File Upload Function in PHP
Published:
实现图形验证码
预设变量
$number验证码个数$codeType验证码类型0纯数字1纯字母2数字字母混合
$width验证码宽度$height验证码高度$code验证码$image图像资源
实现步骤
- 生成验证码
- 创建画布
- 填充背景色
- 验证码画到画布上
- 添加干扰元素
- 输出显示
// Init attribute of class member
// Generate $code content randomly
public function __construct($number,$codeType,$width,$height)
// Magic method to code getter
public function __get($name)
protected function createCode()
// 0: getNumberCode()
// 1: getCharCode()
// 2: getNumCharCode()
protected function getNumberCode()
$str=join('',range(0,9))
return substr(str_shuffle($str),0,$this->number);
protected function getCharCode()
$str=join('',range('a','z'));
$str=$str.strtoupper($str);
return substr(str_shuffle($str),0,$this->number);
protected function getNumCharCode()
public function outImage()
$this->createImage();
$this->fillBack()
protected function createImage()
$this->image=imagecreatetruecolor($this->width,$this->height);
protected function fillBack()
imagefill()
imagecolorallocate()
mt_rand()
protected function drawChar()
$x=mt_rand($i*$width+5,($i+1)*width-10);
$y=mt_rand(0,$this->height-15);
imagechar($this->image,5,$x,$y,$this->code[$i],$this->darkColor());
protected function drawDistrub()
imagesetpixel($this->image,$x,$y,$this->lightColor());
protected function show()
header('Content-Type:image/png');
imagepng($this->image);
public function _destruct()
imagedestory($this->image)