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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);in this file is used to set the background color and text color of the generated image. The three numbers represent the red, green, and blue values of the color. The range is 0 to 255,
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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