Created
October 17, 2017 10:16
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Traverse a nested PHP array/object structure using a path
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| <?php | |
| function array_path($array, $path, $default_value = null) | |
| { | |
| // Construct the path | |
| if (!preg_match('/^(?P<head>\w+)(?P<rest>(\[\w+\]|->\w+)*)$/', $path, $match)) | |
| throw new InvalidArgumentException("The path '$path' is malformed"); | |
| $steps = [['index' => $match['head']]]; | |
| if (!empty($match['rest'])) { | |
| if (!preg_match_all('/\[(?P<index>\w+)\]|->(?P<property>\w+)/', $match['rest'], $match, PREG_SET_ORDER)) | |
| throw new InvalidArgumentException('The rest of the path is malformed'); | |
| $steps = array_merge($steps, $match); | |
| } | |
| // Unwind the path | |
| foreach ($steps as $step) { | |
| if (isset($step['property'])) { | |
| if (!isset($array->{$step['property']})) | |
| return $default_value; | |
| else | |
| $array = $array->{$step['property']}; | |
| } else { | |
| if (!isset($array[$step['index']])) | |
| return $default_value; | |
| else | |
| $array = $array[$step['index']]; | |
| } | |
| } | |
| return $array; | |
| } |
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