I found this function very good to use if your want your urls like index.php?login or index.php?register
Please check my another post:

An even simpler case-insensitive alternative to array_key_exists(): I’m motivated to make a positive impact on your revenue through the customer web portal development project. To take the speed advantage of isset() while keeping the reliable result from array_key_exists(), we combined the both: Usually an element being set NULL is a rare case, so in most of the time, isset() is still reliable. i.e. Here is a little function for case sensitivity to elaborate on what was said by MarkL from ##php (Freenode) and mmanning at mdanderson dot org from this page: // Case sensitive version of array_key_exists() using preg_match() GitHub Gist: instantly share code, notes, and snippets. Yes, it’s more reliable than isset(), but it’s SLOW. Clone via Performance Analysis of isset() vs array_key_exists() At Confoo I had an interesting conversation with Guilherme Blanco regarding the fact that in Doctrine 2 they had a performance issue due to usage of array_key_exists() and how it was significantly slower than isset().

I came across a blog post this morning talking about the performance of isset() vs. array_key_exists(). I just want to note that array_key_exists() can be extremely slow for large (>200 keys) arrays. The takeaway is that isset() is actually faster than array_key_exists() because isset() is actually a language construct, not a function, so it doesn’t incur the function call overhead. Beispiel #2 array_key_exists() vs. isset() isset() gibt nicht TRUE zurück für Schlüssel eines Arrays, die zu einem NULL -Wert gehören, array_key_exists() tut dies hingegen. array_key_exists(), at least in 5.2.4, passes the array by value.

This may be true except for one small hitch. isset() will return false for arrays keys that have there value set to NULL, which is therefore not entirely accurate. You'll notice several notes on this page stating that isset() is significantly faster than array_key_exists(). Further research on this has turned up that the performance problems are a known, confirmed bug in PHP 5.1.x, and have been fixed in PHP builds after September 2006.

Note that isset will return false for NULL values. Here is my script : ┌─(yoda@ev5)(14:25:29) isset() vs array_key_exists() Autore articolo Di grimax; Data dell'articolo 9 Marzo 2012; Nessun commento su isset() vs array_key_exists() Qual’è il modo più performante per determinare se un elemento è contenuto in un array? Copy sharable link for this gist.

Embed Main difference comes into picture while you are dealing with the Here is the difference between these two functions, now be careful while using any of the function mentioned above.I think there should be ‘three’ => null in isset() code part.I think the third array element in the isset() example and the third isset() call has to be “three” not “two”?
//-----------------------------------------------------------------------------//-----------------------------------------------------------------------------//----------------------------------------------------------------------------- Détermine si une variable est considérée définie, ceci signifie qu'elle est déclarée et est différente de NULL.. Si une variable a été détruite avec la fonction unset(), elle n'est plus considéré comme définie. Yes you’re right there are some mistakes on the codes. It will check the existence plus value of that variable also. But the major difference lies in the values they return on certain … While working with large JSON datastructures I encountered an increasing need to check the presence of certain data all over the place. array_key_exists doesn't work with objects implementing ArrayAccess interface. Il seguente test ci schiarirà le idee.
HTTPS (That’s what reminded me to write this blog post, actually.) array_key_exists, isset and empty behaves in a very different way. Instantly share code, notes, and snippets. Embed this gist in your website.

array_key_exists() checks if the given key or index exists in the array (checks in keys, not in values) and returns true, or false otherwise. You'll notice several notes on this page stating that isset() is significantly faster than array_key_exists(). Professional programmers should be aware of this.The right way to check  if an element exists in an array is to use However, array_key_exits() still sucks. The argument of array_key_exists() vs. isset() came up in the workplace today, so I conducted a little benchmark to see which is faster: Just to loop takes time. Visits the manual (links above) for examples and more information. Para checar a existência de uma propriedade em um objeto, utilize a função I conclude this from seeing performance worsen as the array to search got bigger. Star 0 Fork 1 Code Revisions 4 Forks 1. I've got a new take on the multi key function I would like to share. However, the returned result of isset() can be misleading sometimes.So the case that the isset() cause you danger is: the element does exist in the array but it is set NULL. If you time that loop:Thanks for spotting out. $Arr[‘MyElemenet’] =NULL; In this case, isset() always return FALSE.

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