<?php class Complex { private $realPart = 0; private $imaginaryPart = 0; private $suffix = NULL; public static function _parseComplex($complexNumber) { // Test for real number, with no imaginary part if (is_numeric($complexNumber)) return array( $complexNumber, 0, NULL ); // Fix silly human errors if (strpos($complexNumber,'+-') !== FALSE) $complexNumber = str_replace('+-','-',$complexNumber); if (strpos($complexNumber,'++') !== FALSE) $complexNumber = str_replace('++','+',$complexNumber); if (strpos($complexNumber,'--') !== FALSE) $complexNumber = str_replace('--','-',$complexNumber); // Basic validation of string, to parse out real and imaginary parts, and any suffix $validComplex = preg_match('/^([\-\+]?(\d+\.?\d*|\d*\.?\d+)([Ee][\-\+]?[0-2]?\d{1,3})?)([\-\+]?(\d+\.?\d*|\d*\.?\d+)([Ee][\-\+]?[0-2]?\d{1,3})?)?(([\-\+]?)([ij]?))$/ui',$complexNumber,$complexParts); if (!$validComplex) { // Neither real nor imaginary part, so test to see if we actually have a suffix $validComplex = preg_match('/^([\-\+]?)([ij])$/ui',$complexNumber,$complexParts); if (!$validComplex) { throw new Exception('COMPLEX: Invalid complex number'); } // We have a suffix, so set the real to 0, the imaginary to either 1 or -1 (as defined by the sign) $imaginary = 1; if ($complexParts[1] === '-') { $imaginary = 0 - $imaginary; } return array(0, $imaginary, $complexParts[2]); } // If we don't have an imaginary part, identify whether it should be +1 or -1... if (($complexParts[4] === '') && ($complexParts[9] !== '')) { if ($complexParts[7] !== $complexParts[9]) { $complexParts[4] = 1; if ($complexParts[8] === '-') { $complexParts[4] = -1; } // ... or if we have only the real and no imaginary part (in which case our real should be the imaginary) } else { $complexParts[4] = $complexParts[1]; $complexParts[1] = 0; } } // Return real and imaginary parts and suffix as an array, and set a default suffix if user input lazily return array( $complexParts[1], $complexParts[4], !empty($complexParts[9]) ? $complexParts[9] : 'i' ); } // function _parseComplex() public function __construct($realPart, $imaginaryPart = null, $suffix = 'i') { if ($imaginaryPart === null) { if (is_array($realPart)) { // We have an array of (potentially) real and imaginary parts, and any suffix list ($realPart, $imaginaryPart, $suffix) = array_values($realPart) + array(0.0, 0.0, 'i'); } elseif((is_string($realPart)) || (is_numeric($realPart))) { // We've been given a string to parse to extract the real and imaginary parts, and any suffix list ($realPart, $imaginaryPart, $suffix) = self::_parseComplex($realPart); } } // Set parsed values in our properties $this->realPart = (float) $realPart; $this->imaginaryPart = (float) $imaginaryPart; $this->suffix = strtolower($suffix); } public function getReal() { return $this->realPart; } public function getImaginary() { return $this->imaginaryPart; } public function getSuffix() { return $this->suffix; } public function __toString() { $str = ""; if ($this->imaginaryPart != 0.0) { if (abs($this->imaginaryPart) != 1.0) { $str .= $this->imaginaryPart . $this->suffix; } else { $str .= (($this->imaginaryPart < 0.0) ? '-' : ''). $this->suffix; } } if ($this->realPart != 0.0) { if (($str) && ($this->imaginaryPart > 0.0)) $str = "+" . $str; $str = $this->realPart . $str; } if (!$str) $str = "0.0"; return $str; } }