Detailed explanation of how to customize the size of verification code in PHP_PHP Tutorial

function vCode($num=4,$size=20, $ width=0,$height=0){
!$width && $width = $num*$size*4/5+5;
!$height && $height = $size + 10;
// Removed 0 1 O l and so on
                                                                                                               num; $i++){
                    $code.= $str[mt_rand(0, strlen($str)-1)]; 🎜 >                                                                                                                                               $text_color = imagecolorallocate($im, mt_rand(0,200), mt_rand(0,120), mt_rand(0,120));

                                                                                                                                                      . $back_color);
                                                                                                                                                                    . $i=0;$i<5;$i++){
                                                                                                                                  ,mt_rand (-$width,$width),mt_rand(-$height,$height),mt_rand(30,$width*2),mt_rand(20,$height*2),mt_rand(0,360),mt_rand(0,360),$ font_color);
}
// Draw interference points 255), mt_rand(0,255), mt_rand(0,255));
                                                                     Code
@imagefttext($im, $size, 0, 5, $size+3, $text_color, 'c://WINDOWS//Fonts//simsun.ttc',$code);
header( "Cache-Control: max-age=1, s-maxage=1, no-cache, must-revalidate");
header("Content-type: image/png");
imagepng($im );
                 imagedestroy($im); // 4 characters, size 20
vCode(4,20);
?>




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Copy the code as follows: ?php function vCode($num=4,$size=20, $width=0 ,$height=0){ !$width $width = $num*$size*4/5+5; !$height $height = $size + 10; // Removed 0 1 O l and other $str...