getting all values from h1 tags using php

Question

I want to receive an array that contains all the h1 tag values from a text

Example, if this where the given input string:

hello
         


        

Answer 1

Alternative to DOM. Use when memory is an issue.

$html = <<< HTML

helloworld
random text
title number two!

HTML;

$reader = new XMLReader;
$reader->xml($html);
while($reader->read() !== FALSE) {
    if($reader->name === 'h1' && $reader->nodeType === XMLReader::ELEMENT) {
        echo $reader->readString();
    }
}