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Cookies in PHP explained. Easy to use function


Submitted on: 6/27/2001 8:00:15 PM
By: Peter Sienkiewicz  
Level: Beginner
User Rating: By 8 Users
Compatibility:PHP 3.0, PHP 4.0

Users have accessed this article 8849 times.
(About the author)
     Cookies in PHP can sometimes be a huge pain in the butt. This function is simple, and teaches you how cookies work, how to write them, expire them, and check their values. Use this cookie for whatever you want, but feedback is always appreciated :o)

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setcookie() is the main function that is used to work with cookiesin PHP

parameters are as follows:

setcookie (string name , string value , int expire , string path , string domain , int secure)

Cookies are sent to the user's computer thru the header: in static files, because this is the case you must set, expire your cookies before displaying anything thru your script.. before any echo() and/or print() functions. This is not a PHP setback, it the way HTML works :o) Check out this simple function i have written. . .

function cookie($function, $value) {

if ($function == "set") {

setcookie ("CookieValue", "$value", time() + 14400);// Cookie is Valid for 4 hours. 3 value in function is the time expiration in seconds. ... 3600 seconds = 1 hour

return true;// cookie set, return true

} else if ($function = "logout") {

setcookie ("CookieValue", "$value", time() - 14400);// Cookie is now expired as we set the expiration value to 4 hours ago
return true; // logout complete

} else if ($function = "check") {

if (isset($CookieValue)) {
if ($CookieValue == $value) {
print("ALL GOOD.. cookie verified");
return true;
} else {
print("Value does not much cookie");
return false; // Failed, so return false

} else {

return false;// Failed, since no operations match




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Other User Comments
10/2/2001 9:12:57 AM:frikk
hey thanks alot... this example if very VERY helpful.
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10/19/2001 9:15:31 PM:rag
the best php cookie tutorial I've seen yet
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10/19/2001 11:33:34 PM:rag
hey, your tutorial helped me with my site with cookies. But I have one question to ask. I have a form that checks whether or not the name/password was valid through a mysql database query. Now, if I were to use your function, how would I call it and set values from the form, onto the value parameter? What I mean is that if the form is already outputted, how am I supposed to validate and set a cookie (since the cookie is in the header and once a document is outputted, it doesn't work). The process is: Fill out the name/password Validate the name/password If true, set cookie, if false, don't set (or expire it). is it possible to do it all in 1 php page? Thanks a lot
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