PHP image automatically add watermark code, PHP image watermark function code

/* * 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); * * 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 picture $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, "", "http://blog.csdn.net/longware/", 5, "#ff0000"); Image watermark $waterimage = "./hanweb_shuiyin.gif";//Watermark Picture Path Imagewatermark ($uploadfile, 0, $waterimage); echo ""; } Else { echo "fail "; } } ?> Copy Code

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