field->getValue(); // getValue() returns the raw value without additional formatting. ie: When getting value from a Online Video field type, it will return the URL.
$this->fields->next();
}

这是我正在使用的代码，需要帮助来尝试执行我需要的操作，如上所述：

<?php
if( !is_null($this->fields->getFieldById(35)) ) {
$value = $field->getValue();
$hasValue = $field->hasValue();
$field = $this->fields->getField();

if( $hasValue )
{
    echo '<div class="lin" id="lphn">'; { 
    echo $cust_2 = $this->fields->getFieldById(35);
    echo $cust_2->getOutput(1); 
    echo '</div>';
}
else {
    // Print nothing.
}
}

}
?>
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