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<?php |
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/** |
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* @copyright Copyright (c) Flipbox Digital Limited |
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* @license https://github.com/flipbox/skeleton/blob/master/LICENSE |
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* @link https://github.com/flipbox/skeleton |
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*/ |
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namespace Flipbox\Skeleton\Helpers; |
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use JsonSerializable; |
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/** |
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* @author Flipbox Factory <[email protected]> |
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* @since 2.0.0 |
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*/ |
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class JsonHelper |
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{ |
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/** |
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* Encodes an arbitrary variable into JSON format |
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* |
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* @param mixed $var any number, boolean, string, array, or object to be encoded. |
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* If var is a string, it will be converted to UTF-8 format first before being encoded. |
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* @return string JSON string representation of input var |
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*/ |
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public static function encode($var): string |
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{ |
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switch (gettype($var)) { |
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case 'boolean': |
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return $var ? 'true' : 'false'; |
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case 'NULL': |
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return 'null'; |
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case 'integer': |
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return (int)$var; |
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case 'double': |
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case 'float': |
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return str_replace(',', '.', (float)$var); // locale-independent representation |
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case 'string': |
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return json_encode($var); |
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case 'array': |
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/* |
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* As per JSON spec if any array key is not an integer |
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* we must treat the the whole array as an object. We |
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* also try to catch a sparsely populated associative |
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* array with numeric keys here because some JS engines |
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* will create an array with empty indexes up to |
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* max_index which can cause memory issues and because |
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* the keys, which may be relevant, will be remapped |
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* otherwise. |
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* |
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* As per the ECMA and JSON specification an object may |
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* have any string as a property. Unfortunately due to |
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* a hole in the ECMA specification if the key is a |
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* ECMA reserved word or starts with a digit the |
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* parameter is only accessible using ECMAScript's |
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* bracket notation. |
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*/ |
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// treat as a JSON object |
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if (is_array($var) && |
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count($var) && |
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(array_keys($var) !== range(0, sizeof($var) - 1)) |
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) { |
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return '{' . |
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join( |
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',', |
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array_map( |
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[ |
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JsonHelper::class, |
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'nameValue' |
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], |
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array_keys($var), |
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array_values($var) |
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) |
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) . '}'; |
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} |
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// treat it like a regular array |
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return '[' . join(',', array_map(array(JsonHelper::class, 'encode'), $var)) . ']'; |
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case 'object': |
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// Check for the JsonSerializable interface available in PHP5.4 |
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// Note that instanceof returns false in case it doesn't know the interface. |
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if (interface_exists('JsonSerializable', false) && $var instanceof JsonSerializable) { |
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// We use the function defined in the interface instead of json_encode. |
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// This way even for PHP < 5.4 one could define the interface and use it. |
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return self::encode($var->jsonSerialize()); |
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} elseif ($var instanceof \Traversable) { |
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$vars = []; |
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foreach ($var as $k => $v) { |
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$vars[$k] = $v; |
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} |
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} else { |
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$vars = get_object_vars($var); |
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} |
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return '{' . |
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join( |
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',', |
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array_map( |
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[ |
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JsonHelper::class, |
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'nameValue' |
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], |
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array_keys($vars), |
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array_values($vars) |
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) |
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) . '}'; |
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default: |
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return ''; |
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} |
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} |
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/** |
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* array-walking function for use in generating JSON-formatted name-value pairs |
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* |
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* @param string $name name of key to use |
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* @param mixed $value reference to an array element to be encoded |
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* |
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* @return string JSON-formatted name-value pair, like '"name":value' |
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* @access private |
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*/ |
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protected static function nameValue($name, $value) |
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{ |
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return self::encode(strval($name)) . ':' . self::encode($value); |
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} |
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} |
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flipbox /
skeleton
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