How to Extract Text Between HTML Headings in PHP?

PHP HTML Parsing: Extracting Text Between Headings

In PHP, parsing HTML code can be accomplished through various methods. When dealing with HTML stored in a variable, it's advisable to avoid regular expressions for reliability purposes.

Using PHP Document Object Model (DOM)

The PHP DOM provides a structured approach to parsing HTML:

$str = '<h1T1</h1>Lorem ipsum.<h1T2</h1>The quick red fox...<h1T3</h1>... jumps over the lazy brown FROG';
$DOM = new DOMDocument;
$DOM->loadHTML($str);
$items = $DOM->getElementsByTagName('h1');
for ($i = 0; $i < $items->length; $i++)
    echo $items->item($i)->nodeValue . "<br/>";

This will output:

T1
T2
T3

Alternative Approach: Regular Expression

If the desired output is the text between headings, a regular expression can be utilized:

$str = '<h1T1</h1>Lorem ipsum.<h1T2</h1>The quick red fox...<h1T3</h1>... jumps over the lazy brown FROG';
echo preg_replace("#<h1.*?>.*?</h1>#", "", $str);

This expression removes all HTML tags and retrieves the text:

Lorem ipsum.The quick red fox...... jumps over the lazy brown FROG

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