an array can be created by the array() language construct
bar
1

Une value peut etre de nimporte quel type PHP
5
9
42

Differentes sortes de declarations
$arr3 = array ( 5 => 40, 6 => 18, 7 => "b", 8 => "zut") est le meme tableau que le suivant
$arr4 = array ( 5 => 40, 18, "b", 8 => "zut")

$arr3 :
40
18
b
zut

$arr4 :
40
18
b
zut

Create a simple array.
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )
Now delete every item, but leave the array itself intact:
Array ( )
Append an item (note that the new key is 5, instead of 0 as you might expect).
Array ( [5] => 6 )
Re-index:
Array ( [0] => 6 [1] => 7 )

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Checking 0:
Bad:
Good: 1
Bad:
Good: 1

Checking 1:
Bad:
Good: 2
Bad:
Good: 2