The preg_replace function in PHP is a powerful regular expression replacement function that can replace strings based on matching patterns.

The preg_replace function in PHP is a powerful regular expression replacement function that can replace strings based on matching patterns. In this article, I will introduce the usage of preg_replace function in detail and provide corresponding source code examples.

The basic syntax of the preg_replace function is as follows:

preg_replace(pattern, replacement, subject);

Among them, pattern is the regular expression pattern used for matching, replacement is the string or array used for replacement, and subject is the string to be replaced.

Here is a simple example showing how to use the preg_replace function to replace "world" with "PHP" in a string:

$string = "Hello, world!";
$pattern