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<?php
$arr=array('username'=>'John');
$value=each($arr)[1];
$key=each($arr)[0];
echo "$key=$value";
?>
<?php
$foo = array("bob", "fred", "jussi", "jouni", "egon", "marliese");
$bar = each($foo);
print_r($bar);
?>
Array
(
[1] => bob
[value] => bob
[0] => 0
[key] => 0
)
$key = echo ($arr)[0];
$value = echo $arr[$key];
echo "$key = $value";