PHP正则表达式preg_replace函数Joomla！ 插入

Question

I want to create plugin that finds and replaces phone numbers with a linked number for mobile. This is a php function that I have written for Joomla to use to replace a phone number...

protected function clickToCall(&$text, &$params){
    // phone number pattern...
    $pattern = '~(\+0?1\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}~';
    //replacement pattern...
    $replacement = '<a href="tel:$1$2">$1$2</a>';
    //use preg_replace to actually replace the pattern
    $text = preg_replace($pattern, $replacement, $text);
    //return the new value
    return true;
}

Right now the function finds the pattern and just replaces it with an empty link. How can insert the phone number found by regex into a link?

Answer 1

The problem is that you are using $1 and $2 backreferences that refer to Group 1 (i.e. substring captured with (\+0?1\s)?) and non-existent Group 2 (thus, it is an empty string) rather than to the whole match (that can be referred to with the help of $0 or \0).

Here is a fix:

$text = 'Phone [phone] to obtain a free copy.';
$pattern = '~(\+0?1\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}~';
$replacement = '<a href="tel:$0">$0</a>';
echo $text = preg_replace($pattern, $replacement, $text);

See IDEONE demo

See more about Back references in PHP Manual.