这应该可以满足您的需求，我已经在服务器上对其进行了测试，它似乎可以满足您的需求.

This should work with what you are looking for, I tested it on my server and it seems to fit what you are looking for.

$lines_array = file("file.txt");
$search_string = "bing";

foreach($lines_array as $line) {
    if(strpos($line, $search_string) !== false) {
        list(, $new_str) = explode(":", $line);
        // If you don't want the space before the word bong, uncomment the following line.
        //$new_str = trim($new_str);
    }
}

echo $new_str;

?>