Emoji4Unicode.php

<?php
class Emoji4Unicode {

	protected $_config = array();

	private $__carrierMap = array(
		'docomo' => 'docomo',
		'kddi' => 'kddi',
		'softbank' => 'softbank',
		'google' => 'google',
		'img' => 'img',
	);

	private $__xmlObject = null;

	public function __construct(array $config = array()) {
		$defaults = array(
			'basePath' => dirname(__FILE__) . DIRECTORY_SEPARATOR,
			'dataSource' => 'emoji4unicode.xml',
			'imageDir' => 'img',
		);
		$config += $defaults;
		$dataSource = $config['basePath'] . $config['dataSource'];
		if (!file_exists($dataSource)) {
			throw new ErrorException('DataSource is not exists. "' . $dataSource . '"');
		}
		$this->__xmlObject = simplexml_load_file($dataSource);

		$this->_config = $config;
	}

	/**
	 * Set Carrier Map
	 *
	 * @param array $carrierMap array('kddi' => 'au)
	 * @return array set CarrierMap
	 */
	public function setCarrierMap(array $carrierMap) {
		$carrierMap += $this->__carrierMap;
		return $this->__carrierMap = $carrierMap;
	}

	private function __convertCarrierMap($carrier) {
		$result = array_search($carrier, $this->__carrierMap);
		if ($result === false) {
			throw new ErrorException('Undefined carrier name. "' .  $carrier . '"');
		}
		return $result;
	}

	/**
	 * Convert Emoji Code
	 *
	 * @param string $string
	 * @param string $to Carrier 'docomo', 'kddi', 'softbank', 'google' or 'img'
	 * @param string $from Carrier 'docomo', 'kddi', 'softbank', 'google'
	 * @param array $options Options
	 *			'class' img tag class name
	 *			'width' img tag width
	 *			'height' img tag height
	 *			'textFallback' if it is true, return text
	 *			'defaultText' default value return text
	 *			'binary' if it is true, return binary
	 *			'encoding' it is used when binary encode
	 * @return string
	 */
	public function convert($string, $to, $from, array $options = array()) {
		$to = $this->__convertCarrierMap($to);
		$from = $this->__convertCarrierMap($from);

		$default = array(
			'class' => 'emoji',
			'width' => '20',
			'height' => '20',
			'textFallback' => true,
			'defaultText' => '[emoji]',
			'binary' => false,
			'encoding' => 'UTF-8',
		);
		$options += $default;

		preg_match_all('/&#x([0-9A-F]+);/', $string, $matches);
		$matches[0] = array_unique($matches[0]);
		$matches[1] = array_unique($matches[1]);

		$map = $this->__xmlObject;
		foreach ($matches[1] as $key => $match) {
			$results = $map->xpath('//e[@' . $from . '="' . $match . '"]');
			$result = current($results);

			try {
				if ($to === 'img') {
					$replace = $this->__toImg($result, $match, $from, $options);
				} else {
					$replace = $this->__toEmoji($result, $to, $options);
				}
			} catch (Exception $e) {
				$replace = $this->__toText($result, $options);
			}

			$search = $matches[0][$key];
			$string = str_replace($search, $replace, $string);
		}
		return $string;
	}

	private function __toImg($result, $match, $from, $options) {
		$folder = $from;
		$emoji = $match;
		if (isset($result['img_from']) && $result['img_from'] !== 'google') {
			$folder = $result['img_from'];
			$emoji = $result[$result['img_from']];
		}
		elseif ($from === 'google') {
			$carrier = array_keys($this->__carrierMap);
			foreach ($carrier as $_carrier) {
				if (isset($result[$_carrier])) {
					$folder = $_carrier;
					$emoji = $result[$_carrier];
				}
				break;
			}
		}

		$src = $this->_config['basePath'] . $this->_config['imageDir'] . DIRECTORY_SEPARATOR;
		$src .= $folder . DIRECTORY_SEPARATOR . $emoji . '.gif';
		if (!file_exists($src)) {
			throw new Exception('Emoji not found');
		}
		$base64 = base64_encode(file_get_contents($src));
		$replace = sprintf('<img class="%s" src="data:image/gif;base64,%s" width="%s" height="%s" />', $options['class'], $base64, $options['width'], $options['height']);

		return $replace;
	}

	private function __toEmoji($result, $to, $options) {
		if (!isset($result[$to])) {
			throw new Exception('Emoji not found');
		}

		$result[$to] = str_replace('>', '', $result[$to]);
		if ($options['binary'] === true) {
			$replace = mb_convert_encoding(pack('H*', $result[$to]), $options['encoding'], 'UCS-2');
		} else {
			$replace = '&#x' . $result[$to] . ';';
		}

		return $replace;
	}

	private function __toText($result, $options) {
		if ($options['textFallback'] === false) {
			return '';
		}
		$replace = $options['defaultText'];
		if (isset($result['text_fallback'])) {
			$replace = $result['text_fallback'];
		}
		return $replace;
	}
}
?>