PHP key() function

The key( ) function returns the element key from the current internal pointer position. This function was introduced in 4.0.

Syntax

Parameter

Parameter	Description	Is compulsory
array	Specifies the array to use.	compulsory

Returns

The key( ) returns the key of the array element that is currently being pointed by the internal pointer.

Example 1

<?php
$subject=array("java","php","ruby","python");
echo "The key from the current position is: " . key($subject);
?>

Output:

The key from the current position is: 0

Example 2

<?php
$subjects = array(Subject1 => "OS", Subject2 => "compiler", Subject3 => "dbms");
echo "Current position Key is : " . key($subjects);
?>

Output:

Current position Key is : Subject1

Example 3

<?php
$car = array(tata => "jaguar", maruti => "baleno", bmw => "x6");
echo "Current position Key is : " . key($car);
?>

Output:

Current position Key is :tata

Example 4

<?php
$city=array("noida","hyderabad","bangalore","mumbai");
echo "The key from the current position is: " . key($city);
?>

Output:

The key from the current position is: 0

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