How to use php key function?

php key function is used to return the key name of the element currently pointed to by the internal pointer of the array. Its syntax is key(array). The parameter array is required and refers to the array to be used.

#How to use the php key function?

Definition and usage

key() function returns the key name of the element currently pointed to by the internal pointer of the array.

If an error occurs, the function returns FALSE.

This function is similar to current(), except that the result returned is different. The current() function returns the value of the element, while the key() function returns the key name of the element.

Syntax

key(array)

Parameters

array Required. Specifies the array to use.

Return value: Returns the key name of the array element pointed to by the current internal pointer.

PHP Version: 4

Example

Return the element key name from the current internal pointer position:

<?php
$people = array("Bill", "Steve", "Mark", "David");
echo "键的当前位置是：" . key($people);
?>

Output:

键的当前位置是：0

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