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PHP array_flatten() function. Convert a multi-dimensional array into a single-dimensional array.
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<?php | |
/** | |
* Convert a multi-dimensional array into a single-dimensional array. | |
* @author Sean Cannon, LitmusBox.com | seanc@litmusbox.com | |
* @param array $array The multi-dimensional array. | |
* @return array | |
*/ | |
function array_flatten($array) { | |
if (!is_array($array)) { | |
return false; | |
} | |
$result = array(); | |
foreach ($array as $key => $value) { | |
if (is_array($value)) { | |
$result = array_merge($result, array_flatten($value)); | |
} else { | |
$result = array_merge($result, array($key => $value)); | |
} | |
} | |
return $result; | |
} |
For a simple 2D array:
$multiDimArray = [[1, 2], [3, 4], [5, 6]];
$flatArray = array_reduce($multiDimArray, 'array_merge', []);
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@graceman9 Oh you want the keys to be concatenated, so every key keeps the log of its original path. Yeah, you are correct that my version does not do that. I tried to follow the approach common in other languages. 🙂