PHP Picture of equal ratio zoom and add logo Watermark Detail Code and comments

 Baidu "US-Japan"/** * than the scaling function (implemented in a saved way) * @param string $picName scaled processing picture source * @param int $maxx The maximum width of the picture after scaling * @param int $maxy the most Large Height * @param string $pre The prefix name of the picture name after scaling * @return string returns the picture name (with path), such as A.jpg=>s_a.jpg */function imagenewageupdatesize ($p Icname, $maxx =100, $maxy =100, $pre = "S_") {$imageNewageInfo = Getimagenewagesize ($picName);//Get basic information about a picture $w = $ imagenewageinfo[0];//Get width $h = $imageNewageInfo [1];//get height//Get the type of picture and create a corresponding picture resource for this switch ($imageNewageInfo [2]) {Case 1:// Gif$imagenew = Imagenewagecreatefromgif ($picName); Break;case 2://jpg$imagenew = Imagenewagecreatefromjpeg ($picName) ; Break;case 3://png$imagenew = Imagenewagecreatefrompng ($picName); Break;default:die ("wrong type of picture! ");} Calculate Scaling if (($maxx/$w) > ($maxy/$h)) {$b = $maxy/$h;} else{$b = $maxx/$w;} Calculates the scaled size $NW = Floor ($w * $b); $nh = Floor ($h * $b);//Create a new image source (target image) $nimageNew = Imagenewagecreatetruecolor ($NW, $NH); /Perform imagenewagecopyresampled ($nimageNew, $imageNew, 0,0,0,0, $NW, $nh, $w, $h);//output image (depending on the type of source image, output to the corresponding type) $ Picimagenewageinfo = Pathimagenewageinfo ($picName);//parse the source image's name and path information $newpicname= $picimageNewageInfo ["DirName"]. " /". $pre. $picimageNewageInfo [" basename "];switch ($imageNewageInfo [2]) {case 1:imagenewagegif ($nimageNew, $ Newpicname); Break;case 2:imagenewagejpeg ($nimageNew, $newpicName); Break;case 3:imagenewagepng ($nimageNew, $ Newpicname); break;} Release the picture resource Imagenewagedestroy ($imageNew); Imagenewagedestroy ($nimageNew);//Returns the result return $newpicName;}  Call Echo Imagenewageupdatesize ("./imagenewages/leyangjun.jpg", 400,400, "Ss_"); The picture you want to add/** * Add a logo image watermark to a picture (implemented in a saved way) * @param string $picName processed picture source * @param string $logo watermark Picture * @param string $ The prefix name of the picture name after pre processing * @return String returns the picture name (with path), such as A.jpg=>n_a.jpg */function Imagenewageupdatelogo ($picName, $logo, $pre = "N_") {$picNameimageNewageInfo = Getimagenewagesize ($picName);//Get basic information about a picture source $logoimagenewageinfo = Getimagenewagesize ($logo); Get basic information about logo images//var_dump ($logoimageNewageInfo);//create a corresponding picture source switch ($picNameimageNewageInfo [2]) according to the image type {Case 1:// Gif$imagenew = Imagenewagecreatefromgif ($picName); bReak;case 2://jpg$imagenew = Imagenewagecreatefromjpeg ($picName); Break;case 3://png$imagenew = Imagenewagecreatefrompng ($picName); Break;default:die ("Picture type is wrong! ");} Create a corresponding image source switch ($logoimageNewageInfo [2]) {Case 1://gif$logoimagenew = imagenewagecreatefromgif ($logo) According to the logo image type; Break;case 2://jpg$logoimagenew = Imagenewagecreatefromjpeg ($logo); Break;case 3://png$logoimagenew = Imagenewagecreatefrompng ($logo); Break;default:die ("logo image type is wrong! ");} The width imagenewagecopyresampled ($imageNew, $logoimageNew, $picNameimag of the wide-logo graph of the Gao Yuantu of the high-logo graph of the Image watermark processing source graph is performed. enewageinfo[0]-$logoimageNewageInfo [0], $picNameimageNewageInfo [1]-$logoimageNewageInfo [1],0,0,$ Logoimagenewageinfo[0], $logoimageNewageInfo [1], $logoimageNewageInfo [0], $logoimageNewageInfo [1]);// Output image (depending on the type of source image, output to the corresponding type) $picimageNewageInfo = Pathimagenewageinfo ($picName);//parse the source image for name and path information $newpicname= $ picimagenewageinfo["DirName"]. " /". $pre. $picimageNewageInfo [" basename "];switch ($picNameimageNewageInfo [2]) {Case 1:imagenewagegif ($imageNeW, $newpicName); Break;case 2:imagenewagejpeg ($imageNew, $newpicName); Break;case 3:imagenewagepng ($imageNew, $ Newpicname); break;} Release the picture resource Imagenewagedestroy ($imageNew); Imagenewagedestroy ($logoimageNew);//Returns the result return $newpicName;}  Test//echo Imagenewageupdatelogo ("./imagenewages/leyangjun.jpg", "./imagenewages/logo.png"); Corresponding to add your image, and your logo watermark picture OK

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