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為什么完全按照老師寫的代碼驗證嗎出來會出現2層很多數字不是4位的

<?php

require_once 'string.func.php';

$width = 80;

$height = 28;

$image = imagecreatetruecolor($width, $height);

$white = imagecolorallocate($image, 255, 255, 255);

$black = imagecolorallocate($image, 0, 0, 0);

imagefilledrectangle($image, 1, 1, $width-2, $height-2, $white);

$type = 1;

$length = 4;

$chars = buildRandomString($type, $length);

$sess_name = "verify";

$_SESSION[$sess_name] = $chars;

$fontfiles = array(

? ? "MSYH.TTF",

? ? "MSYHBD.TTF",

? ? "SIMFANG.TTF",

? ? "SIMHEI.TTF",

? ? "SIMKAI.TTF",

? ? "SIMSUN.TTC"?

);

for ($i = 0; $i < $length; $i ++) {

? ? $size = mt_rand(14, 18);

? ? $angle = mt_rand(- 15, 15);

? ? $x = 5 + $i * $size;

? ? $y = mt_rand(20, 26);

? ? $fontfile = "../fonts/".$fontfiles[mt_rand(0,count($fontfiles)-1)];

? ? $color = imagecolorallocate($image, mt_rand(50,90), mt_rand(80,200), mt_rand(90,180));

? ? $text = substr($chars, $i, $length);

? ? imagettftext($image, $size, $angle, $x, $y, $color, $fontfile, $text);

}

header("content-type:image/gif");

imagegif($image);

imagedestroy($image);

小龍upup

2017-04-17

源自：手把手教你實現電商網站后臺開發 2-1

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小龍upup 提問者
2017-04-17

<?php
function?buildRandomString($type=1,$length=4){
????if?($type?==?1)?{
????????$chars?=?join("",?range(0,?9));
????}?elseif?($type?==?2)?{
????????$chars?=?join("",?array_merge(range('a',?'z'),?range('A',?'Z')));
????}?elseif?($type?==?3)?{
????????$chars?=?join("",?array_merge(range('a',?'z'),?range('A',?'Z'),?range(0,?9)));
????}
????if?($length?>?strlen($chars))?{
????????exit("字符串長度不夠");
????}
????$chars?=?str_shuffle($chars);
????return?substr($chars,?0,?$length);
}