技术博客初体验~

初次涉及PHP，获取验证码小程序，代码附上<?php
header('content-type:text/html;charset=UTF-8');
function test($type){
switch($type){
case 1:
// echo (rand(0,9)
// echo(rand(0,9)
// echo (rand(0,9)
// echo (rand(0,9))
echo rand(0,9);
echo rand(0,9);
echo rand(0,9);
echo rand(0,9);
break;
case 2:
function randomkeys($length){
$pattern = 'abcdefghijklmnopqrstuvwxyz';
for($i=0;$i<$length;$i++){
$key .=$pattern{rand(0,$length)};
}
return $key;
}
echo randomkeys(4);
break;
case 3:
function randomkeys($length1){
$pattern = '0123456789abcdefghijklmnopqrstuvwxyz';
for($i=0;$i<$length1;$i++){
$key .=$pattern{rand(0,$length1)};
}
return $key;
}
echo randomkeys(4);
break;
}
}
test(rand(1,3));

?>

链接见这里：https://github.com/HTTZHDU/identifying-code