Regex & PHP - isolate src attribute from img tag

Question

With PHP, how can I isolate the contents of the src attribute from $foo? The end result I\'m looking for would give me just \"http://example.com/img/image.jpg\"

Answer 1

I'm extremely late to this, but I have a simple solution not yet mentioned. Load it with simplexml_load_string (if you have simplexml enabled) and then flip it through json_encode and json_decode.

$foo = '<img class="foo bar test" title="test image" src="http://example.com/img/image.jpg" alt="test image" width="100" height="100" />';

$parsedFoo = json_decode(json_encode(simplexml_load_string($foo)), true);
var_dump($parsedFoo['@attributes']['src']); // output: "http://example.com/img/image.jpg"

$parsedFoo comes through as

array(1) {
  ["@attributes"]=>
  array(6) {
    ["class"]=>
    string(12) "foo bar test"
    ["title"]=>
    string(10) "test image"
    ["src"]=>
    string(32) "http://example.com/img/image.jpg"
    ["alt"]=>
    string(10) "test image"
    ["width"]=>
    string(3) "100"
    ["height"]=>
    string(3) "100"
  }
}

I've been using this for parsing XML and HTML for a few months now and it works pretty well. I've had no hiccups yet, though I haven't had to parse a large file with it (I imagine using json_encode and json_decode like that will get slower the larger the input gets). It's convoluted, but it's by far the easiest way to read HTML properties.

Answer 2

I got this code:

$dom = new DOMDocument();
$dom->loadHTML($img);
echo $dom->getElementsByTagName('img')->item(0)->getAttribute('src');

Assuming there is only one img :P

Answer 3

// Create DOM from string
$html = str_get_html('<img class="foo bar test" title="test image" src="http://example.com/img/image.jpg" alt="test image" width="100" height="100" />');

// echo the src attribute
echo $html->find('img', 0)->src;

http://simplehtmldom.sourceforge.net/

Answer 4

You can go around this problem using this function:

function getTextBetween($start, $end, $text)
{
 $start_from = strpos($text, $start);
 $start_pos = $start_from + strlen($start);
 $end_pos = strpos($text, $end, $start_pos + 1);
 $subtext = substr($text, $start_pos, $end_pos);
 return $subtext;
}

$foo = '<img class="foo bar test" title="test image" 
src="http://example.com/img/image.jpg" alt="test image"
width="100" height="100" />';

$img_src = getTextBetween('src="', '"', $foo);

Answer 5

Here's what I ended up doing, although I'm not sure about how efficient this is:

$imgsplit = explode('"',$data);
foreach ($imgsplit as $item) {
    if (strpos($item, 'http') !== FALSE) {
        $image = $item;
        break;
    }
}

Answer 6

If you don't wish to use regex (or any non-standard PHP components), a reasonable solution using the built-in DOMDocument class would be as follows:

<?php
    $doc = new DOMDocument();
    $doc->loadHTML('<img src="http://example.com/img/image.jpg" ... />');
    $imageTags = $doc->getElementsByTagName('img');

    foreach($imageTags as $tag) {
        echo $tag->getAttribute('src');
    }
?>