Question

我有一个既有文字也有图片的字符串，但我想只使用php删除第一张图片。

$string = 'This is my test <img src="link_to_image1">, some other text.
<img src="link_to_another_image" border="0">';
$str = preg_replace('/\<img src=\"[aA-zZ0-9\/\_\.]+\"\>/','',$string, 1);

Answer 1

$feed_desc = preg_replace('/(<)([img])(\w+)([^>]*>)/', '', $str,1);

Answer 2

使用回调来做到这一点。如果你想根据字符串中不同位置的图像做以后的事情，可能会对你更灵活一点

class imgReplacer {

    function cb($matches){

        if (!$this->counter){

            $this->counter++;
            return '';

        } else {

            return $matches[0];

        }

    }

}


$ir = new imgReplacer;
$ir->counter = 0;

$string = 'This is my test <img src="link_to_image1">, some other text. <img src="link_to_another_image" border="0">';

$string = preg_replace_callback(
    '#(<img.*?>)#',
    array(&$ir, 'cb'),
    $string);

echo $string;

This is my test , some other text. <img src="link_to_another_image" border="0">

提取第一个图像并从字符串中删除第一个图像

2 个答案: