PHP Create thumbnail image

<无详细内容> /** * Upload images to generate thumbnails * * Requires support of GD2 Library * * Initialization requires parameter new thumbnails (' original address of thumbnail image ', ' width of thumbnail ', ' height of thumbnail ', ' (optional parameter) thumbnail save path '); * If the last parameter is not specified, then the thumbnail is saved in the small folder in the same directory as the original image. * If the small folder does not exist, the small folder will be created automatically * * Call method produce to create thumbnails after initialization * $thumbnails = new thumbnails ("...); * $thumbnails->produce (); * * You can get information about the original picture, width, height, and picture mime * * $thumbnails->getimagewidth (); int picture width * $thumbnails->getimageheight (); int picture Height * $thumbnails->getimagemime (); MIME of a string picture * * $thumbnails->truesize (); Array this is a value that contains the width and height values after the thumbnail of the picture, etc. * $size = Array (' width ' = ', ' height ' = '); * Get the width and height of the image after the thumbnail * $size the width of [' width ']//, etc. than the thumbnail image * $size the height of the [' Height ']//, etc. than the thumbnail image * */ Class thumbnails{ Private $IMGSRC; The path to the picture Private $SAVESRC; Save path of picture, default is empty Private $canvasWidth; Width of canvas Private $canvasHeight; The height of the canvas Private $im; Canvas Resources Private $DM; Copy the resources returned by the picture /** * Initialize class, load related settings * * @param $imgSrc The path of the picture that needs to be abbreviated * @param $canvasWidth the width of the thumbnail image * @param $canvasHeight The height of the thumbnail image */ Public function __construct ($IMGSRC, $canvasWidth, $canvasHeight, $SAVESRC =null) { $this->imgsrc = $IMGSRC; $this->canvaswidth = $canvasWidth; $this->canvasheight = $canvasHeight; $this->savesrc = $SAVESRC; } /** * Generate thumbnail image */ Public function Produce () { $this->createcanvas (); $this->judgeimage (); $this->copyimage (); $this->headerimage (); } /** * Get information on loading images * * Includes length, width, picture type * * @return array containing the image length, width, mime */ Private Function Getimageinfo () { Return getimagesize ($this->imgsrc); } /** * Get the length of the picture * * @return the width of the int picture */ Public Function Getimagewidth () { $imageInfo = $this->getimageinfo (); return $imageInfo [' 0 ']; } /** * Get Picture height * * @return the height of the int image */ Public Function Getimageheight () { $imageInfo = $this->getimageinfo (); return $imageInfo [' 1 ']; } /** * Get the type of picture * * MIME value of @return picture */ Public Function Getimagemime () { $imageInfo = $this->getimageinfo (); return $imageInfo [' MIME ']; } /** * Create Canvas * * Also put the created canvas resource into the property $this->im */ Private Function Createcanvas () { $size = $this->truesize (); $this->im = Imagecreatetruecolor ($size [' width '], $size [' height ']); } /** * Determine the MIME value of the image and decide which function to use * * Also put the created picture resources into the $THIS->DM */ Private Function Judgeimage () { $mime = $this->getimagemime (); Switch ($mime) { Case ' image/png ': $DM = imagecreatefrompng ($this->imgsrc); Break Case ' image/gif ': $DM = imagecreatefromgif ($this->imgsrc); Break Case ' image/jpg ': $DM = imagecreatefromjpeg ($this->imgsrc); Break Case ' image/jpeg ': $DM = imagecreatefromgjpeg ($this->imgsrc); Break } $this->DM = $DM; } /** * Determine the width and height of the image after the thumbnail * * This width and height also as the size of the canvas * * @return the size of an array image after a proportional thumbnail */ Public Function Truesize () { $proportionW = $this->getimagewidth ()/$this->canvaswidth; $proportionH = $this->getimageheight ()/$this->canvasheight; if ($this->getimagewidth () < $this->canvaswidth) && ($this->getimageheight () < $this Canvasheight)) { $trueSize = Array (' width ' = $this->getimagewidth (), ' height ' = = $this->getimageheight ()); } ElseIf ($proportionW >= $proportionH) { $trueSize = Array (' width ' = $this->canvaswidth, ' height ' = = $this->getimageheight ()/$proportionW); } Else { $trueSize = Array (' width ' = $this->getimagewidth ()/$proportionH, ' height ' = $this->canvasheight); } return $trueSize; } /** * Copy the picture to the new canvas * * Images will be scaled in equal proportions and will not deform */ Private Function Copyimage () { $size = $this->truesize (); Imagecopyresized ($this->im, $this->dm, 0, 0, 0, 0, $size [' width '], $size [' height '], $this->getimagewidth () , $this->getimageheight ()); } /** * Output the picture * * The name of the picture is the same as the original picture name * * Path is large picture in small directory under current directory * * If the small directory does not exist, it will be created automatically */ Public Function Headerimage () { $position = Strrpos ($this->imgsrc, '/'); $imageName = substr ($this->imgsrc, ($position + 1)); if ($this->savesrc) { $imageFlode = $this->savesrc. ' /'; } Else { $imageFlode = substr ($this->imgsrc,0, $position). ' /small/'; } if (!file_exists ($imageFlode)) { mkdir ($imageFlode); } $SAVESRC = $imageFlode. $imageName; Imagejpeg ($this->im, $SAVESRC); } } Copy Code

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