Free PHPFree PHP scripts classes and info

Swap array

Swaps all array values to array keys and vice versa.

Since PHP 4 there exists a build in function for this snippet:
array_flip.

Randomize SQL query results

There are many ways to get random database results, here I explain two of them.

Caching for dynamic content

I made this snippet to show how to use the Last-Modified and the ETag header
to optimize the caching of a website. If used correctly this will speed up
your page loads.

Split an array into chunks

This function splits a array into a given size.
This can be useful for creating columns or dividing a
list in multiple parts.

ROT13 transform

Simple example of the ROT13 algorithm. ROT13 is a simple function which rotates the
characters of a string 13 places forward.

Hint:
Since PHP 4+ you can use the PHP build-in function str_rot13.
This is just a example implementation to show how it works.

Delete temporary files

This example shows how to delete specific files
after a given time span.
This works good for cleaning cached files.

MD5-based block cipher

Below is a MD5-based block cipher (MDC-like), which works in 128bit CFB mode.
It is very useful to encrypt secret data before transfer it over the network.

Format string as machine compatible key

This snippet converts a “dirty” string that may contain special characters into a machine compatible nice looking string.

That function works fine for creating urls or ID keys.