如何将code.class.php文件进行优化改写以提升性能？

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phpclass CodeGenerator { private $width; private $height;

public function __construct($width, $height) { $this->width=$width; $this->height=$height; $this->image=imagecreatetruecolor($this->width, $this->height); $this->bgColor=imagecolorallocate($this->image, 255, 255, 255); imagefill($this->image, 0, 0, $this->bgColor); }}

code.class.php

image = imagecreatetruecolor($this->width,$this->height); $bgColor = imagecolorallocate($this->image,255,255,255); imagefill($this->image,0,0,$bgColor); } /** * 生成验证码字符 */ private function createCode() { for ($i=0;$i<$this->codeLeng;$i++) { $fontContent = $this->codeString[rand(0, 35)]; $this->code .= $fontContent; $fontColor = imagecolorallocate($this->image, rand(0, 120), rand(0, 120), rand(0, 120)); $x = ($i * $this->width / $this->codeLeng) + rand(10, 10); $y = rand(10, 10); imagestring($this->image, $this->fontSize, $x, $y, $fontContent, $fontColor); } $_SESSION['code'] = $this->code; } /** * 添加圆点干扰项 */ private function setPixel() { for ($i=0;$i<200;$i++) { $pixelColor = imagecolorallocate($this->image,rand(100,200),rand(100,200),rand(100,200)); imagesetpixel($this->image,rand(0,$this->width-1),rand(1,$this->height-1),$pixelColor); } } /** * 线性干扰 */ private function setLine() { for ($i=0;$i<20;$i++) { $linelColor = imagecolorallocate($this->image,rand(100,200),rand(100,200),rand(100,200)); imageline($this->image,rand(0,$this->width-1),rand(1,$this->height-1),rand(0,$this->width-1),rand(1,$this->height-1),$linelColor); } } /** * 输出验证码 * */ private function outPut() { header('content-type: image/png'); imagepng($this->image); $this->destroyImage(); } /** * 显示验证码 */ public function showCode() { $this->createImage(); $this->setPixel(); $this->setLine(); $this->createCode(); $this->outPut(); } /** * 销毁图片资源 */ private function destroyImage() { imagedestroy($this->image); } }