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This checks the name of the PHP file currently executing.
If it is crackme.php , then the program dies before it gets to important code, because you didn't intend for anyone to execute this file on its own.
If it is included in some other PHP file, then the $PHP_SELF variable will be something other than crackme.php , and the program will continue to execute.
<?php
if (eregi("crackme.php", $PHP_SELF)) exit;
// this is for demonstration only
if (eregi("include_secure", $PHP_SELF)) echo "this file shouldn't be called like this";
?>
learn more about some of the PHP functions used in this snippet: continue, current, die, echo, end, ereg, eregi, exec, exit, file, for, include, tan, var
view the GNU general license - view the GNU library license - search on PHPsnippets - see your code like this
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