(PHP 5 >= 5.5.0, PHP 7)
Get the yielded key
public mixed Generator::key ( void )
Gets the key of the yielded value.
Returns:
Returns the yielded key.
Examples:
Generator::key() example
<?php
function Gen()
{
yield 'key' => 'value';
}
$gen = Gen();
echo "{$gen->key()} => {$gen->current()}";
The above example will output:
key => value
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