Rumah > Soal Jawab > teks badan
<?php
check_code();
//Menjana aksara atau nombor secara rawak untuk kod pengesahan
fungsi check_code($width=100, $height=50,$num=4, $type = 'jpeg')
{
$i=imagecreate($width,$height);
$string='';
for($j=0;$j<$num;$j++)
{ " $ascii=mt_rand(48,57);
pecah;
kes 1:
$ascii=mt_rand(65,90); pecah;
}
} $string.=sprintf('%c ' ,$ ascii); //penyahkodan aksara ascii
} }
//Jana warna latar belakang kod pengesahan (randbg(): panggilan fungsi)
imagefilledrectangle($i,0,0,$ $height,randbg ($i));
//Jana gangguan rawak (randpix(): panggilan fungsi)untuk($j=0;$j<50;$j++)
{
imagesetpixel ($i,mt_rand(0,$width),mt_rand(0,$height) ,randpix($i));
}
//Tulis
untuk($j=0 ;$j< $num;$j++)
{
$fuc='imej'. $type ;
$have='cotent-type:image'.$type;
if(function_exists($fuc))
{
header($have);
$fuc($i);
}.
fungsi randbg ($ i)
kembali ImageColorallocate ($ i, mt_rand (135,255) ,, mt_rand (135,255), mt_rand (135,255));
//Elemen gangguan atau modul fungsi warna aksara
fungsi randpix($i)
{
return imagecolorallocate($i,mt_rand(0,135),mt_rand(0,135),mt_rand(0,135) }
?>
路过2017-11-08 13:48:01
这是个验证码类,你可以参考一下 <?php class Captcha { private $width; private $height; private $codeNum; private $code; private $im; function __construct($width=80, $height=20, $codeNum=4) { $this->width = $width; $this->height = $height; $this->codeNum = $codeNum; } function showImg() { //创建图片 $this->createImg(); //设置干扰元素 $this->setDisturb(); //设置验证码 $this->setCaptcha(); //输出图片 $this->outputImg(); } function getCaptcha() { return $this->code; } private function createImg() { $this->im = imagecreatetruecolor($this->width, $this->height); $bgColor = imagecolorallocate($this->im, 0, 0, 0); imagefill($this->im, 0, 0, $bgColor); } private function setDisturb() { $area = ($this->width * $this->height) / 20; $disturbNum = ($area > 250) ? 250 : $area; //加入点干扰 for ($i = 0; $i < $disturbNum; $i++) { $color = imagecolorallocate($this->im, rand(0, 255), rand(0, 255), rand(0, 255)); imagesetpixel($this->im, rand(1, $this->width - 2), rand(1, $this->height - 2), $color); } //加入弧线 for ($i = 0; $i <= 5; $i++) { $color = imagecolorallocate($this->im, rand(128, 255), rand(125, 255), rand(100, 255)); imagearc($this->im, rand(0, $this->width), rand(0, $this->height), rand(30, 300), rand(20, 200), 50, 30, $color); } } private function createCode() { $str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ"; for ($i = 0; $i < $this->codeNum; $i++) { $this->code .= $str{rand(0, strlen($str) - 1)}; } } private function setCaptcha() { $this->createCode(); for ($i = 0; $i < $this->codeNum; $i++) { $color = imagecolorallocate($this->im, rand(50, 250), rand(100, 250), rand(128, 250)); $size = rand(floor($this->height / 5), floor($this->height / 3)); $x = floor($this->width / $this->codeNum) * $i + 5; $y = rand(0, $this->height - 20); imagechar($this->im, $size, $x, $y, $this->code{$i}, $color); } } private function outputImg() { if (imagetypes() & IMG_JPG) { header('Content-type:image/jpeg'); imagejpeg($this->im); } elseif (imagetypes() & IMG_GIF) { header('Content-type: image/gif'); imagegif($this->im); } elseif (imagetype() & IMG_PNG) { header('Content-type: image/png'); imagepng($this->im); } else { die("Don't support image type!"); } } } // 这样调用 新建文件 <?php require_once 'captcha.class.php'; $captcha = new Captcha(80,30,4); $captcha->showImg();
路过2017-11-07 08:14:54
Siarkan mesej ralat Siapa yang mempunyai masa untuk membaca kod anda? ? ?