来自网址的PHP Preg_match图片

Question

I am trying to parse a website and grab the name or url of the image.

Example URL: http://www.theworkingmanstore.com/georgia-gr14-infants-romeo.aspx

There are 6 images or more in a single <td> and I only want to get the first img src in that <td> .

I am sure it can probably be done with Dom Parser, but I have no experience with it.

Any assistance would be appreciated.

Thanks

$html = file_get_contents($url);
$reg = '/img src=["\']?([^"\' ]*)["\' ]/';
preg_match_all($reg, $html, $m);
$arr = array_map(function($v){
return trim(str_replace(array('img src=', 'http://www.theworkingmanstore.com'), '', $v), '"');}, $m[0]);
print_r($arr)

Output: This is output from regex

Array
(
    [0] => /images/logo2.png
    [1] => /images/mod_head_category_lt.gif
    [2] => '/images/products/display/GR14_EXTRALARGE.jpg'
    [3] => '/images/products/thumb/GR14_EXTRALARGE.jpg'
    [4] => '/images/products/thumb/GR14_8_EXTRALARGE.jpg'
    [5] => '/images/products/thumb/GR14_5_EXTRALARGE.jpg'
    [6] => '/images/products/thumb/GR14_3_EXTRALARGE.jpg'
    [7] => '/images/products/thumb/GR14_42_EXTRALARGE.jpg'
    [8] => '/images/products/thumb/GR14_2_EXTRALARGE.jpg'
    [9] => /images/freeshipping.jpg
    [10] => /images/facebook_32.png
    [11] => images/twitter_32.png
    [12] => images/googleplus_32.png
    [13] => images/pinterest_32.png
    [14] => /images/payments.gif
    [15] => /images/brands/the-working-man.jpg
)

Tried the Dom Parser suggestion:

$html = file_get_contents($url) ;
$dom = new DOMDocument();
$dom->loadHtml($html);    
$xpath = new DOMXPath($dom);
echo $xpath->evaluate(
'string(//td/a[@id = "Zoomer"]/descendant::img[1]/@src)'
);

Got Error as output: Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Tag nav invalid in Entity

Answer 1

In DOM anything is a node, the img elements and the src attributes, too. XPath allows you to fetch nodes lists from a DOM.

$dom = new DOMDocument();
$dom->loadHtml($html);
$xpath = new DOMXPath($dom);
foreach ($xpath->evaluate('//img/@src') as $src) {
  echo $src->value, "\n";
}

Output:

http://www.theworkingmanstore.com/images/products/display/GR14_EXTRALARGE.jpg
http://www.theworkingmanstore.com/images/products/detail/GR14_EXTRALARGE.jpg
/images/products/thumb/GR14_EXTRALARGE.jpg
/images/products/thumb/GR14_8_EXTRALARGE.jpg
/images/products/thumb/GR14_5_EXTRALARGE.jpg
/images/products/thumb/GR14_3_EXTRALARGE.jpg
/images/products/thumb/GR14_42_EXTRALARGE.jpg
/images/products/thumb/GR14_2_EXTRALARGE.jpg

XPath allows quit complex conditions. The following examples outputs the src attributes of the first img inside any td .

$dom = new DOMDocument();
$dom->loadHtml($html);    
$xpath = new DOMXPath($dom);

foreach ($xpath->evaluate('//td/descendant::img[1]/@src') as $src) {
  echo $src->value, "\n";
}

Output:

http://www.theworkingmanstore.com/images/products/display/GR14_EXTRALARGE.jpg

The HTML in the question contains only a single td , and more important the img is inside an a element with an id attribute. So it has to be a single unique value. This allows it to cast the node list directly in XPath and return it as a string.

$dom = new DOMDocument();
$dom->loadHtml($html);    
$xpath = new DOMXPath($dom);
echo $xpath->evaluate(
  'string(//td/a[@id = "Zoomer"]/descendant::img[1]/@src)'
);

Output:

http://www.theworkingmanstore.com/images/products/display/GR14_EXTRALARGE.jpg

Answer 2

You can try using this regex.

$html = 'Your HTML';
$reg = '/img src=["\']?([^"\' ]*)["\' ]/';
preg_match_all($reg, $html, $m);
$arr = array_map(function($v){
    return trim(str_replace(array('img src=', 'http://www.theworkingmanstore.com'), '', $v), '"');
}, $m[0]);

print '<pre>';
print_r($arr);
print '</pre>';

Output:

Array
(
    [0] => /images/products/display/GR14_EXTRALARGE.jpg
    [1] => /images/products/detail/GR14_EXTRALARGE.jpg
    [2] => /images/products/thumb/GR14_EXTRALARGE.jpg
    [3] => /images/products/thumb/GR14_8_EXTRALARGE.jpg
    [4] => /images/products/thumb/GR14_5_EXTRALARGE.jpg
    [5] => /images/products/thumb/GR14_3_EXTRALARGE.jpg
    [6] => /images/products/thumb/GR14_42_EXTRALARGE.jpg
    [7] => /images/products/thumb/GR14_2_EXTRALARGE.jpg
)