Image class

<?php
/* © Copyright 2011 - tomas.bara@whoami.cz */
/*
    Please.. check my class and if u know better way.. tell me..
*/

    class image {

        /* ***** */

        private $image = false;
        private $imageType = false;
        public $imageTypes = false;

        /* ***** */

        function __construct (  ) {

            $this->imageTypes = array(
                IMAGETYPE_JPEG => array(
                    'extension' => 'jpg',
                    'contentType' => 'image/jpg',
                    'functionLoad' => 'imagecreatefromjpeg',
                    'functionOutput' => 'imagejpeg',
                ),
                IMAGETYPE_GIF => array(
                    'extension' => 'gif',
                    'contentType' => 'image/gif',
                    'functionLoad' => 'imagecreatefromgif',
                    'functionOutput' => 'imagegif',
                ),
                IMAGETYPE_PNG => array(
                    'extension' => 'png',
                    'contentType' => 'image/png',
                    'functionLoad' => 'imagecreatefrompng',
                    'functionOutput' => 'imagepng',
                ),
            );

        }

        /* ***** */

        function isValidImageType ( $imageType = false ) {
            if ( isset($this->imageTypes[($imageType)]) && is_array($this->imageTypes[($imageType)]) ) {
                if ( isset($this->imageTypes[($imageType)]['extension'], $this->imageTypes[($imageType)]['contentType'], $this->imageTypes[($imageType)]['functionLoad'], $this->imageTypes[($imageType)]['functionOutput']) ) {
                    return true;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        function functionLoad ( $imageType = IMAGETYPE_JPEG, $parms = array() ) {
            if ( $this->isValidImageType($imageType) && is_array($parms) ) {
                return call_user_func_array($this->imageTypes[($imageType)]['functionLoad'], $parms);
            } else {
                return false;
            }
        }

        function functionOutput ( $imageType = IMAGETYPE_JPEG, $parms = array() ) {
            if ( $this->isValidImageType($imageType) && is_array($parms) ) {
                return call_user_func_array($this->imageTypes[($imageType)]['functionOutput'], $parms);
            } else {
                return false;
            }
        }

        /* ***** */

        function load ( $file = false ) {
            if ( isset($file) && !empty($file) && is_string($file) ) {
                $imageInfo = getimagesize($file);
                if ( $this->isValidImageType($imageInfo[2]) ) {
                    $image = $this->functionLoad($imageInfo[2], array( $file ));
                    if ( $image !== false ) {
                        $this->imageType = $imageInfo[2];
                        $this->image = $image;
                        return $this;
                    } else {
                        return false;
                    }
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        function loadString ( $string = false, $imageType = IMAGETYPE_JPEG ) {
            if ( isset($string) && !empty($string) && is_string($string) ) {
                if ( $this->isValidImageType($imageType) ) {
                    $image = imagecreatefromstring($string);
                    if ( $image !== false ) {
                        $this->imageType = $imageType;
                        $this->image = $image;
                        return $this;
                    } else {
                        return false;
                    }
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        function loadUri ( $uri = false ) {
            if ( isset($uri) && !empty($uri) && is_string($uri) ) {
                $uriParts = explode(',', $uri);
                $contentType = explode(':', $uriParts[0]);
                $contentType = explode(';', $contentType[1]);
                $contentType = $contentType[0];
                $imageSrc = base64_decode($uriParts[1]);
                foreach ( $this->imageTypes as $key => $val ) {
                    if ( $val['contentType'] == $contentType ) {
                        $imageType = $key;
                        break;
                    }
                }
                if ( isset($imageType) && $this->isValidImageType($imageType) ) {
                    return $this->loadString($imageSrc, $imageType);
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        /* ***** */

        function save ( $file = false, $imageType = IMAGETYPE_JPEG ) {
            if ( isset($file) && !empty($file) && is_string($file) ) {
                if ( $this->isValidImageType($imageType) ) {
                    if ( $this->functionOutput($imageType, array( $this->image, $file )) ) {
                        return $this;
                    } else {
                        return false;
                    }
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        /* ***** */

        function output ( $imageType = IMAGETYPE_JPEG, $header = false ) {
            if ( $this->isValidImageType($imageType) ) {
                if ( $header ) {
                    header("Content-type: ".$this->imageTypes[($imageType)]['contentType']);
                }
                if ( $this->functionOutput($imageType, array( $this->image )) ) {
                    return $this;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        function outputString ( $imageType = IMAGETYPE_JPEG ) {
            if ( $this->isValidImageType($imageType) ) {
                ob_start();
                    if ( $this->output($imageType) !== false ) {
                        $valid = true;
                    } else {
                        $valid = false;
                    }
                    $output = ob_get_contents();
                ob_end_clean();
                if ( $valid ) {
                    return $output;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        function outputUri ( $imageType = IMAGETYPE_JPEG ) {
            if ( $this->isValidImageType($imageType) ) {
                return 'data:'.$this->imageTypes[($imageType)]['contentType'].';base64,'.base64_encode($this->outputString($imageType));
            } else {
                return false;
            }
        }

        /* ***** */

        function getWidth (  ) {
            return imagesx($this->image);
        }

        function getHeight (  ) {
            return imagesy($this->image);
        }

        function getImageType (  ) {
            return $this->imageType;
        }

        /* ***** */

        function resize ( $width, $height ) {
            if ( ( isset($width) && !empty($width) && is_numeric($width) ) && ( isset($height) && !empty($height) && is_numeric($height) ) ) {
                $newImage = imagecreatetruecolor($width, $height);
                imagecopyresampled($newImage, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
                $this->image = $newImage;
                return $this;
            } else {
                return false;
            }
        }

        function resizeToWidth ( $width ) {
            if ( isset($width) && !empty($width) && is_numeric($width) ) {
                $ratio = $width / $this->getWidth();
                $height = $this->getheight() * $ratio;
                $this->resize($width, $height);
                return $this;
            } else {
                return false;
            }
        }

        function resizeToHeight ( $height ) {
            if ( isset($height) && !empty($height) && is_numeric($height) ) {
                $ratio = $height / $this->getHeight();
                $width = $this->getWidth() * $ratio;
                $this->resize($width, $height);
                return $this;
            } else {
                return false;
            }
        }

        function resizeToMin ( $width, $height ) {
            if ( ( isset($width) && !empty($width) && is_numeric($width) ) && ( isset($height) && !empty($height) && is_numeric($height) ) ) {
                $or = $this->getWidth() / $this->getHeight();
                $r = $width / $height;
                if ( $r > $or ) {
                    $this->resizeToWidth($width);
                } else if ( $r < $or ) {
                    $this->resizeToHeight($height);
                } else {
                    $this->resize($width, $height);
                }
                return $this;
            } else {
                return false;
            }
        }

        function resizeToMax ( $width, $height ) {
            if ( ( isset($width) && !empty($width) && is_numeric($width) ) && ( isset($height) && !empty($height) && is_numeric($height) ) ) {
                $or = $this->getWidth() / $this->getHeight();
                $r = $width / $height;
                if ( $r > $or ) {
                    $this->resizeToHeight($height);
                } else if ( $r < $or ) {
                    $this->resizeToWidth($width);
                } else {
                    $this->resize($width, $height);
                }
                return $this;
            } else {
                return false;
            }
        }

        function centerCrop ( $width, $height ) {
            if ( ( isset($width) && !empty($width) && is_numeric($width) ) && ( isset($height) && !empty($height) && is_numeric($height) ) ) {
                $newImage = imagecreatetruecolor($width, $height);
                imagecopy ( $newImage, $this->image, 0, 0, (($this->getWidth()-$width)/2), (($this->getHeight()-$height)/2), $this->getWidth(), $this->getHeight());
                $this->image = $newImage;
                return $this;
            } else {
                return false;
            }
        }

        function scale ( $scale ) {
            if ( isset($scale) && !empty($scale) && is_numeric($scale) ) {
                $width = $this->getWidth() * $scale/100;
                $height = $this->getheight() * $scale/100;
                $this->resize($width, $height);
                return $this;
            } else {
                return false;
            }
        }

        function justifyResizeCenterCrop ( $width, $height ) {
            if ( ( isset($width) && !empty($width) && is_numeric($width) ) && ( isset($height) && !empty($height) && is_numeric($height) ) ) {
                $this->resizeToMin($width, $height)->centerCrop($width, $height);
                return $this;
            } else {
                return false;
            }
        }

        /* ***** */

    }

?>