php hard

arrays.php

$a = [
    'numericKey',
    'myKey' => 'valueByStringKey',
];

echo 'About: array array_keys(array $array)' . PHP_EOL;
echo 'Возвращает все ключи массива: ';
echo 'Имеем: ' . var_export($a, true);
echo 'Получаем: ' . var_export(array_keys($a), true);

echo 'About - array_change_key_case' . PHP_EOL;

echo 'About - array_chunk' . PHP_EOL;

echo 'About - array_column' . PHP_EOL;

echo 'About - array_combine' . PHP_EOL;

echo 'About - array_count_values' . PHP_EOL;

echo 'About - array_diff_assoc' . PHP_EOL;

echo 'About - array_diff_key' . PHP_EOL;

echo 'About - array_diff_uassoc' . PHP_EOL;

echo 'About - array_diff_ukey' . PHP_EOL;

echo 'About - array_diff' . PHP_EOL;

echo 'About - array_fill_keys' . PHP_EOL;

echo 'About - array_fill' . PHP_EOL;

echo 'About - array_filter' . PHP_EOL;

echo 'About - array_flip' . PHP_EOL;

echo 'About - array_intersect_assoc' . PHP_EOL;

echo 'About - array_intersect_key' . PHP_EOL;

echo 'About - array_intersect_uassoc' . PHP_EOL;

echo 'About - array_intersect_ukey' . PHP_EOL;

echo 'About - array_intersect' . PHP_EOL;

echo 'About - array_key_exists' . PHP_EOL;

echo 'About - array_key_first' . PHP_EOL;

echo 'About - array_key_last' . PHP_EOL;

echo 'About - array_map' . PHP_EOL;

echo 'About - array_merge_recursive' . PHP_EOL;

echo 'About - array_merge' . PHP_EOL;

echo 'About - array_multisort' . PHP_EOL;

echo 'About - array_pad' . PHP_EOL;

echo 'About - array_pop' . PHP_EOL;

echo 'About - array_product' . PHP_EOL;

echo 'About - array_push' . PHP_EOL;

echo 'About - array_rand' . PHP_EOL;

echo 'About - array_reduce' . PHP_EOL;

echo 'About - array_replace_recursive' . PHP_EOL;

echo 'About - array_replace' . PHP_EOL;

echo 'About - array_reverse' . PHP_EOL;

echo 'About - array_search' . PHP_EOL;

echo 'About - array_shift' . PHP_EOL;

echo 'About - array_slice' . PHP_EOL;

echo 'About - array_splice' . PHP_EOL;

echo 'About - array_sum' . PHP_EOL;

echo 'About - array_udiff_assoc' . PHP_EOL;

echo 'About - array_udiff_uassoc' . PHP_EOL;

echo 'About - array_udiff' . PHP_EOL;

echo 'About - array_uintersect_assoc' . PHP_EOL;

echo 'About - array_uintersect_uassoc' . PHP_EOL;

echo 'About - array_uintersect' . PHP_EOL;

echo 'About - array_unique' . PHP_EOL;

echo 'About - array_unshift' . PHP_EOL;

echo 'About - array_values' . PHP_EOL;

echo 'About - array_walk_recursive' . PHP_EOL;

echo 'About - array_walk' . PHP_EOL;

echo 'About - array' . PHP_EOL;

echo 'About - arsort' . PHP_EOL;

echo 'About - asort' . PHP_EOL;

echo 'About - compact' . PHP_EOL;

echo 'About - count' . PHP_EOL;

echo 'About - current' . PHP_EOL;

echo 'About - each' . PHP_EOL;

echo 'About - end' . PHP_EOL;

echo 'About - extract' . PHP_EOL;

echo 'About - in_array' . PHP_EOL;

echo 'About - key_exists' . PHP_EOL;

echo 'About - key' . PHP_EOL;

echo 'About - krsort' . PHP_EOL;

echo 'About - ksort' . PHP_EOL;

echo 'About - list' . PHP_EOL;

echo 'About - natcasesort' . PHP_EOL;

echo 'About - natsort' . PHP_EOL;

echo 'About - next' . PHP_EOL;

echo 'About - pos' . PHP_EOL;

echo 'About - prev' . PHP_EOL;

echo 'About - range' . PHP_EOL;

echo 'About - reset' . PHP_EOL;

echo 'About - rsort' . PHP_EOL;

echo 'About - shuffle' . PHP_EOL;

echo 'About - sizeof' . PHP_EOL;

echo 'About - sort' . PHP_EOL;

echo 'About - uasort' . PHP_EOL;

echo 'About - uksort' . PHP_EOL;

echo 'About - usort' . PHP_EOL;

phpHard.php

== копирование объекта по ссылке ===
https://3v4l.org/6PftC