Generator
PHP Manual

Generator::key

Get the yielded key

Description

public mixed Generator::key ( void )

Gets the key of the yielded value.

Parameters

This function has no parameters.

Return Values

Returns the yielded key.

Examples

Example #1 Generator::key example

<?php

function Gen()
{
    yield 'key' => 'value';
}

$gen = Gen();

echo "{$gen->key()} => {$gen->current()}";

The above example will output:

key => value