This script : 

<?
	print "before : ";
	for ($i=1;$i<=6;$i++) {
		$toto[$i] = $i;
	}
	print_r($toto);
	print "<br>\n";
	array_shift($toto);
	print "next : ";
	print_r($toto);
	print "<br>\n";	
?>

give this :

before : Array ( [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 ) 
next : Array ( [0] => 2 [1] => 3 [2] => 4 [3] => 5 [4] => 6 ) 

normally i should have :

before : Array ( [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 ) 
next : Array ( [1] => 2 [1] => 3 [2] => 4 [3] => 5 [4] => 6 ) 

Regards,

Philippe BEAU
Email / Philippe--at--beau.nom.Fr