How to get specific attribute of html in string using php?

Question

I got a string and I need to find out all the data-id numbers. This is the string

<li data-type="mentionable" data-id="2">bla bla... 
<li data-type="mentionable" data-id="812">some test 
<li>bla bla </li>more text 
<li data-type="mentionable" data-id="282">

So in the end It will find me this : 2,812,282

Possible duplicate of How do you parse and process HTML/XML in PHP? — chris85
– chris85, Commented Oct 26, 2016 at 15:55

Jan · Accepted Answer · 2016-10-26 16:28:50Z

3

Use DOMDocument instead:

<?php

$data = <<<DATA
<li data-type="mentionable" data-id="2">bla bla... 
<li data-type="mentionable" data-id="812">some test 
<li>bla bla </li>more text 
<li data-type="mentionable" data-id="282">
DATA;

$doc = new DOMDocument();
$doc->loadHTML($data, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

$xpath = new DOMXPath($doc);

$ids = [];
foreach ($xpath->query("//li[@data-id]") as $item) {
    $ids[] = $item->getAttribute('data-id');
}
print_r($ids);
?>

Which gives you 2, 812, 282, see a demo on ideone.com.

answered Oct 26, 2016 at 16:28

Jan

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Comments

Mohammad · Accepted Answer · 2016-10-26 16:23:43Z

1

You can use regex to find target part of string in preg_match_all().

preg_match_all("/data-id=\"(\d+)\"/", $str, $matches);
// $matches[1] is array contain target values
echo implode(',', $matches[1]) // return 2,812,282

See result of code in demo

Because your string is HTML, you can use DOMDocument class to parse HTML and find target attribute in document.

edited Oct 26, 2016 at 16:23

answered Oct 26, 2016 at 16:03

Mohammad

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2 Comments

chris85 Over a year ago

Implode would give desired output, echo implode(',', $matches[1]);.

Mohammad Over a year ago

@chris85 Good mention

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