vn-asterisk/agi.php

<?php

class Agi {
	private static $initialized = false;
	private static $agivars = [];

	/**
	 * Initializes the AGI class, must be called once when the
	 * application starts.
	 */
	static function init() {
		if (self::$initialized)
			return;

		self::$initialized = true;	
		pcntl_signal(SIGHUP, SIG_IGN);
		pcntl_signal(SIGTERM, SIG_IGN);

		while (!feof(STDIN)) {
			$agivar = trim(fgets(STDIN, 4096));

			if ($agivar === '')
				break;

			$agivar = explode(':', $agivar);

			if (count($agivar) == 2)
				self::$agivars[$agivar[0]] = trim($agivar[1]);	
		}
	}
	
	/**
	 * Returns the value for an AGI variable.
	 * 
	 * @param string $agivar The variable name
	 * @return string The variable value
	 */
	static function get($agivar) {
		if (self::$initialized && isset(self::$agivars[$agivar]))
			return self::$agivars[$agivar];
		else
			return null;
	}

	/**
	 * Sends a command to the 
	 * 
	 * @param string $cmd The command
	 * @param string $result The result string
	 * @return int The command status
	 */
	static function exec($cmd, &$result = null) {
		if (!self::$initialized)
			return -1;
	
		fwrite(STDOUT, "$cmd\n");
		fflush(STDOUT);

		$res = trim(fgets(STDIN, 4096));

		if (preg_match("/^([0-9]{1,3})(.*)/", $res, $matches)) {
			if (preg_match('/^result=([0-9\-]*)( ?\((.*)\))?$/', $matches[2], $match)) {		
				$ret = (int) $match[1];
				if ($num > 0)
					$result = $match[3];
					return $ret;
			}
		}

		return -1;
	}
}