How to yield value with the key? - php

Question

How to set the key for yielded value? Can the generator have the key as well as array does?
I can easily name keys when returning arrays. It's very useful for PhpUnit dataProviders:
$array = [
'key' => ['value',1,2,3],
'here' => ['a',4,5,6],
'there' => ['b',7,8,9],
];
foreach( $array as $key => $value ){
echo $key."\t=>\t".var_export($value, true)."\n\n\n";
}
but can I do the same using generators?
e.g., how to change the following code?:
function hi()
{
yield ['value',1,2,3];
yield ['a',4,5,6];
yield ['b',7,8,9];
}
$array = hi();
foreach( $array as $key => $value ){
echo $key."\t=>\t".var_export($value, true)."\n\n\n";
}
Currently, the output is:
0 => array (
0 => 'value',
1 => 1,
2 => 2,
3 => 3,
)
1 => array (
0 => 'a',
1 => 4,
2 => 5,
3 => 6,
)
2 => array (
0 => 'b',
1 => 7,
2 => 8,
3 => 9,
)
How can I set the mindful keys for yielded values?

Answer 1

It is easy, yield has documented ability to use keys:
https://www.php.net/manual/en/language.generators.syntax.php
function hi()
{
yield 'key' => ['value',1,2,3];
yield 'here' => ['a',4,5,6];
yield 'there' => ['b',7,8,9];
}
$array = hi();
foreach( $array as $key => $value ){
echo $key."\t=>\t".var_export($value, true)."\n\n\n";
}
The output will have keys, as well as an array does:
key => [
0 => 'value',
1 => 1,
2 => 2,
3 => 3,
]
here => [
0 => 'a',
1 => 4,
2 => 5,
3 => 6,
]
there => [
0 => 'b',
1 => 7,
2 => 8,
3 => 9,
]