A difficult question. the verification code is not displayed.

A difficult question: the verification code is not displayed. this post is Last edited by ziluoapo4 from 2014-10-12:33:16. the general verification code is not displayed. The reason is: 1 & nbsp; there is a BOM & nbsp; header, 2 & nbsp; extensionphp_gd2.dll is not enabled (that is, remove the semicolon), but this is not the above two reasons, because I have checked. A difficult problem. the verification code is not displayed.

This post was last edited by ziluoapo4 at 17:33:16

Generally, the verification code is not displayed. nowhere is it because: 1 has a BOM header, and 2 extension = php_gd2.dll is not enabled (that is, remove the semicolon)

But I am not the above two reasons, because I have checked.
There is a solution in the forum that is to add ini_set ('display _ errors ', 'off') at the beginning of the page; I also add, (see this post: http://bbs.csdn.net/topics/350011289) or not,
However, it is strange that other cms programs show verification codes. The php Version I use is PHP Version 5.3.28.
What if I say this is a difficult problem?

------ Solution ----------------------
Modified it. OK, mainly in the font. you have not defined the ROOT_PATH, so you cannot get $ this-> font = ROOT_PATH. '/font/elephant. ttf ';
You can change the ROOT_PATH to the correct path in define mode. now the test directory is like this.
Test. php
Font/elephant. ttf
Set ROOT_PATH in test. php to define ('root _ path', dirname (_ FILE __));

The complete test code is as follows:

// Verification code
Define ('root _ path', dirname (_ FILE __));

// Verification code
Class ValidateCode {
Private $ charset = 'abcdefghkmnprstuvwxyzabcdefghkmnprstuvwxyz23456789 '; // random factor
Private $ code; // verification code
Private $ codelen = 4; // verification code length
Private $ width = 130; // width
Private $ height = 50; // height
Private $ img; // graphical resource handle
Private $ font; // The specified font.
Private $ fontsize = 20; // specify the font size
Private $ fontcolor; // specifies the font color.
     
// Constructor initialization
Public function _ construct (){
$ This-> font = ROOT_PATH. '/font/elephant. ttf ';
}
     
// Generate random code
Private function createCode (){
$ _ Len = strlen ($ this-> charset)-1;
For ($ I = 0; $ I <$ this-> codelen; $ I ++ ){
$ This-> code. = $ this-> charset [mt_rand (0, $ _ len)];
}
}
     
// Generate background
Private function createBg (){
$ This-> img = imagecreatetruecolor ($ this-> width, $ this-> height );
$ Color = imagecolorallocate ($ this-> img, mt_rand (157,255), mt_rand (157,255), mt_rand (157,255 ));
Imagefilledrectangle ($ this-> img, 0, $ this-> height, $ this-> width, 0, $ color );
}
     
// Generate text
Private function createFont (){
$ _ X = $ this-> width/$ this-> codelen;
For ($ I = 0; $ I <$ this-> codelen; $ I ++ ){
$ This-> fontcolor = imagecolorallocate ($ this-> img, mt_rand (0,156), mt_rand (0,156), mt_rand (0,156 ));
Imagettftext ($ this-> img, $ this-> fontsize, mt_rand (-30, 30), $ _ x * $ I + mt_rand (1.4), $ this-> height, $ this-> fontcolor, $ this-> font, $ this-> code [$ I]);
}
}
     
// Generate lines and snowflakes
Private function createLine (){
For ($ I = 0; $ I <6; $ I ++ ){
$ Color = imagecolorallocate ($ this-> img, mt_rand (0,156), mt_rand (0,156), mt_rand (0,156 ));
Imageline ($ this-> img, mt_rand (0, $ this-> width), mt_rand (0, $ this-> height), mt_rand (0, $ this-> width), mt_rand (0, $ this-> height), $ color );
}
For ($ I = 0; I I <100; $ I ++ ){