How to use substr() to cut a piece of code from tag to tag?

Question

PHP

How to cut out all the code that lies between the header and footer tags?

$str='
<header></header>
<p>content<p>
<footer></footer>'

Answer 1

Why bother with substrin this case and look for the position of the occurrence of characters in the string? You can pull it out regularly without problems:

$str='
<header></header>
<p>content<p>
<footer></footer>';

preg_match('#</header>(.*?)<footer>#s', $str, $m);
$content = $m[1];
echo $content; /* <p>content<p> */

Answer 2

Find the coordinates of these occurrences, substitute ... But it's best to master regular expressions, they are much easier.

Answer 3

Something like this

$start = stripos($str, '</header>' ) + strlen('</header>');
$end  = strripos($str, '<footer>');

$result = substr($str, $start, $end);