The key() function fetches a key from an array. It returns the key of the array element pointed by the internal pointer.
Syntax
key(arr)
Parameters
arr − The array to be used.
Return
The key() function returns the key of the array element pointed by the internal pointer.
Example
The following is an example −
<?php
$arr = array("Electronics","Footwear");
echo "Key from the current position = " . key($arr);
?>Output
Key from the current position = 0
Example
Let us see another example −
<?php
$arr = array(
'one' => 'tim',
'two' => 'peter',
'three' => 'david');
while ($val = current($arr)) {
if ($val == 'peter') {
echo key($arr);
}
next($arr);
}
?>Output
two