Getting one tag from string?

Question

I have this kind of string

$string='Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type <img src="http://www.yourwebite.com/images/assets/livechat-off.png" alt="Our products"/> and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.<img src="http://www.yourwebite.com/images/youareon.jpg" alt="Our products"/>the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic';

What i want is to take first img from $string and to get new string like this

$newstring='<img src="http://www.yourwebite.com/images/assets/livechat-off.png" alt="Our products"/>';

That way i can take just one picture from string and display it anywhere, is taht possible?

Tried strip_tags($string, '<img>'); but that way i got all IMG tags, i just want one from string, maybe random, does not to be the first :)

Just made function with help of PeeHaa, txanks mate :)

public function getimagefromstring($string) 

{
 $dom = new DOMDocument();
    // load the string as an HTML document
    $dom->loadHTML($string);

    $xpath = new DOMXPath($dom);

    // match the first image tag found in the document
    $node = $xpath->query('//img[1]');

    // no images found
    if (!$node->length) {
        $image='Hello World';
    }

    else 
    {
    // build the image attributes
    $attrs = '';
    if ($node->item(0)->hasAttributes()) {
        foreach ($node->item(0)->attributes as $attribute) {
            $attrs.= ' ' . $attribute->name . '="' . $attribute->value . '"';
        }
    }
    // display the image
    $image='<img' . $attrs . '>';   
    }

    return $image;   
}

What have you tried? Do you think you need a regexp or will a simple strpos/substr suffice? — Halcyon
– Halcyon, Commented Aug 6, 2013 at 9:33
Tried strip_tags($string, '<img>'); but that way i got all IMG tags, i just want one from string, maybe random, does not to be the first :) — Miomir Dancevic
– Miomir Dancevic, Commented Aug 6, 2013 at 9:35

PeeHaa · Accepted Answer · 2013-08-06 09:59:48Z

2

This is easy to do with the DOM and XPath classes in PHP:

<?php

function getImage($html)
{
    $dom = new DOMDocument();
    // load the string as an HTML document
    $dom->loadHTML($html);

    $xpath = new DOMXPath($dom);

    // match the first image tag found in the document
    $node = $xpath->query('//img[1]');

    // no images found
    if (!$node->length) {
        return '<img src="myimage">';
    }

    // build the image attributes
    $attrs = '';
    if ($node->item(0)->hasAttributes()) {
        foreach ($node->item(0)->attributes as $attribute) {
            $attrs.= ' ' . $attribute->name . '="' . $attribute->value . '"';
        }
    }

    // display the image
    return '<img' . $attrs . '>';
}

$stringWithImage ='Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry\'s standard dummy text ever since the 1500s, when an unknown printer took a galley of type <img src="http://www.yourwebite.com/images/assets/livechat-off.png" alt="Our products"/> and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.<img src="http://www.yourwebite.com/images/youareon.jpg" alt="Our products"/>the industry\'s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic';

$stringWithoutImage = 'Just some random string';

echo getImage($stringWithImage) . "\r\n";
echo getImage($stringWithoutImage) . "\r\n";

Demo: https://eval.in/40828

edited Aug 6, 2013 at 9:59

answered Aug 6, 2013 at 9:42

PeeHaa

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4 Comments

Miomir Dancevic Over a year ago

This works great, but i have problem, what if string does not have <img> tag then i got error, i want to prevent that :( And if string i dont have <img> i want to use my custom image like <img src="myimage">

Miomir Dancevic Over a year ago

Txanks, you are the greatest :)

Miomir Dancevic Over a year ago

it is ok, but the problem is i dont know is there <img> tag in string or not?

PeeHaa Over a year ago

Have you tried my solution? Because it checks whether there is an image in the string and fallbacks otherwise.

m1k1o · Accepted Answer · 2013-08-06 09:40:52Z

0

You can use preg_match to find tag.

preg_match('/(<img[^>]+>)/i', $str, $matches)

the string contains attributes: $matches[1]

now separate src from other tags

preg_match('/(src="[^"]+")/i', $matches[1], $matches)

the string contains url: $matches[1]

answered Aug 6, 2013 at 9:40

m1k1o

2,36416 silver badges27 bronze badges

Comments

Sohail Ahmed · Accepted Answer · 2013-08-06 10:20:23Z

0

The following function will save your lot of time. Must try it

 function extractor($str,$from,$to)
 {
      $from_pos = strpos($str,$from);
      $from_pos = $from_pos + strlen($from);
      $to_pos   = strpos($str,$to,$from_pos);// to must be after from
      $return   = substr($str,$from_pos,$to_pos-$from_pos);
      unset($str,$from,$to,$from_pos,$to_pos );           
      return $return;

}   

$extracted_str = extractor($string,"<img","/>");

echo "<img" . $extracted_str . "/>";

edited Aug 6, 2013 at 10:20

answered Aug 6, 2013 at 10:05

Sohail Ahmed

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2 Comments

PeeHaa Over a year ago

The above looks very brittle.

PeeHaa Over a year ago

I meant brittle like this will break often.

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