<?php
/*
 * YOURLS
 * Compatibility functions when either missing from older PHP versions or not included by default
 */

/**
 * json_encode for PHP, should someone run a distro without php-json -- see http://askubuntu.com/questions/361424/
 *
 */
if( !function_exists( 'json_encode' ) ) {
	function json_encode( $array ) {
		return yourls_array_to_json( $array );
	}
}

/**
 * Converts an associative array of arbitrary depth and dimension into JSON representation. Used for compatibility with older PHP builds.
 *
 * @param array $array the array to convert.
 * @return mixed The resulting JSON string, or false if the argument was not an array.
 * @author Andy Rusterholz
 * @link http://php.net/json_encode (see comments)
 */
function yourls_array_to_json( $array ){

	if( !is_array( $array ) ){
		return false;
	}

	$associative = count( array_diff( array_keys($array), array_keys( array_keys( $array )) ));
	if( $associative ){

		$construct = array();
		foreach( $array as $key => $value ){

			// We first copy each key/value pair into a staging array,
			// formatting each key and value properly as we go.

			// Format the key:
			if( is_numeric( $key ) ){
				$key = "key_$key";
			}
			$key = '"'.addslashes( $key ).'"';

			// Format the value:
			if( is_array( $value )){
				$value = yourls_array_to_json( $value );
			} else if( !is_numeric( $value ) || is_string( $value ) ){
				$value = '"'.addslashes( $value ).'"';
			}

			// Add to staging array:
			$construct[] = "$key: $value";
		}

		// Then we collapse the staging array into the JSON form:
		$result = "{ " . implode( ", ", $construct ) . " }";

	} else { // If the array is a vector (not associative):

		$construct = array();
		foreach( $array as $value ){

			// Format the value:
			if( is_array( $value )){
				$value = yourls_array_to_json( $value );
			} else if( !is_numeric( $value ) || is_string( $value ) ){
				$value = '"'.addslashes($value).'"';
			}

			// Add to staging array:
			$construct[] = $value;
		}

		// Then we collapse the staging array into the JSON form:
		$result = "[ " . implode( ", ", $construct ) . " ]";
	}

	return $result;
}


/**
 * BC Math functions (assuming if one doesn't exist, none does)
 *
 */
if ( !function_exists( 'bcdiv' ) ) {
	function bcdiv( $dividend, $divisor ) {
		$quotient = floor( $dividend/$divisor );
		return $quotient;
	}
	function bcmod( $dividend, $modulo ) {
		$remainder = $dividend%$modulo;
		return $remainder;
	}
	function bcmul( $left, $right ) {
		return $left * $right;
	}
	function bcadd( $left, $right ) {
		return $left + $right;
	}
	function bcpow( $base, $power ) {
		return pow( $base, $power );
	}
}


/**
 * http_build_url compatibility function
 *
 * @since 1.7
 */
if ( !function_exists( 'http_build_url' ) ) {
    include YOURLS_INC . '/http_build_url/http_build_url.php';
}