Stiati ca? Nu poti defini constante array in PHP!

December 12th, 2008

Ciudat, interesant totusi ca in PHP se folosesc foarte des array-urile.

Oricum ideea e ca nu poti defini constante in PHP, adica asa:

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// it will not work like this
define('MY_ARRAY', array ('one', 'two', 'three'));
echo MY_ARRAY[0]; // undefined index 0

Dar sunt vreo doua variante prin care poti face asta. Una ar fi sa salvezi de exemplu un string in constanta:

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define ('MY_ARRAY', 'one,two,three');
$my_local_array = explode(',',MY_ARRAY);
echo $my_local_array[0]; // it will work
// result: one

sau poti sa serializezi obiectul (cea mai recomandata), astfel poti sa salvezi array-uri sau orice alte obiecte complexe:

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// va recomand aceasta varianta, e cea mai simpla si are cea mai larga aplicabilitate
 
$arr = array ("one" => 1, "two" => 2, "three" => 3); // variabila de definit
 
define ('MY_ARRAY',serialize($arr)); // salvam obiectul serializat
$my_local_array = unserialize(MY_ARRAY); // il deserializam pentru a-l putea folosi
 
echo $my_local_array['one']; // and there you go :)
// result: 1

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PHP header() and then die()

December 9th, 2008

Usualy, header() function can be used to change page headers, linke header(“Content-type: jpg’);

But, a most use case is, for example when you want to check user login:

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<?php
 
if (!$user->isLogged()) {
 
header("Location: login.php");
 
}
 
?>

The problem is, there are some cases when the script continues to run after header(“Location: “), and you should allways die() after the header(“Location: “).
Like this:

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<?php
 
if (!$user->isLogged()) {
 
header("Location: login.php");
die();
}
 
?>

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Posted in Web development | No Comments »