PHP method for reading the link function of a website. Principle: read the source files of a website and use regular expressions to analyze the source code to obtain all links? * ********* Qiushuiwuhen (2002-5-20) ************ if (empty (url) urlwww. csdn. principle: read the source files of a website and analyze the source code using regular expressions to obtain all links.
/********** Qiushuiwuhen (2002-5-20 )***********/
If (empty ($ url) $ url = "http://www.csdn.net/expert/"; // Set url
$ Site = substr ($ url, 0, strpos ($ url, "/", 8); // site
$ Base = substr ($ url, 0, strrpos ($ url, "/") + 1); // Directory of the file
$ Fp = fopen ($ url, "r"); // open the url
While (! Feof ($ fp) $ contents. = fread ($ fp, 1024 );//
$ Pattern = "| href = ["]? ([^ "] +) ["] | U ";
Preg_match_all ($ pattern, $ contents, $ regArr, PREG_SET_ORDER); // match all href =
For ($ I = 0; $ I If (! Eregi (": //", $ regArr [$ I] [1]) // whether it is a relative path, that is, whether there are ://
If (substr ($ regArr [$ I] [1],) = "/") // whether it is the root directory of the site
Echo "link". ($ I + 1). ":". $ site. $ regArr [$ I] [1]."
"; // Root directory
Else
Echo "link". ($ I + 1). ":". $ base. $ regArr [$ I] [1]."
"; // Current Directory
Else
Echo "link". ($ I + 1). ":". $ regArr [$ I] [1]."
"; // Relative path
}
Fclose ($ fp );
?>
Why? /********** Qiushuiwuhen (2002-5-20) ***********/if (empty (url )) url = "http://www.csdn ....
