A large number of exceptions suddenly occurred when you created the verification code. thank you for your help.

When I created a verification code, a large number of errors suddenly occurred. could you please help me? thank you for writing a php script for the verification code. I first started to prompt that the image function is unavailable, so I added the php5-gd after the installation is complete, and found that still tishi can not find the function so I used sudo & nbsp; etcinit. dapache2 & nbsp; focus-reload and then & nbsp; the system prompts function problems, but displays a large number of warning information. I checked the modification & nbs creation verification code and suddenly encountered a large number of errors. please take a look, thank you

I'm trying to write a php script for a verification code, first starting to prompt that the image function is unavailable, so I added a php5-gd
After the installation is complete, it is found that the function still cannot be found by Tieshi.
So I used sudo/etc/init. d/apache2 focus-reload.
Then a function problem is prompted, but a large amount of warning information is displayed.
I have checked and modified the php. ini file error. report = E_ALL &~ E_NOTICE
Restart the server,
The verification code is as follows:

 session_start();
//set some important identfy constants
define('IDENTFY_NUM',5);
define('IDENTFY_WIDTH',75);
define('IDENTFY_HEIGT',25);
//create the random pass-phrase
$pass_phrase="";
for($i=0;$i
 $pass_phrase.=chr(rand(97,122));

}
$_SESSION['pass_phrase']=sha1($pass_phrase);
$img=imagecreatetruecolor(IDENTFY_WIDTH,IDENTFY_HEIGHT);
$bg_color=imagecolorallocate($img,255,255,255);
$text_color=imagecolorallocate($img,0,0,0);
$graphic_color=imagecolorallocate($img,64,64,64);

imagefilledrectangle($img,0,0,IDENTFY_WIDTH,IDENTFY_HEIGHT,$bg_color);

//Draw random lines
for($i=0;$i<5;$i++){
imageline($img,0,rand()%IDENTFY_HEIGHT,IDENTFY_WIDTH,rand()%INDENTFY_HEIGHT,$graphic_color);
}
for($i=0;$i<50;$i++){
imagesetpixel($img,rand()%IDENTFY_WIDTH,rand()%IDENTFY_HEIGHT,$graphic_color);

}
//Draw the string
imagettftext($img,18,0,5,IDENTFY-5,$text_color,"Courier New Bold.ttf",$pass_phrase);
header("Content-type:image/png");
imagepng($img);
imagedestroy($img);
?>

------ Solution --------------------
Check by yourself. The definition and usage of constants are inconsistent.
------ Solution --------------------
Obviously 23 rows have been prompted. the denominator in your division cannot be zero because there is an incorrect inversion here. $ the img variable contains miscellaneous values, so that the imagesetpixel function of 27 rows does not have an available image resource.

for($i=0;$i<5;$i++){
        imageline($img,0,rand()%IDENTFY_HEIGHT,IDENTFY_WIDTH,rand()%INDENTFY_HEIGHT,$graphic_color);
    }

 for($i=0;$i<50;$i++){
        imagesetpixel($img,rand()%IDENTFY_WIDTH,rand()%IDENTFY_HEIGHT,$graphic_color);
 
    }