This is a collection of hints, tips, and code samples that may be useful to people who are thinking of developing in PHP.
The usual disclaimers apply to all code samples (including the MACROs').
| Blocking Unwanted IP Addresses | |
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<?php
$blacklist = array("123.123.", "234.234.234.234", "111.111.222"); if(in_array($_SERVER['REMOTE_ADDR'],$blacklist)) { // this handles exact matches echo '<meta http-equiv="refresh" content="0; URL=http://localhost">' ; exit(); } else { // this handles wild card matches foreach($blacklist as $ip) { if(eregi($ip,$_SERVER['REMOTE_ADDR'])) { echo '<meta http-equiv="refresh" content="0; URL=http://localhost">' ; exit(); } } } ?> |
This code should be placed at the top of a php webpage and it
will stop the IP addresses that are defined from accessing the webpage.
In this example we would block all ip addresses that start 123.123, the specific IP address 234.234.234.234 and all the addresses that start 111.111.222. In the spirit of being nice, if these addresses try and access the webpage they will be sent back to their own localhost (home address 127.0.0.1). You could direct them to any webpage (your own or someone else's) This code could easily be adapted to only allow certain IP address to access your website if needed. |
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| Blocking Unwanted IP Addresses II | |
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<?php $fd = fopen ("BlockIP.txt", "r"); while (!feof ($fd)) { $buffer = fgets($fd, 4096); $lines[] = rtrim($buffer); if(preg_match("/".$buffer."/i",$_SERVER['REMOTE_ADDR'])) { echo '<meta http-equiv="refresh" content="0; URL=http://localhost">' ; exit(); } fclose ($fd); //Cycle through all the IP Addresses in the file foreach($lines as $Spam) { if(in_array($_SERVER['REMOTE_ADDR'],$lines)) { // this is for exact matches echo '<meta http-equiv="refresh" content="0; URL=http://localhost">' ; exit(); } } } ?> |
This version of the code performs exactly the same function as the code above
but the bad guys IP addresses are in an external file.
The file for IP addresses should be located in the same directory as that of the code executing the code. The file is a plain text file. A sample text file of IP Addresses can be found here. Change the file name (highlighted in red in the code sample) to match the name of your own file. |
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| Adding a Last Modified Date to a Webpage | |
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<?php echo '<p align="right">'; $file = __FILE__; $last_modified = filemtime($file); $lmdate = date("l, jS F, Y ", $last_modified); $lm = date('l jS \of F Y ', $last_modified); echo 'Last modified : ' . $lm . ' '; echo '</P>'; ?> |
This code will place the last modified date of a webpage on that webpage.
This this case it is placed on the right side of the screen. Note: The code must be on the target page and can not be included from another file otherwise the last modified date will be of the included file. |
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| Automatic Year Increase for Copyright | |
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Copyright © Abbydale Systems LLC 2015- <?php echo date("Y"); ?> |
This simple piece of code will automatically increase the year on a copyright statement. |
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It is the responsibility of any user of this material to evaluate its usefulness to the user's environment.
Abbydale Systems LLC. does not guarantee to keep this or any related material current, nor does it guarantee to provide any corrections or extensions described by any users of this material or any corrections or extensions made in the future by Abbydale Systems LLC. itself.
