Online PHP editor | output for DAIQV

@ 2024-09-24T19:13:12Z

<?php

function chained(iterable ...$input): Generator
{
    foreach ($input as $iterable) {
        yield from $iterable;
    }
}

echo "The \"chained\" elements using a generator: ";
foreach(chained(
    [1,2,3],
    [4,5],
) as $item){
    echo "$item ";
}
echo "\n\n";

echo "However, when it comes to converting the generator to array, there is a caveat:\n";

$numbers = chained(
    [1,2,3],
    [4,5],
);
print_r(
    iterator_to_array($numbers)
);

echo "\n";
echo "The issue is caused by overlapping keys. See how they appear in the sequence:\n";

foreach(chained(
    [1,2,3],
    [4,5],
) as $key => $item){
    echo "[$key] => $item\n";
}
echo "\n\n";

echo "The issue is not present when the keys do not overlap:\n";

$numbers = chained(
    [1,2,3],
    [10 => 4,5],
);
print_r(
    iterator_to_array($numbers)
);

Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: The "chained" elements using a generator: 1 2 3 4 5 However, when it comes to converting the generator to array, there is a caveat: Array ( [0] => 4 [1] => 5 [2] => 3 ) The issue is caused by overlapping keys. See how they appear in the sequence: [0] => 1 [1] => 2 [2] => 3 [0] => 4 [1] => 5 The issue is not present when the keys do not overlap: Array ( [0] => 1 [1] => 2 [2] => 3 [10] => 4 [11] => 5 )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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