PHP Find / Extract Substrings

There are several ways to find and extract substrings in PHP. Here are some examples:

• The substr function returns a portion of a string. You can use it to extract a substring by specifying the starting position and the length of the substring. For example:

$string = 'Hello, world!';
$substring = substr($string, 7, 5); // Returns 'world'

• The strpos function returns the position of the first occurrence of a substring within a string. You can use it to find the starting position of a substring and then use substr to extract it. For example:

$string = 'Hello, world!';
$position = strpos($string, 'world'); // Returns 7
$substring = substr($string, $position, 5); // Returns 'world'

• The preg_match function searches a string for a pattern and returns the matches as an array. You can use it to extract substrings that match a regular expression pattern. For example:

$string = 'Hello, world!';
preg_match('/world/', $string, $matches);
$substring = $matches[0]; // Returns 'world'

It's important to note that these are just a few examples of how to find and extract substrings in PHP. There are many other functions and techniques that you can use depending on your specific requirements.