- array_push: documentation ( source)
- var_dump: documentation ( source)
- preg_match: documentation ( source)
- preg_split: documentation ( source)
- array_pop: documentation ( source)
<?php
function validateHtml($html)
{
$stack = array();
$tags = preg_split("/(<[^>]+>)/", $html, -1, PREG_SPLIT_DELIM_CAPTURE);
foreach ($tags as $tag) {
if (preg_match("/^<\/\s*([^\s>]+)\s*>$/", $tag, $matches)) {
// closing tag
$last = array_pop($stack);
if (!$last || $last !== $matches[1]) {
return false;
}
} elseif (preg_match("/^<\s*([^\s>]+)(\s+[^>]+)?\s*>$/", $tag, $matches)) {
// opening tag
array_push($stack, $matches[1]);
}
}
return count($stack) === 0;
}
// example usage
$html = "<div><p>Some text</p></div>";
var_dump(validateHtml($html)); // true
$html = "<div><p>Some text</div>";
var_dump(validateHtml($html)); // false
$html = "<div><p>Some text</p><span></span></div>";
var_dump(validateHtml($html)); // true
$html = "<div><p>Some text<span></p></span></div>";
var_dump(validateHtml($html)); // false