PHP extracts the image addresses in the database content and outputs them cyclically.

PHP uses regular expressions to extract the output code of the image address loop in the database content. The code is as follows:
/*
1 (? S) indicates Pattern. DOTALL, that is, match the line feed, allowing the img to appear in multiple lines
2 .*? Indicates that non-greedy matches any character until the following conditions appear.
3? : Indicates that the match is not captured, that is, [\. gif | \. jpg] does not appear in the result.
*/
$ Pattern = "//";
$ Str ='

';
Preg_match_all ($ pattern, $ str, $ match );
Print_r ($ match );
/*
Array
(
[0] => Array
(
[0] =>
[1] =>
[2] =>
)
[1] => Array
(
[0] => upfiles/2009/07/1246430143_4.jpg
[1] => upfiles/2009/07/1246430143_3.jpg
[2] => upfiles/2009/07/1246430143_1.jpg
)
)
*/