PHP

PHP ...

Strings

Determine how far two strings are identical

Problem: We have two strings and want know, up to which position they are identical.

A cool solution is found on Stackoverflow in tread "Find first character that is different between two strings", in the posting by ircmaxell on 2011-September-19. He says: "... when you xor two strings, the characters that are the same will become null bytes (chr(0)) ...". (# 20110923.0722). BTW ircmaxell writes nice PHP articles in his blog blog.ircmaxell.com (# 20110923.0722).

In esp/esp.index.php in function # 20110923.0721 it looks like this:

   $s1 = $_SERVER['HTTP_REFERER']; // "http://localhost/eps/testpage.html";
   $s2 = $_SERVER['SCRIPT_URI']    // "http://localhost/eps/eps/index.php";
   $sXor = $s1 ^ $s2;
   $iPos = strspn($sXor, chr(0));
   $sTail1 = substr($s1, $iPos);   // = "testpage.html"
   $sTail2 = substr($s2, $iPos);   // = "eps/index.php"

Send HTTP request

Stackoverflow thread How to send a GET request from PHP? is enumerating some methods to do the job (# 20111212.2121).

Thread

dns_nslookup.php (# 20110525.1211)
html_upload.php (# 20110525.1212)
uploader.php (# 20110525.1213)
uploadersetup.inc.php (# 20110525.1214)