Prompt call an undefined function exif_imagetype of solution when ThinkPHP does text watermarking

In this paper, an example is given to describe the solution of prompting call an undefined function exif_imagetype () when ThinkPHP makes text watermarking. Share it for your reference. The details are as follows:

1. Problem description:

ThinkPHP is a text watermark. Today, when I make an electronic invitation, I post a greeting on the picture. I find that I can't get the picture type when I report an error directly, such as gif, jpg, etc., and prompt call an undefined function exif_imagetype ().

2. Solution:

This error is the configuration problem of php. in. Just open it: open the extension extension=php_exif. dll. If it doesn't work again, put extension=php_mbstring.dll before extension=php_exif. dll
Note: extension=php_exif. dll extension to open
Class file: The code for wptext_class. php is as follows:

<?php

/*

PHP Add a text watermark class  V1.0

 By: Yu Tiedun

 Mailbox: 

 Date of modification: 2010-03-07

 Supports picture formats: gif, jpg, png

 The position of the watermark can be adjusted as needed 

 If it can be modified better, , Please send 1 Give me your share 

*/

class WaterPrint

{

// Class start 

    public $text, $color, $size, $font, $angle, $px, $py, $im;

// Text to add  

public function GetWpText($text)

{

   $this->text = $text;

}

// Add the color of the text 

public function GetFtColor($color)

{

   $this->color = $color;

}

// Add the font of the text 

public function GetFtType($font)

{

   $this->font = $font;

}

  

// Add the size of the text 

public function GetFtSize($size)

{

   $this->size = $size;

}

// Angle of rotation of text 

public function GetTtAngle($angle)

{

   $this->angle = $angle;

}

// Where to add text 

public function GetTtPosit()

{

   $this->px = 10;

   $this->py = imagesy($this->im) - 20;

}

// Add 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>";

}

// Class end  

}

?>

Call page: index. php code is as follows:

<?php

header("Content-type: text/html; charset=gbk");

require("wptext_class.php");

$pict = "images/button2.png"; // Target picture 

//$text = "XP/Vista/Win7"; // Text to add 

$text = " Text watermarking test ";

$text = iconv("gb2312","utf-8",$text); // Prevent Chinese garbled codes 

$size = 20; // Text size 

$font = "c:/windows/fonts/arial.ttf"; // Font 

$angle = 0; // Angle of rotation , 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 the results </a>

I hope this article is helpful to everyone's ThinkPHP framework programming.