PHP Image watermark function code (support picture and text)

/* * Function: PHP image watermark (watermark supports picture or text) Parameters * $groundImage background image, that is, need to add a watermark image, temporarily only support gif,jpg,png format; * $waterPos watermark position, there are 10 kinds of states, 0 is a random position; * For the top of the left, 2 for the top center, 3 for the top right; In the middle of the left, 5 for the Middle center, 6 for the middle right; *7 for the bottom of the left, 8 for the bottom center, 9 for the bottom of the right; * $waterImage image watermark, that is, as a watermark image, temporarily only support gif,jpg,png format; * $waterText text watermark, that is, the text as a watermark, support ASCII code, does not support Chinese; * $textFont Text size, value 1, 2, 3, 4 or 5, default is 5; * $textColor text color, value is hexadecimal color value, default is #ff0000 (red); * http://bbs.it-home.org * Note: Support GD 2.0,support FreeType, gif Read, GIF Create, JPG, PNG * $waterImage and $waterText best not to use at the same time, choose one of them, priority to use the $waterImage. * When the $waterimage is valid, the parameters $waterstring, $stringFont, $stringColor are not effective. * The watermark image has the same file name as the $groundImage. * Author: longware @ 2004-11-3 14:15:13 */ function Imagewatermark ($groundImage, $waterPos =0, $waterImage = "", $waterText = "", $textFont =5, $textColor = "#FF0000") { $isWaterImage = FALSE; $FORMATMSG = "Does not support this file format, please use the picture processing software to convert the picture to GIF, JPG, PNG format. "; Read Watermark File if (!empty ($waterImage) && file_exists ($waterImage)) { $isWaterImage = TRUE; $water _info = getimagesize ($waterImage); $water _w= $water _info[0];//To obtain the width of the watermark image $water _h= $water _info[1];//to obtain a high watermark image Switch ($water _info[2])//Get the format of the watermark picture { Case 1: $water _im = Imagecreatefromgif ($waterImage); Case 2: $water _im = Imagecreatefromjpeg ($waterImage); Case 3: $water _im = Imagecreatefrompng ($waterImage); Default:die ($FORMATMSG); } } Read background picture if (!empty ($groundImage) && file_exists ($groundImage)) { $ground _info = getimagesize ($groundImage); $ground _w= $ground _info[0];//Get the width of the background image $ground _h= $ground _info[1];//get a high background picture Switch ($ground _info[2])//Get the format of the background picture { Case 1: $ground _im = Imagecreatefromgif ($groundImage); Case 2: $ground _im = Imagecreatefromjpeg ($groundImage); Case 3: $ground _im = Imagecreatefrompng ($groundImage); Default:die ($FORMATMSG); } } Else { Die ("The picture that needs watermark does not exist!") "); } Watermark Location if ($isWaterImage)//Picture watermark { $w = $water _w; $h = $water _h; $label = "Picture"; } else//text watermark { $temp = Imagettfbbox (ceil ($textFont *2.5), 0, "./cour.ttf", $waterText);//Gets the range of text that uses TrueType fonts $w = $temp [2]-$temp [6]; $h = $temp [3]-$temp [7]; Unset ($temp); $label = "Text Area"; } if ($ground _w< $w) | | ($ground _h< $h)) { echo "The length or width of the picture that needs to be watermarked is more than a watermark". $label. " Still small, unable to generate watermark! "; Return } Switch ($waterPos) { Case 0://Random $posX = rand (0, ($ground _w-$w)); $posY = rand (0, ($ground _h-$h)); Break Case 1://1 for top left $posX = 0; $posY = 0; Break Case 2://2 centered on the top $posX = ($ground _w-$w)/2; $posY = 0; Break Case 3://3 for top right $posX = $ground _w-$w; $posY = 0; Break Case 4://4 for the middle left $posX = 0; $posY = ($ground _h-$h)/2; Break Case 5://5 centered in the middle $posX = ($ground _w-$w)/2; $posY = ($ground _h-$h)/2; Break Case 6://6 for the middle right $posX = $ground _w-$w; $posY = ($ground _h-$h)/2; Break Case 7://7 for Bottom left $posX = 0; $posY = $ground _h-$h; Break Case 8://8 centered at bottom $posX = ($ground _w-$w)/2; $posY = $ground _h-$h; Break Case 9://9 for bottom right $posX = $ground _w-$w; $posY = $ground _h-$h; Break default://Random $posX = rand (0, ($ground _w-$w)); $posY = rand (0, ($ground _h-$h)); Break } To set the color blending mode of an image Imagealphablending ($ground _im, true); if ($isWaterImage)//Picture watermark { Imagecopy ($ground _im, $water _im, $posX, $posY, 0, 0, $water _w, $water _h);//copy watermark to target file } else//text watermark { if (!empty ($textColor) && (strlen ($textColor) ==7)) { $R = Hexdec (substr ($textColor,)); $G = Hexdec (substr ($textColor, 3,2)); $B = Hexdec (substr ($textColor, 5)); } Else { Die ("Watermark text color format is not correct! "); } Imagestring ($ground _im, $textFont, $posX, $posY, $waterText, Imagecolorallocate ($ground _im, $R, $G, $B)); } Create a picture after a watermark @unlink ($groundImage); Switch ($ground _info[2])//Get the format of the background picture { Case 1:imagegif ($ground _im, $groundImage); Case 2:imagejpeg ($ground _im, $groundImage); Case 3:imagepng ($ground _im, $groundImage); Default:die ($ERRORMSG); } Freeing memory if (Isset ($water _info)) unset ($water _info); if (Isset ($water _im)) Imagedestroy ($water _im); unset ($ground _info); Imagedestroy ($ground _im); } //------ if (Isset ($_files) &&!empty ($_files[' userfile ']) && $_files[' userfile ' [' Size ']>0] { $uploadfile = "./". Time (). " _ ". $_files[' userfile ' [' name ']; if (copy ($_files[' userfile ' [' tmp_name '], $uploadfile)) { echo "OK "; Text watermark Imagewatermark ($uploadfile, 0, "", "Your Water text", 9, "#EBEBEB"); Image watermark $waterImage = "./images/watermark.gif";//Watermark Picture Path Imagewatermark ($uploadfile, 9, $waterImage); echo ""; } Else { echo "Fail "; } } ?> Copy Code

