<?php
$html = <<< HTML
<article id="p73" class="p-quote">
Albert Einstein’s Quotes Collection
<blockquote><p>Life is like riding a bicycle. To keep your balance, you must keep moving.</p></blockquote>
<blockquote><p>Pure mathematics is, in its way, the poetry of logical ideas.</p></blockquote>
<blockquote><p>Education is what remains after one has forgotten what one has learned in school.</p></blockquote>
<blockquote><p>Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.</p></blockquote>
<blockquote><p>Logic will get you from A to B. Imagination will take you everywhere.</p></blockquote>
<blockquote><p>If you can’t explain it simply, you don’t understand it well enough.</p></blockquote>
<blockquote><p>The difference between stupidity and genius is that genius has its limits.</p></blockquote>
</article>
HTML;
class ExtractTag {
private $doc = null;
public function __construct($html) {
$this->doc = new DomDocument();
$content = mb_convert_encoding(
$html,
'HTML-ENTITIES',
'UTF-8'
);
@$this->doc->loadHTML($content);
}
private function getFirstTag($tag) {
$elements = $this->doc->getElementsByTagName($tag);
if (!$elements->count()) {
throw new Exception('no elements found');
}
return $elements->item(0);
}
private function printFirstTag($tag) {
$firstTag = $this->getFirstTag($tag);
echo $this->doc->saveHTML($firstTag);
}
public function print_image() {
$this->printFirstTag('img');
}
public function print_quote() {
$this->printFirstTag('blockquote');
}
}
$dom = new ExtractTag($html);
echo $dom->print_quote(); #Expect to see a <blockquote>
echo $dom->print_image(); #Expect to see nothing since there is no <img> tag in the html!
Deprecated: mb_convert_encoding(): Handling HTML entities via mbstring is deprecated; use htmlspecialchars, htmlentities, or mb_encode_numericentity/mb_decode_numericentity instead in /in/Pluib on line 20
<blockquote><p>Life is like riding a bicycle. To keep your balance, you must keep moving.</p></blockquote>
Fatal error: Uncaught Exception: no elements found in /in/Pluib:31
Stack trace:
#0 /in/Pluib(36): ExtractTag->getFirstTag('img')
#1 /in/Pluib(41): ExtractTag->printFirstTag('img')
#2 /in/Pluib(51): ExtractTag->print_image()
#3 {main}
thrown in /in/Pluib on line 31
Process exited with code 255.
<blockquote><p>Life is like riding a bicycle. To keep your balance, you must keep moving.</p></blockquote>
Fatal error: Uncaught Exception: no elements found in /in/Pluib:31
Stack trace:
#0 /in/Pluib(36): ExtractTag->getFirstTag('img')
#1 /in/Pluib(41): ExtractTag->printFirstTag('img')
#2 /in/Pluib(51): ExtractTag->print_image()
#3 {main}
thrown in /in/Pluib on line 31
Process exited with code 255.
Output for 7.1.25 - 7.1.30
Fatal error: Uncaught Error: Call to undefined method DOMNodeList::count() in /in/Pluib:30
Stack trace:
#0 /in/Pluib(36): ExtractTag->getFirstTag('blockquote')
#1 /in/Pluib(44): ExtractTag->printFirstTag('blockquote')
#2 /in/Pluib(50): ExtractTag->print_quote()
#3 {main}
thrown in /in/Pluib on line 30
Process exited with code 255.