修改php只在元描述字段为空并且拉2个句子时运行（Magento）

Question

I have the following PHP code in Magento which so far takes the first sentence of the description and makes it the meta description.

<?php if (Mage::registry('current_product')) : ?>
<?php if (strip_tags(str_replace("<br />",", ",substr(Mage::registry('current_product')->getDescription(), 0, strpos(Mage::registry('current_product')->getDescription(), '.')+1)))=="") : ?>
<?php echo '<meta name="description" content="'.htmlspecialchars($this->getDescription()).'" />' ?>
<?php else: ?>
<?php echo '<meta name="description" content="'.strip_tags(str_replace("<br />",", ",substr(Mage::registry('current_product')->getDescription(), 0, strpos(Mage::registry('current_product')->getDescription(), '.')+1))).'" />' ?>
<?php endif; ?>
<?php else: ?>
<?php echo '<meta name="description" content="'.htmlspecialchars($this->getDescription()).'" />' ?>
<?php endif; ?>

I'm trying to do two things, modify it so that it only runs if the product is missing a manually set meta description, and make it pull the first 2 sentences instead of the first 1.

Impossible?

Answer 1

I'm trying to do two things, modify it so that it only runs if the product is missing a manually set meta description, and make it pull the first 2 sentences instead of the first 1. Impossible?

Yes, it's impossible. Because, if the product description is empty you simply can't pull two sentences from it. Not even one ;)

Notes:

• you don't need PHP tags on every line
• your if-syntax works, but is not common
• fetch the description only once, not 4 times from the registry
• compare with empty, to test if a description is set
• if not set, print "No Description."
• if set, get two sentences
• to fetch two sentences, i added the function teaser() it's from somewhere on SO

--

<?php
if (Mage::registry('current_product'))
{
    $metadescription = $this->description();        

    if ($metadescription === '') {
        $description = Mage::registry('current_product')->getDescription();
        $twoSentences = teaser($description, 2);

        echo '<meta name="description" content="'.htmlspecialchars($twoSentences).'" />';
    }
}

function teaser($body, $sentencesToDisplay = 2)
{
    $nakedBody = preg_replace('/\s+/',' ',strip_tags($body));
    $sentences = preg_split('/(\.|\?|\!)(\s)/',$nakedBody);

    if (count($sentences) <= $sentencesToDisplay)
        return $nakedBody;

    $stopAt = 0;
    foreach ($sentences as $i => $sentence) {
        $stopAt += strlen($sentence);

        if ($i >= $sentencesToDisplay - 1)
            break;
    }

    $stopAt += ($sentencesToDisplay * 2);

    return trim(substr($nakedBody, 0, $stopAt));
}