Thinkphp makes a text watermark and solves call an undefined function exif_imagetype ()

Thinkphp makes a text watermark. Today, when I make an electronic invitation, I paste the greeting language on the image and find that the image type cannot be obtained because the error is always reported, such as gif and jpg, today, I wrote a watermark class and solved the call an undefined function exif_imagetype (). This error is php. in configuration problem. Open extended extension = php_exif.dll and put extension = php_mbstring.dll in front of extension = php_exif.dll.

Note: extension = php_exif.dll extension must be enabled.

Class File: wptext_class.php

The code is as follows:

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<? Php /* PHP add text watermark class V1.0 Author: Yu Tiedun Mail box: Modified on: Supported image formats: gif, jpg, and png Adjust the watermark position as needed If the modification is better, please send me a copy. */ Class WaterPrint { // Starts the class Public $ text, $ color, $ size, $ font, $ angle, $ px, $ py, $ im; // Text to be added Public function GetWpText ($ text)     { $ This-> text = $ text;     } // Add text color Public function GetFtColor ($ color)     { $ This-> color = $ color;     } // Add text font Public function GetFtType ($ font)     { $ This-> font = $ font;     }   // Add the text size Public function GetFtSize ($ size)     { $ This-> size = $ size;     } // Text rotation angle Public function GetTtAngle ($ angle)     { $ This-> angle = $ angle;     } // Add text position Public function GetTtPosit ()     { $ This-> px = 10; $ This-> py = imagesy ($ this-> im)-20;     }     // Add a text watermark Public function AddWpText ($ pict)     { $ Ext = exif_imagetype ($ pict ); Switch ($ ext ){ Case 1: $ Picext = "gif "; $ This-> im = imagecreatefromgif ($ pict ); Break; Case 2: $ Picext = "jpg "; $ This-> im = imagecreatefromjpeg ($ pict ); Break; Case 3: $ Picext = "png "; $ This-> im = imagecreatefrompng ($ pict ); Break; Default: $ This-> Errmsg ("unsupported file format! "); Break;    } // $ This-> picext = $ picext; $ This-> GetTtPosit (); $ Im = $ this-> im; $ Size = $ this-> size; $ Angle = $ this-> angle; $ Px = $ this-> px; $ Py = $ this-> py; $ Color = $ this-> color; $ Font = $ this-> font; $ Text = $ this-> text; $ Color = imagecolorallocate ($ im, 255, 0, 0 ); Imagettftext ($ im, $ size, $ angle, $ px, $ py, $ color, $ font, $ text ); Switch ($ picext ){ Case "gif ": Imagegif ($ im, $ pict ); Break; Case "jpg ": Imagejpeg ($ im, $ pict, 100 ); Break; Case "png ": Imagealphablending ($ im, false ); Imagesavealpha ($ im, true ); Imagepng ($ im, $ pict ); Break;    } Imagedestroy ($ im );     } // Error message prompt Public function Errmsg ($ msg)     { Echo "<script language = 'javascript '> alert ('". $ msg. "'); </script> ";     } // End the class } ?>

Call Page: index. php

The code is as follows:

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<? Php Header ("Content-type: text/html; charset = gbk "); Require ("wptext_class.php "); $ Pict = "images/button2.png"; // target image // $ Text = "XP/Vista/Win7"; // the text to be added $ Text = "text watermark test "; $ Text = iconv ("gb2312", "UTF-8", $ text); // prevents Chinese garbled characters $ Size = 20; // text size $ Font = "c:/windows/fonts/arial. ttf"; // font $ Angle = 0; // rotation angle, counterclockwise $ Wptext = new WaterPrint (); $ Wptext-> GetWpText ($ text ); $ Wptext-> GetFtSize ($ size ); $ Wptext-> GetFtType ($ font ); $ Wptext-> GetTtAngle ($ angle ); $ Wptext-> AddWpText ($ pict ); $ Wptext = null; ?> <A href = "images/button2.png" target = "_ blank"> View results </a>