PHP | AppendIterator key() Function
The AppendIterator::key() function is an inbuilt function in PHP which is used to return the current key.
Syntax:
scalar AppendIterator::key( void )
Parameters: This function does not accept any parameters.
Return Value: This function returns the current key if it is valid or NULL otherwise.
Below programs illustrate the AppendIterator::key() function in PHP:
Program 1:
<?php // Declare an ArrayIterator $arr1 = new ArrayIterator( array ( 'G' , 'e' , 'e' , 'k' , 's' )); // Create a new AppendIterator $itr = new AppendIterator; // Append the ArrayIterator element $itr ->append( $arr1 ); // Display the result while ( $itr ->valid()) { echo "ArrayIterator Key: " . $itr ->key() . " ArrayIterator Value: " . $itr ->current() . "\n" ; $itr ->next(); } ?> |
Output:
ArrayIterator Key: 0 ArrayIterator Value: G ArrayIterator Key: 1 ArrayIterator Value: e ArrayIterator Key: 2 ArrayIterator Value: e ArrayIterator Key: 3 ArrayIterator Value: k ArrayIterator Key: 4 ArrayIterator Value: s
Program 2:
<?php // Declare an ArrayIterator $arr1 = new ArrayIterator( array ( "a" => "Beginner" , "b" => "for" , "c" => "Beginner" ) ); $arr2 = new ArrayIterator( array ( "x" => "Computer" , "y" => "Science" , "z" => "Portal" ) ); // Create a new AppendIterator $itr = new AppendIterator; $itr ->append( $arr1 ); $itr ->append( $arr2 ); $itr -> rewind (); // Display the result while ( $itr ->valid()) { echo "ArrayIterator Key: " . $itr ->key() . " ArrayIterator Value: " . $itr ->current() . "\n" ; $itr ->next(); } ?> |
Output:
ArrayIterator Key: a ArrayIterator Value: Beginner ArrayIterator Key: b ArrayIterator Value: for ArrayIterator Key: c ArrayIterator Value: Beginner ArrayIterator Key: x ArrayIterator Value: Computer ArrayIterator Key: y ArrayIterator Value: Science ArrayIterator Key: z ArrayIterator Value: Portal
Reference: https://www.php.net/manual/en/appenditerator.key.php
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