How to modify the style of DedeCms verification code

Modify the file verification code file location include\validateimg.php ##Find

for($i=0;$i<4;$i ) 
{ 
$rndstring .= chr(mt_rand(65,90)); 
}

Changed to

for($i=0;$i<4;$i ) 
{ 
$rndstring .= chr(mt_rand(48,57)); 
}

This function is to generate random characters. If you see no numbers inside, it is to generate a character keyboard. The range of codes is originally mt_rand(65,90). This 65 to 90 is the keyboard code for the capital letters A to Z. Now modified to (48,57) represents the keyboard code from 0 to 9: mt_rand(48,57).

Also,

$bgcolor = ImageColorAllocate($im, 248,212,20); 
$black = ImageColorAllocate($im, 0,0,0);

such as

0，0，0 表示 黑色， 
255，0，0 表示纯红， 
0，255，0 表示纯绿， 
0，0，255 表示纯蓝。

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