If the array has non-numerical keys, array_shift extracts
the first element, whichever is the key, and recompute the
numerical keys, if there are any. Ie :
$array = array("c" => "ccc", 0
=> "aaa", "d" =>
"ddd", 5 => "bbb");
$first = array_shift($array);
echo '$first = ' . $first . ', $array = ' .
var_export($array, true);
will display :
$first = ccc, $array = array ( 0 => 'aaa', 'd' =>
'ddd', 1 => 'bbb', )
It means that array_shift works with associative arrays too,
and leaves the keys unchanged if they are non-numerical.
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