Initial commit

pi.math.php

@@ -0,0 +1,130 @@
+<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
+
+$plugin_info = array (
+	'pi_name' => 'Math',
+	'pi_version' => '1.1.1',
+	'pi_author' => 'Michael Leigeber',
+	'pi_author_url' => 'http://www.caddis.co',
+	'pi_description' => 'Use Math to execute PHP supported math formulas.',
+	'pi_usage' => Math::usage()
+);
+
+class Math
+{
+	public $return_data = '';
+
+	function __construct()
+	{
+		$this->EE =& get_instance();
+
+		// Get formula
+		$formula = $this->EE->TMPL->fetch_param('formula');
+
+		$error = false;
+		$result = '';
+
+		if ($formula)
+		{
+			// Convert html entities to math characters
+			$formula = html_entity_decode($formula);
+
+			// Replace parameters
+			$params = $this->EE->TMPL->fetch_param('params');
+
+			if ($params)
+			{
+				$params = explode('|', $params);
+				$i = 1;
+
+				foreach($params as $param)
+				{
+					if (!is_numeric($param))
+					{
+						$param = preg_replace('/\D/', '', $param);
+					}
+
+					$formula = str_replace('[' . $i . ']', $param, $formula);
+
+					$i++;
+				}
+			}
+
+			if (!$error)
+			{
+				// Evaluate math
+				@eval("\$result = $formula;");
+
+				// Get settings
+				$round = $this->EE->TMPL->fetch_param('round');
+				$decimals = $this->EE->TMPL->fetch_param('decimals', 0);
+				$decimal_point = $this->EE->TMPL->fetch_param('dec_point', '.');
+				$thousands_seperator = $this->EE->TMPL->fetch_param('thousands_seperator', ',');
+				$absolute = $this->EE->TMPL->fetch_param('absolute');
+
+				// Rounding
+				if ($round == 'up')
+				{
+					$result = ceil($result);
+				}
+				else if ($round == 'down')
+				{
+					$result = floor($result);
+				}
+
+				// Format response
+				if (strpos($result, '.'))
+				{
+					$parts = explode('.', $result);
+
+					$result = number_format((int)$parts[0], 0, $decimal_point, $thousands_seperator);
+
+					if ($decimals > 0) 
+					{
+						$result .= '.' . str_pad($parts[1], $decimals, 0);
+					}
+				}
+				else
+				{
+					$result = number_format((int)$result, $decimals, $decimal_point, $thousands_seperator);
+				}
+
+				// Absolute value
+				if ($absolute)
+				{
+					$result = abs($result);
+				}
+			}
+		}
+
+		$this->return_data = $result;
+	}
+
+	function usage()
+	{
+		ob_start(); 
+?>
+Parameters:
+
+formula = '(5 * 2) / [1]'		// math formula (required) supports the following operators as well as bitwise + - * / % ++ -- < > <= => != <> ==
+params = '{var}|{var2}'		// pipe delimited list of numeric parameters to be replaced into formula, recommended due to use of PHP eval (default: null)
+decimals = '2' 					// sets the number of decimal points (default: "0")
+decimal_point = '.' 				// sets the separator for the decimal point (default: ".")
+thousands_seperator = ','		// sets the thousands separator; (default: ",")
+absolute = 'yes'					// return the absolute number of the result (defaults: "no")
+round = 'up|down'				// whether to round the result up or down (defaults: no rounding)
+numeric_error = 'Error'			// message returned when non-numeric parameters are provided (default: "Invalid input")
+
+Usage:
+
+{exp:math formula="10 - 12" absolute="yes"} outputs 2
+{exp:math formula="((4 * 5) / 2)" decimals="2"} outputs 10.00
+{exp:math formula="([1] + 1) / [2]" params="{total_results}|2" round="down"} outputs 5 where {total_results} is 10
+<?php
+		$buffer = ob_get_contents();
+
+		ob_end_clean(); 
+
+		return $buffer;
+	}
+}
+?>