how to remove one image in string via php dom - php

Question

I have an string with some <img> in it.
$string = ' <img src="pic.jpg"> and <img src="pic2.jpg">';
$doc = new DOMDocument('1.0', 'UTF-8');
libxml_use_internal_errors(true);
$doc->loadHTML(mb_convert_encoding($string, 'HTML-ENTITIES', 'UTF-8'));
libxml_clear_errors();
$imgs = $doc->getElementsByTagName('img');
foreach ($imgs as $img)
{
if($img->getAttribute('src') == 'pic.jpg')
{
// I want delete that picture form string
$img->parentNode->removeChild($img);
}
else
$img->setAttribute('class', 'image normall');
}
$string = $doc->saveHTML();
echo $string;
In the end of function when I print $string, the target pic has been delete but for other pic, no add any class to them!
but If I remove $img->parentNode->removeChild($img); , the class will add!
what's my wrong?
EDIT
please check for this sample string:
$string = ' <img src="pic.jpg"> and <img src="pic2.jpg">';

Answer 1

You can delete nodes if you iterate backwards.
Simply change
// Forward iteration
foreach ($imgs as $img) {
to
// Reverse iteration
for($i = $imgs->length; --$i >= 0;) {
$img = $imgs->item($i);
Ref: http://php.net/manual/en/class.domnodelist.php#83390

Answer 2

Finaly I solved this with this change....hope help others...
$string = ' <img src="pic.jpg"> and <img src="pic2.jpg">';
$doc = new DOMDocument('1.0', 'UTF-8');
libxml_use_internal_errors(true);
$doc->loadHTML(mb_convert_encoding($string, 'HTML-ENTITIES', 'UTF-8'));
libxml_clear_errors();
$imgs = $doc->getElementsByTagName('img');
$imgs1 = $imgs2 = array();
foreach($imgs as $img) {
if($img->getAttribute('src') == 'pic.jpg')
{
$imgs1[] = $img;
}
else
$imgs2[] = $img;
}
foreach($imgs1 as $img) {
$img->parentNode->removeChild($img);
}
foreach ($imgs2 as $img)
{
$img->setAttribute('class', 'image normall');
}
$string = $doc->saveHTML();
echo $string;