The ArrayIterator::key() function is an inbuilt function in PHP which returns the current key of the array element.
Syntax:
mixed ArrayIterator::key( void )
Parameters: This function does not accept any parameters.
Return Value: This function returns the current array key.
Below programs illustrate the ArrayIterator::key() function in PHP:
Program 1:
<?php // Declare an ArrayIterator $arrItr = new ArrayIterator( array('G', 'e', 'e', 'k', 's', 'f', 'o', 'r') ); // Loop to display the array iterator key foreach($arrItr as $element) { echo $arrItr->key() . "\n"; } ?> |
Output:
0 1 2 3 4 5 6 7
Program 2:
<?php // Declare an ArrayIterator $arrItr = new ArrayIterator( array( "a" => "Geeks", "b" => "for", "c" => "Geeks" ) ); // Append the element into array iterator $arrItr->append("Computer"); $arrItr->append("Science"); $arrItr->append("Portal"); // Display the key and its value of // array iterator foreach($arrItr as $element) { echo "key: " . $arrItr->key() . " Value: " . $arrItr->current() . "\n"; } ?> |
Output:
key: a Value: Geeks key: b Value: for key: c Value: Geeks key: 0 Value: Computer key: 1 Value: Science key: 2 Value: Portal
Reference: https://www.php.net/manual/en/arrayiterator.key.php
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