<?php function flatten($arr) { $result = []; foreach ($arr as $key => $value) { if (is_array($value)) { foreach (flatten($value) as $subKey => $scalar) { $result[$key . ':' . $subKey] = $scalar; } } else if (is_scalar($value)) { $result[$key] = $value; } } return $result; } var_dump(flatten(['foo' => 123, 'bar' => 456])); var_dump(flatten(['foo' => ['bar' => 123, 'baz' => ['letsgo' => 'deeper']]]));
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