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run code in 150+ php & hhvm versions
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<?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' => 456]]));
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["foo"]=> int(123) ["bar"]=> int(456) } array(2) { ["foo:bar"]=> int(123) ["foo:baz"]=> int(456) }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/nVGLT on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/nVGLT on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/nVGLT on line 5
Process exited with code 255.