A small example of PHP images and watermarks

/** * Image plus watermark (for png/jpg/gif format) * * @author FLYNETCN * * @param $srcImg Original picture * @param $waterImg watermark Picture * @param $savepath Save path * @param $savename Save name * @param $positon Watermark Location * 1: Top left, 2: Top right, 3: center, 4: Bottom station left, 5: Bottom of Right * @param $alpha Transparency--0: Completely transparent, 100: completely opaque * * @return Success--The new image address after adding watermark * Failure---1: The original file does not exist,-2: Watermark picture does not exist,-3: Original file image object failed to build *-4: Watermark file Image Object build failed-5: New picture saved after Watermark failed * @ Edit: bbs.it-home.org */ function Img_water_mark ($SRCIMG, $WATERIMG, $savepath =null, $savename =null, $positon =5, $alpha =30) { $temp = PathInfo ($SRCIMG); $name = $temp [' basename ']; $path = $temp [' dirname ']; $exte = $temp [' extension ']; $savename = $savename? $savename: $name; $savepath = $savepath? $savepath: $path; $savefile = $savepath. ' /'. $savename; $srcinfo = @getimagesize ($SRCIMG); if (! $srcinfo) { return-1; The original file does not exist } $waterinfo = @getimagesize ($WATERIMG); if (! $waterinfo) { Return-2; Watermark picture does not exist } $SRCIMGOBJ = Image_create_from_ext ($SRCIMG); if (! $srcImgObj) { return-3; The original file image object failed to build } $WATERIMGOBJ = Image_create_from_ext ($WATERIMG); if (! $waterImgObj) { return-4; Failed to build Watermark file image Object } Switch ($positon) { 1 Top Left Case 1: $x = $y = 0; Break 2 top Right Case 2: $x = $srcinfo [0]-$waterinfo [0]; $y = 0; Break 3 centering Case 3: $x = ($srcinfo [0]-$waterinfo [0])/2; $y = ($srcinfo [1]-$waterinfo [1])/2; Break 4 bottom Left Case 4: $x = 0; $y = $srcinfo [1]-$waterinfo [1]; Break 5 bottom Right Case 5: $x = $srcinfo [0]-$waterinfo [0]; $y = $srcinfo [1]-$waterinfo [1]; Break Default: $x = $y = 0; } Imagecopymerge ($SRCIMGOBJ, $WATERIMGOBJ, $x, $y, 0, 0, $waterinfo [0], $waterinfo [1], $alpha); Switch ($srcinfo [2]) { Case 1:imagegif ($SRCIMGOBJ, $savefile); Break Case 2:imagejpeg ($SRCIMGOBJ, $savefile); Break Case 3:imagepng ($SRCIMGOBJ, $savefile); Break default:return-5; Save failed } Imagedestroy ($SRCIMGOBJ); Imagedestroy ($WATERIMGOBJ); return $savefile; } function Image_create_from_ext ($imgfile) { $info = getimagesize ($imgfile); $im = null; Switch ($info [2]) { Case 1: $im =imagecreatefromgif ($imgfile); Break Case 2: $im =imagecreatefromjpeg ($imgfile); Break Case 3: $im =imagecreatefrompng ($imgfile); Break } return $im; } Copy Code

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