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by Jeroen
58:51
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engine/classes/Elgg/Json/EmptyKeyEncoding.php (1 issue)

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<?php
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namespace Elgg\Json;
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/**
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 * Encode and decode JSON while converting empty string keys to a unique token.
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 *
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 * This gets around PHP's limitation of not allowing empty string object property names.
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 * https://bugs.php.net/bug.php?id=46600
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 *
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 * @package    Elgg.Core
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 * @subpackage Json
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 * @access     private
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 */
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class EmptyKeyEncoding {
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	/**
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	 * @var string
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	 */
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	protected $token;
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	/**
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	 * Constructor
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	 *
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	 * @param string $empty_key Optional key to replace "" keys with in JSON decode
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	 */
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	public function __construct($empty_key = '') {
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		if (!$empty_key) {
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			$empty_key = sha1(microtime(true) . mt_rand());
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		}
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		$this->token = $empty_key;
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	}
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	/**
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	 * Get the key that represents an empty string key in JSON
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	 *
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	 * @return string
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	 */
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	public function getEmptyKey() {
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		return $this->token;
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	}
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	/**
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	 * Decode JSON while converting empty keys to a unique token.
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	 *
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	 * @param string $json    JSON string
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	 * @param bool   $assoc   Convert objects to assoc arrays?
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	 * @param int    $depth   Allowed recursion depth
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	 * @param int    $options Bitmask json_decode options
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	 *
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	 * @return mixed
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	 * @see json_decode
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	 */
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	public function decode($json, $assoc = false, $depth = 512, $options = 0) {
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		// Replace empty keys with the unique token
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		$json = preg_replace('~([^"\\\\])""\\s*\\:~', "$1\"{$this->token}\":", $json, -1, $count);
1 ignored issue
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		return json_decode($json, $assoc, $depth, $options);
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	}
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	/**
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	 * Encode JSON while converting unique token keys to empty strings
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	 *
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	 * @param mixed $value   Value to encode
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	 * @param int   $options Encoding options
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	 * @param int   $depth   Allowed recursion depth. Do not set this before PHP 5.5
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	 *
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	 * @return string|false
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	 */
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	public function encode($value, $options = 0, $depth = 512) {
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		if ($depth == 512) {
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			// PHP 5.4 and earlier will choke if depth is passed in
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			$json = json_encode($value, $options);
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		} else {
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			$json = json_encode($value, $options, $depth);
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		}
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		// Replace unique tokens with empty strings
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		if (is_string($json)) {
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			$json = str_replace("\"{$this->token}\"", '""', $json);
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		}
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		return $json;
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	}
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}
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