extracting link from a string containing html and javascript

Question

I have a string that contains the following:

<img data-bind="defaultSrc: {srcDesktop: 'http://desktoplink', srcMobile: 'http://mobilelink', fallback: 'http://baseurl'}" >

I am trying to extract the srcDesktop contained inside the string. I want my final result to yield me with the link http://desktoplink. What is the best way to achieve that other than str_replace? I have a dataset that contains those strings so I am looking for a formula to extract it in php.

Here is how I have been doing it, but there is got to be a more efficient way:

$string = '<img data-bind="defaultSrc: {srcDesktop: \'http://desktoplink\', srcMobile: \'http://mobilelink\', fallback: \'http://baseurl\'}" >';
$test = explode(" ",$string);
echo "<br>".str_replace(",","",str_replace("'","",$test['3']));

Your string is invalid; it will read "<img data-bind=" and then throw a syntax error. You need to escape your quotation marks. — Obsidian Age
– Obsidian Age, Commented Sep 11, 2017 at 23:11
@shnisaka I have updated my answer. Added "i" modificator for case insensitivity and \b to determine srcDesktop left word boundary. — Talgat
– Talgat, Commented Sep 12, 2017 at 1:25

Talgat · Accepted Answer · 2017-09-12 01:14:26Z

1

You can use preg_match

$string = '<img data-bind="defaultSrc: {srcDesktop: \'http://desktoplink\', srcMobile: \'http://mobilelink\', fallback: \'http://baseurl\'}" >';

preg_match('/.*\bsrcDesktop:\s*(?:\'|\")(.*?)(?:\'|\").*/i', $string, $matches);

if (isset($matches[1])) {
    echo trim($matches[1]);
}

edited Sep 12, 2017 at 1:14

answered Sep 12, 2017 at 0:58

Talgat

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Joshua K · Accepted Answer · 2017-09-11 23:33:33Z

1

you can use DOMDocument and json_decode to get this value, if you can change the code to the code below (added some '-signs):

$string = "<img data-bind=\"'defaultSrc': {'srcDesktop': 'http://desktoplink', 'srcMobile': 'http://mobilelink', 'fallback': 'http://baseurl'}\" >";
$doc = new DOMDocument();
$doc->loadHTML($string);
$data = str_replace('\'','"',$doc->getElementsByTagName('img')[0]->getAttribute('data-bind'));
$json = json_decode('{'.$data.'}');
var_dump($json->defaultSrc->srcDesktop);

edited Sep 11, 2017 at 23:33

answered Sep 11, 2017 at 23:17

Joshua K

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4 Comments

syrkull Over a year ago

Notice: Trying to get property of non-object in test.php on line 7 NULL

Joshua K Over a year ago

@shnisaka my bad. Fixed it. I missed the missing quotes at srcMobile and fallback. Is it an option for you to add them? I build json compatible syntax from your code... it would be better if you save a json string instead of something that looks a little bit like json. Then it's a little bit simpler ;)

syrkull Over a year ago

your code is working now. Thank you for your contribution.. the method I am using is pulling faster at the moment. But I am willing to see other ideas. Yours is much more organized and can pull whatever you want with few changes.

Joshua K Over a year ago

@shnisaka yes. And it's tougher (safer). It will also work if there are more spaces or if srcDesktop is not the first noted key. What happens in your code if the url contains a comma? (it's valid in urls) You're perhaps changing the urls in the way you chose. and so on.

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