How to use PHP7 preg_replace

This article mainly introduces "how to use PHP7 preg_replace". In daily operation, I believe many people have doubts about how to use PHP7 preg_replace. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use PHP7 preg_replace". Next, please follow the editor to study!

Problem description:

PHP7 abandoned preg_replace?

It was originally cleared in php5 to handle the later parameter substitution in url, as follows

$url = preg_replace ('/ ([? &]) src= [^ &] + (&?) / eBay,'"$2" = = "?": "$1", $url)

But the error was reported in php7.

I need to replace it with preg_replace_callback. What should I do?

Related code

$url = preg_replace ('/ ([? &]) src= [^ &] + (&?) / eBay,'"$2" = = "?": "$1", $url)

Problem analysis:

The e modifier has been marked as content to be removed since 5.3 because of security concerns.

Instead, it is replaced by preg_replace_callback. The second parameter of this method is a callback function, which automatically passes in the matching packet as the parameter. The matching group is accessed through the array subscript inside the callback function. (the mobile phone codeword is not formatted)

Preg_replace_callback ('/ ([? &]) src= [^ &] + (&?) /', function ($matches) {return $matches [2] = = "?": $matches [1];}, $url); at this point, the study on "how to use PHP7 preg_replace" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!