Add text watermark to existing image PHP code

PHP class Library to the existing image plus text watermark, the code is not very perfect, welcome everyone to advise! The code is as follows: /*php Picture Plus text Watermark class Library qq:3697578482 sad song. This kind of library temporarily supports only text watermark, the position is the bottom right corner, color random Call Method: 1, in the need to watermark the top of the file to introduce the class library: Include_once ' imageclass.php '; 2. Declaring a new class: $tpl =new Image_fu; 3. Provide parameters for image watermark: $TPL->img (image path, watermark text, font path, font size, font angle); For example: $tpl->img (' abc.jpg ', ' This is the watermark text ', ' Ziti.ttf ', 30,0) */ Class image_fu{ Private $image; Private $img _info; Private $img _width; Private $img _height; Private $img _im; Private $img _text; Private $img _ttf= '; Private $img _new; Private $img _text_size; Private $img _JD; function img ($img = ', $txt = ', $ttf = ', $size =12, $jiaodu =0) { if (Isset ($img) &&file_exists ($img)) {//detect if a picture exists $this->image = $img; $this->img_text= $txt; $this->img_text_size= $size; $this->img_jd= $jiaodu; if (file_exists ($ttf)) { $this->img_ttf= $ttf; }else{ Exit (' Font file: '. $ttf. ' does not exist! '); } $this->imgyesno (); }else{ Exit (' picture file: '. $img. ' does not exist '); } } Private Function Imgyesno () { $this->img_info =getimagesize ($this->image); $this->img_width = $this->img_info[0];//picture width $this->img_height= $this->img_info[1];//Pictures High Detecting picture types Switch ($this->img_info[2]) { Case 1: $this->img_im = imagecreatefromgif ($this->image); Case 2: $this->img_im = imagecreatefromjpeg ($this->image); Case 3: $this->img_im = imagecreatefrompng ($this->image); Default:exit (' image format does not support Watermark '); } $this->img_text (); } Private Function Img_text () { Imagealphablending ($this->img_im,true); Set color $color =imagecolorallocate ($this->img_im,rand (0,255), Rand (0,255), Rand (0,255)); $txt _height= $this->img_text_size; $txt _jiaodu= $this->img_jd; $ttf _im=imagettfbbox ($txt _height, $txt _jiaodu, $this->img_ttf, $this->img_text); $w = $ttf _im[2]-$ttf _im[6]; $h = $ttf _im[3]-$ttf _im[7]; $w = $ttf _im[7]; $h = $ttf _im[8]; unset ($ttf _im); $txt _y = $this->img_height-$h; $txt _x = $this->img_width-$w; $txt _y = 0; $txt _x = 0; $this->img_new= @imagettftext ($this->img_im, $txt _height, $txt _jiaodu, $txt _x, $txt _y, $color, $this->img_ TTF, $this->img_text); @unlink ($this->image);//Delete picture Switch ($this->img_info[2]) {//Get the format of the background picture Case 1:imagegif ($this->img_im, $this->image); Case 2:imagejpeg ($this->img_im, $this->image); Case 3:imagepng ($this->img_im, $this->image); Default:exit (' watermark image failed '); } } Show pictures function Img_show () {echo ' image. ' border= ' 0 "alt=" '. $this->img_text. '/> ';} Freeing memory Private Function img_nothing () { unset ($this->img_info); Imagedestroy ($this->img_im); } } ?> Copy Code

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