PHP image processing class thumbnail plus watermark

Use of two image system functions

imagecopymerge- Copy and merge part of an image

imagecopyresampled-resampling and resizing copies of portions of images

/* How to know the size and type of the picture cannot confirm the calling function: Imagecreatefrompng/jpeg ... Can be left alone the width and height of the picture is known as an important function getimagesize () *//* want to manipulate the picture first the size of the picture, type information to get a watermark: is to copy the specified watermark to the target, and add transparency effect thumbnail: is to copy the big picture to the small size screen * * Class Imagetool{//imageinfo analysis picture Information//return Array () public static function Imageinfo ($image) {//Determine if the picture exists if (!file_ Exists ($image)) {return false;} $info = getimagesize ($image); if ($info = = False) {return false;} At this point the info analysis is an array of $img[' width ' = $info [0]; $img [' height '] = $info [1];//analysis image suffix $img[' ext '] = substr ($info [' MIME '], Strpos ($info [' MIME '], '/') +1); return $img;} /* Watermark string $DST $water watermark Small image $save not filled, the default replaces the original figure $alpha Transparency $pos watermark position 1234, clockwise */public static funct Ion Water ($DST, $water, $save =null, $pos =2, $alpha =50) {//Ensure that two images exist if (!file_exists ($DST) | |!file_exists ($water)) { return false;} 1. Ensure that the watermark is not larger than the picture to be manipulated $dinfo = Self::imageinfo ($DST); $winfo = Self::imageinfo ($water);//judging if ($winfo [' height '] > $ dinfo[' Height ' | | $winfo [' width '] > $dinfo [' width ']) {return false;} Two graphs, read on the canvas, but the picture may be PNG, possibly jpeg, what function to read $dfunc = ' imagecreatEfrom '. $dinfo [' ext ']; $wfunc = ' Imagecreatefrom '. $winfo [' ext '];if (!function_exists ($dfunc) | |!function_exists ($ Wfunc)) {return false;} Dynamic load function to create canvas $dim = $dfunc ($DST); Create the canvas to be manipulated $wim = $wfunc ($water); Create watermark canvas//calculate pasted coordinates based on Watermark location switch ($pos) {case 0;//upper Left $posx = 0; $posy = 0;break;case 1;//upper right corner $posx = $dinfo [' width ']-$winfo [' width ']; $posy = 0;break;case 2; lower left corner $posx = 0; $posy = $dinfo [' height ']-$winfo [' Height '];break;default://default lower right corner $posx = $dinfo [' width ']-$winfo [' width '] $posy = $dinfo [' height ']-$winfo [' Height '];} Where is the watermark?  Imagecopymerge (Resource $dst _im, resource $src _im, int $dst _x, int $dst _y, int $src _x, int $src _y, int $src _w, int $src _h, int $pct) Imagecopymerge ($dim, $wim, $posx, $posy, 0,0, $winfo [' width '], $winfo [' height '], $alpha); if (! $save) {$save = $DST; unlink ($DST);//delete original}//save picture $createfunc = ' image '. $dinfo [' ext ']; $createfunc ($dim, $save);//Destroy Picture Imagedestroy ($dim); Imagedestroy ($wim); return true;} /*thumb generate thumbnails, such as scaling, left white */public static function thumb ($DST, $save=null, $width =200, $height =200) {//First determine if the picture to be processed exists $dinfo = Self::imageinfo ($DST); if ($dinfo = = False) {return false;} Calculate the scale $calc = min ($width/$dinfo [' width '], $height/$dinfo [' height ']), or//create a canvas $dfunc = ' imagecreatefrom ' of the original diagram. $dinfo [' Ext ']; $dim = $dfunc ($DST);//create thumbnail drawing cloth $tim = Imagecreatetruecolor ($width, $height);//Create white-filled thumbnail drawing cloth $white = Imagecolorallocate ($tim, 255,255,255);//fill the thumbnail canvas imagefill ($tim, 0,0, $white);//copy and thumbnail $dwidth = (int) $dinfo [' Width ']*$ Calc; $dheight = (int) $dinfo [' Height ']* $calc; $paddingx = ($width-$dwidth)/2; $paddingy = ($height-$dheight)/2;imageco Pyresampled ($tim, $dim, $paddingx, $paddingy, 0,0, $dwidth, $dheight, $dinfo [' width '], $dinfo [' height ']);//Save picture if (!$ Save) {$save = $DST; unlink ($DST);} $createfun = ' image '. $dinfo [' ext ']; $createfun ($tim, $save); Imagedestroy ($dim); Imagedestroy ($tim); return true;}

To invoke a parameter:

Call  the Add watermark echo imagetool::water (' Original image address ', ' Add watermark image address ', ' generate picture ')? ' Ok ': false;

Call thumbnail echo imagetool::thumb (' original address ', ' Generate image address ', 200,200)? ' Ok ': false;

PHP image processing class thumbnail plus watermark