As of PHP 5.4, the register_globals feature has been removed from php. If you still need the feature, this post is for you.
Month: March 2017
Insecure PHP Constants and Variables
Since the introduction of register_globals feature in PHP, there was a lot of discussion around the web criticizing this feature as a security risk. There established a perception that all websites on servers having register_globals enabled are insecure and vulnerable to hacking/injection. Consequently, the feature went to Off in PHP 4.2, deprecated in PHP 5.3 and completely removed in PHP 5.4. Even before all this, many web hosts disabled this feature. This caused problems to those not-by-profession PHP coders who rely on ease of use of PHP language to code their business or personal website.
Fixed Length & Large Random Numbers with PHP
PHP’s random number functions generate integers with variable number of digits. Also, the maximum size of the random number generated that way is PHP_INT_MAX. You can remove these two limitations using the function below.
Faster Random Numbers with PHP
Random numbers functions rand() and mt_rand are easy to use and pretty fast. Numbers produced by these functions range from 0 to PHP_INT_MAX unless you specify your own range. In case you use a custom range, it generates a random number within that range, but – it gets slower.
Your own trim, rtrim and ltrim functions in PHP
While we already have trim(), ltrim() and rtrim() in php, here is how we can implement the same feature. These are listed here just for understanding the process. In practice, you are recommended to use the built-in functions for performance and consistency reasons.
How to validate ASCII Text – PHP
ASCII is one of the earliest character encoding scheme providing a way of encoding control characters, commonly used symbols, alphabets and digits. Many modern character encoding schemes extend the character set used by ASCII by providing additional characters so as to not only maintain backward compatibility but also achieve the benefits of encoding more international characters.
Number-to-Word Conversion with PHP
Often it is required to convert a number or integer to English Words for printing on invoices or for displaying final bill on checkout pages of online shopping carts.
Remove undesired characters with trim_all() – PHP
This function was inspired from PHP’s built-in function trim() that removes undesired characters from the start and end of a string, and in case no such characters are provided as second argument to the function, it removes white-space characters from both ends of the string.
Implementing QuickSort in PHP
Quicksort is practically the fastest way to sort an array of data. PHP’s array sorting function sort() uses QuickSort.
Replace last occurrence of a String – PHP
Replacing part of a string with another string is straight forward, but what if you have to replace last occurrence of a character or string with another string.