Online PHP editor | output for 42tX2

@ 2020-03-08T07:41:40Z

<?php
$array = [
  '1' => true,
  ['2' => false, '4' => true],
  '3' => true
];


function findKeysWithTrueValues(array $array): array
{
  $matches = [];
  foreach ($array as $key => $value) {
    if (is_array($value)) {
      foreach (findKeysWithTrueValues($value) as $match) {
        $matches[] = $match;
      }
    } elseif ($value === true) {
      $matches[] = $key;
    }
  }
  return $matches;
}

print_r(findKeysWithTrueValues($array));

Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 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 - 8.5.1: Array ( [0] => 1 [1] => 4 [2] => 3 )
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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