<?php
$result = [
'h1' => [
'title' => 'First title',
'content' => '<p>Hello world</p>'
],
'h2' => [
'title' => 'Second title',
'content' => '<p><a>Hello world 2</a></a>'
]
];
<?php
$html = file_get_contents('https://toster.ru');
$headers = [];
for($h = 1; $h <= 6; $h++)
{
preg_match_all('!<h'.$h.'.*?>(.*?)</h'.$h.'!usi', $html, $out);
if(isset($out[1]) && !empty($out[1]))
{
$headers["H".$h] = array_map('trim', $out[1]);
}
}
print_r($headers);