php股票K线图生成代码

此程序实现php画柱状图它的设计思想是：首先以用imagecreate（）来生成一个空白图形；其程序实现如下： //需要两种不同的颜色，正数一个 负数一个 ，一个数据数组,$path为保存图片的地址

<?php教程
//此程序实现php画柱状图,开发股票网站的朋友经常会碰到在生成k线图片，现在我们来看看一款利用php根据数组数据生成k线图片。
//它的设计思想是：首先以用imagecreate（）来生成一个空白图形；其程序实现如下：
//需要两种不同的颜色，正数一个 负数一个 ，一个数据数组,$path为保存图片的地址

$data = array ("-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24","-1174.58","-1865.41","1961.24");
$colors = array (array (255,0,0 ),array (0,255,0 ) );
$path = "gg15_600050.gif";
$title = "中国联通(600050)30日资金进出";
$date = array ("2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00","2010-05-20 00:00:00");
$hai = array(7203,6037,1931,9605,7405,8855,228,7771,8671,8791,1290,426,3265,4298,4809,3350,8204,8682,5523,7569,5853,593,3124,9062,3329,3236,2252,8756,2796,5164,2599,2630,1470,9779,8805,1512,1517,5635,760,1380,152,6035,2905,3163,9443,9432,5031,2838,6802,9330,1878,1333,4297,4180,3037,4527,9043,7287,3248,3448,3405,7204,2203,3974,4399,7333,4541,7033,4292,6128,9955,8603,297,6992,3282,9612,4483,8379,4016,6038,4163,3789,6896,8710,1502,1579,1712,3705,3619,5150,3007,1853,2776,3056,569,9031,6092,8600,8941,6366,5829,433,8011,9637,9106,1761,2422,9873,8186,1136,1763,3050,285,1962,775,9900,7371,2691,9051,6596,6858,6726,1527,3970,910,2621,7598,7899,6546,3678,2202,9411,6129,8352,4830,4484,6776,243,323,3946,751,7508,8173,3776,5071,3847,3318,4901,2102,7516,5251,3299,8859,2114,8711,9800,7707,5898,3489,580,5763,2470,4126,6269,5191,182,412,3043,3208,2438,6889,1732,1979,7692,3445,8214,8620,9446,4624,3615,5496,6152,213,3715,9623,1215,4757,9443,3366,2988,8043,6874,3742,4974,4812,6839,3016,5625,4656,5315,8303,8346,2315,3230,1969,1688,7381,6463,1030,8856,4691,6042,7652,8502,3839,7844,9149,4029,9465,2897,7688,3791,1458,6981,484,1290,4261,1222,9503,4881,7663,1399,2260,8066,6405,8442,722,9297,177,8426,2103,2078,3521,2280,8570,4663,6227,5784,7438,654,3036,9965,872,8306,3537,899,5888,1319,2472,9218,4853,7849,9433,1196,4880,1597,9258,7465,8138,817,1637,4201,1939,8914,1114,2232,8251,4538,7378,7438,4489,993,5269,944,2718,6633,4378,8431,155,5061,9347,1125,8865,4629,9965,4706,6263,8742,971,301);
draw(600,300,$data,$colors,$path,$title,$date);
function draw($w,$h,$data,$colors,$path,$title,$date)
{
 //创建新空白图形
 //箭头50像素，内容400*300
 $width = $w;
 $height = $h;
 //取得左下角的坐标点，左边50像素和最下边50像素用于写标尺
 $l_b_x = 50;
 $l_b_y = $height/2;
 
 $chartfont = 2; //图表字体
 $font = 'c:/windows/fonts/simsun.ttc';//支持汉字的字体
 $chartfontheight = imagefontheight($chartfont);//图表字体的大小
 
 //取得最大的数据
 $max = abs(max($data));
 $max = $max>abs(min($data))?$max:abs(min($data));
 $image = imagecreate($width,$height);
 
 //填充背景为白色
 $color_white = imagecolorallocate($image, 0xff, 0xff, 0xff);//白色
 $color_diwen = imagecolorallocate($image,0xd8,0xd8,0xd8);//暗灰色
 imagefill($image,0,0,$color_white);
 //写入logo
 imagettftext($image,20,0,$l_b_x+20,45,$color_diwen,$font,'华南财经网');
 //画坐标
 //坐标颜色为黑色,先画坐标，再画箭头
 $black_color = imagecolorallocate($image,0x00,0x00,0x00);
 imageline($image,$l_b_x,$l_b_y,$l_b_x,10,$black_color);
 imageline($image,$l_b_x,$l_b_y,$width-10,$l_b_y,$black_color);
 //箭头
 imageline($image,$l_b_x,10,$l_b_x-3,14,$black_color);
 imageline($image,$l_b_x,10,$l_b_x+3,14,$black_color);
 imageline($image,$width-10,$l_b_y,$width-13,$l_b_y-3,$black_color);
 imageline($image,$width-10,$l_b_y,$width-13,$l_b_y+3,$black_color);
 //画底纹,灰色;画20条底纹；虚线
 $pit = floor(($l_b_y-50)/10);//每一段的高度
 $pit_x = floor(($width-$l_b_x-30)/count($data));//每一段的宽度
 //计算单位
 $x_max = $max;
 $flag_danwei = 0;
 while($x_max> 1000 )
 {
  $x_max /= 100;
  $flag_danwei++;
 }
 switch($flag_danwei)
 {
 // case 0:$danwei = '（元）';break;
  case 0:$danwei = '（万）';break;
  case 1:$danwei = '（百万）';break;
  case 2:$danwei = '（亿）';break;
  case 3:$danwei = '（百亿）';break;
 }
 for($i=1;$i<11;$i++)
 {
  imageline($image,$l_b_x+1,$l_b_y-$i*$pit,$width-15,$l_b_y-$i*$pit,$color_diwen);
  //从坐标的值
  $v_v = number_format(($max/(10*pow(100,$flag_danwei))*$i),2);
  $v_v = substr($v_v,0,5);
  imagestring($image,
     $chartfont,
     $l_b_x-40,
     $l_b_y-$i*$pit-10,
     $v_v,
     $black_color);
 }
 //原点坐标
 imagestring($image,
    $chartfont,
    $l_b_x-20,
    $l_b_y-10,
    0,
    $black_color);
 //写入汉字,单位 和标题
 imagettftext($image, 10,0,$l_b_x-45,20,$black_color,$font,$danwei);
 //imagettftext($image, 11,0,$width/2-70,$l_b_y+20,$black_color, $font,$title);

 //画柱体，长方形，并着色
 $color_big = imagecolorallocate($image,$colors[0][0],$colors[0][1],$colors[0][2]);
 $color_small = imagecolorallocate($image,$colors[1][0],$colors[1][1],$colors[1][2]);
 for($j=0;$j<count($data);$j++)
 {
  $d_h = floor(abs($data[$j]/$max*10*$pit));//柱体高度
  $current_date = substr($date[$j],5,5);
 // $current_date .= substr($date[$j],8,2);
  imagerectangle($image,
     $l_b_x+$j*$pit_x+1,
     $l_b_y,
     $l_b_x+($j+1)*$pit_x-2,
     $l_b_y-$d_h,
     $black_color);
  //为矩形着色
  $current_color = $data[$j]>0?$color_big:$color_small;
  imagefilltoborder($image,
    $l_b_x+$j*$pit_x+1 + floor($pit_x/2),
    $l_b_y-floor($d_h/2),
    $black_color,
    $current_color);
  //写入日期
  /*imagestring($image,
    $chartfont,
    $l_b_x+$j*$pit_x,
    $l_b_y+2,
    $current_date,
    $black_color);*/
  imagettftext($image,8,90,$l_b_x+$j*$pit_x+10,$l_b_y-$d_h,$black_color,$font,$current_date);
 } 
 if($path !="")
  imagegif($image,$path);
 else imagegif($image);
 imagedestroy($image);
 }//画图函数结束
//输出生成的图片
/*

header("content-type: image/gif");
$my_colors[] = array(0xff,0x00,0x00);
$my_colors[] = array(0x00,0xff,0x00);
draw(600,400,array(1066565650,-40345340,50343433440,1834340,50343230,-8023454230,600,7232323300,-836),$my_colors,0,'教科书大阿斯顿即可');*/
//draw(600,400,array(1066,-4040,5040,1840,5030,-8230,600,7232,-836),$my_colors,0,'教科书大阿斯顿即可');
?>

本站原创教程，转载注明来源于http://www.111cn.net/phper/php.html 否则必究

这里有两款验证码生成程序，第一款比较好，第二款也不错，同时第二款生成程序用一个完完的实例来说明验证码调用与生成

session_start();
class authnum {
 //图片对象、宽度、高度、验证码长度
 private $im;
 private $im_width;
 private $im_height;
 private $len;
 //随机字符串、y轴坐标值、随机颜色
 private $randnum;
 private $y;
 private $randcolor;
 //背景色的红绿蓝，默认是浅灰色
 public $red=238;
 public $green=238;
 public $blue=238;
 /**
  * 可选设置：验证码类型、干扰点、干扰线、y轴随机
  * 设为 false 表示不启用
 **/
 //默认是大小写数字混合型，1 2 3 分别表示 小写、大写、数字型
 public $ext_num_type='';
 public $ext_pixel = false; //干扰点
 public $ext_line  = false; //干扰线
 public $ext_rand_y= true;  //y轴随机
 function __construct ($len=4,$im_width='',$im_height=25) {
  // 验证码长度、图片宽度、高度是实例化类时必需的数据
  $this->len      = $len; $im_width = $len * 15;
  $this->im_width = $im_width;
  $this->im_height= $im_height;
  $this->im = imagecreate($im_width,$im_height);
 }
 // 设置图片背景颜色，默认是浅灰色背景
 function set_bgcolor () {
  imagecolorallocate($this->im,$this->red,$this->green,$this->blue);
 }
 // 获得任意位数的随机码
 function get_randnum () {
  $an1 = 'abcdefghijklmnopqrstuvwxyz';
  $an2 = 'abcdefghijklmnopqrstuvwxyz';
  $an3 = '0123456789';
  if ($this->ext_num_type == '')  $str = $an1.$an2.$an3;
  if ($this->ext_num_type == 1) $str = $an1;
  if ($this->ext_num_type == 2) $str = $an2;
  if ($this->ext_num_type == 3) $str = $an3;
  for ($i = 0; $i < $this->len; $i++) {
   $start = rand(1,strlen($str) - 1);
   $randnum .= substr($str,$start,1);
  }
  $this->randnum = $randnum;
  $_session[an] = $this->randnum;
 }
 // 获得验证码图片y轴
 function get_y () {
  if ($this->ext_rand_y) $this->y = rand(5, $this->im_height/5);
  else $this->y = $this->im_height / 4 ;
 }
 // 获得随机色
 function get_randcolor () {
  $this->randcolor = imagecolorallocate($this->im,rand(0,100),rand(0,150),rand(0,200));
 }
 // 添加干扰点
 function set_ext_pixel () {
  if ($this->ext_pixel) {
   for($i = 0; $i < 100; $i++){
       $this->get_randcolor();
       imagesetpixel($this->im, rand()%100, rand()%100, $this->randcolor);
   }
  }
 }
 // 添加干扰线
 function set_ext_line () {
  if ($this->ext_line) {
   for($j = 0; $j < 2; $j++){
    $rand_x = rand(2, $this->im_width);
    $rand_y = rand(2, $this->im_height);
    $rand_x2 = rand(2, $this->im_width);
    $rand_y2 = rand(2, $this->im_height);
    $this->get_randcolor();
    imageline($this->im, $rand_x, $rand_y, $rand_x2, $rand_y2, $this->randcolor);
   }
  }
 }
 /**创建验证码图像：
  * 建立画布（__construct函数）
  * 设置画布背景（$this->set_bgcolor();）
  * 获取随机字符串（$this->get_randnum ();）
  * 文字写到图片上（imagestring函数）
  * 添加干扰点/线（$this->set_ext_line(); $this->set_ext_pixel();）
  * 输出图片
 **/
 function create () {
  $this->set_bgcolor();
  $this->get_randnum ();
  for($i = 0; $i < $this->len; $i++){
   $font = rand(4,6);
      $x    = $i/$this->len * $this->im_width + rand(1, $this->len);
   $this->get_y();
   $this->get_randcolor();
      imagestring($this->im, $font, $x, $this->y, substr($this->randnum, $i ,1), $this->randcolor);
  }
      $this->set_ext_line();
      $this->set_ext_pixel();
   header("content-type:image/png");
   imagepng($this->im);
   imagedestroy($this->im);     //释放图像资源
 }

}//end class
/**使用验证码类的方法：
 * $an = new authnum(验证码长度,图片宽度,图片高度);
 * 实例化时不带参数则默认是四位的60*25尺寸的常规验证码图片
 * 表单页面检测验证码的方法，对比 $_session[an] 是否等于 $_post[验证码文本框id]
 * 可选配置：
 *  1.验证码类型：$an->ext_num_type=1;  值为1是小写类型，2是大写类型，3是数字类型
 *  2.干扰点：$an->ext_pixel = false;   值为false表示不添加干扰点
 *  3.干扰线：$an->ext_line = false;    值为false表示不添加干扰线
 *  4.y轴随机：$an->ext_rand_y = false; 值为false表示不支持图片y轴随机
 *  5.图片背景：改变 $red $green $blue 三个成员变量的值即可
**/
$an = new authnum();
$an->ext_num_type='';
$an->ext_pixel = true; //干扰点
$an->ext_line  = false; //干扰线
$an->ext_rand_y= true; //y轴随机
$an->green = 238;
$an->create();
?>

好下面来看一款验证码调用实例

例子demo:

以下为引用的内容：
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>hi.baidu.com/ji_haiyang</title>
</head>

<body>
<form action ="demo1.php教程" method="post" name="form1">
<input name ="test" type="text" value="1234" />
<div onclick='this.innerhtml="<img src=vcode.php?r="+math.random()+"></img>"'>
<img src="vcode.php"></img>
</div>
<input name ="test2" type="text" value="1" />
<input name ="submit" type="submit" value="submit" />
</form>

</body>
</html>

 

例子demo1:

<?php

session_start();
$test = $_post['test'];
$test = trim($test);
$submit = $_post['submit'];
if($test==$_session['vcode']){
echo 'true,输入验证码正确';
} else {
echo 'false，输入验证码错误';
}

?>
 

调用文件vcode.php: 以下为引用的内容：
<?php
/**
* 默认验证码session为vcode.即:$_session['vcode'];
* 注意在给变量符值时不要把变量的名子和session冲突
* 注:在验证时不分大小写
*/
include("inc_vcode_class.php");
$v = new vcode;
//$config['width'] = 50;   //验证码宽
//$config['height'] = 20;   //验证码高
//$config['vcode'] = "vcode"; //检查验证码时用的session
//$config['type'] = "default"; //验证码展示的类型default:大写字母,string:小写字母,int:数字 php程序员站
//$config['length'] = 4;   //验证码长度
//$config['interfere']= 10;   //干扰线强度,范围为1-30,0或空为不起用干扰线
//$v->init($config); //配置
$v->create();
?>

验证码类inc_vcode_class.php: www~phperz~com 以下为引用的内容：
<?php
/**
* 验证码类
* 注:需要gd库支持
*/
session_start();
class vcode{
private $config;
private $im;
private $str;

function __construct(){
$this->config['width'] = 50;
$this->config['height'] = 20;
$this->config['vcode'] = "vcode";
$this->config['type'] = "default";
$this->config['length'] = 4;
$this->config['interfere'] = 10;

$this->str['default'] = "abcdefghijklmnopqrstuvwxyz";
$this->str['string'] = "abcdefghijklmnopqrstuvwxyz";
$this->str['int']  = "0123456789";
}

//配置
public function init($config=array()){
if (!empty($config) && is_array($config)){
foreach($config as $key=>$value){
$this->config[$key] = $value;
}
}
}

//输出验证码
public function create(){
if (!function_exists("imagecreate")){
return false;
}
$this->create_do();
}

//创建
private function create_do(){
$this->im = imagecreate($this->config['width'],$this->config['height']); php程序员之家
//设置背景为白色
imagecolorallocate($this->im, 255, 255, 255);

//为此背景加个边框
$bordercolor= imagecolorallocate($this->im,37,37,37);
imagerectangle($this->im,0,0,$this->config['width']-1,$this->config['height']-1,$bordercolor);

//生成验证码
$this->create_str();
$vcode = $_session[$this->config['vcode']];

//输入文字
$fontcolor = imagecolorallocate($this->im,46,46,46);
for($i=0;$i<$this->config['length'];$i++){
imagestring($this->im,5,$i*10+6,rand(2,5),$vcode[$i],$fontcolor);
}

//加入干扰线
$interfere = $this->config['interfere'];
$interfere = $interfere>30?"30":$interfere; php程序员站
if (!empty($interfere) && $interfere>1){
for($i=1;$i<$interfere;$i++){
$linecolor = imagecolorallocate($this->im,rand(0,255),rand(0,255),rand(0,255));
$x = rand(1,$this->config['width']);
$y = rand(1,$this->config['height']);
$x2 = rand($x-10,$x+10);
$y2 = rand($y-10,$y+10);
imageline($this->im,$x,$y,$x2,$y2,$linecolor);
}
}

header("pragma:no-cachern");
header("cache-control:no-cachern");
header("expires:0rn");
header("content-type:image/jpegrn");
imagejpeg($this->im);
imagedestroy($this->im);
exit;
}

//得到验证码
private function create_str(){
if ($this->config['type']=="int"){
for($i=1;$i<=$this->config['length'];$i++){
$vcode .= rand(0,9);
}
$_session[$this->config['vcode']] = $vcode;
return true;
}
$len = strlen($this->str[$this->config['type']]);
if (!$len){
$this->config['type'] = "default";
$this->create_str();
}
for($i=1;$i<=$this->config['length'];$i++){
$offset  = rand(0,$len-1);
$vcode .= substr($this->str[$this->config['type']],$offset,1);
}
$_session[$this->config['vcode']] = $vcode;
return true;
}
}

$ico_pic 是你要给图片加水印的水印图片，其它的参数都有详细的说明，如果你下大找这类代码可以下载保存成php文件再利用后面说的调用方法来调用本生成水印图片类代码。

 class smallpic{

  private $src_pic;//原图
  private $ico_pic = "003.png";//水印图
  private $ico_text = "水印";//水印文字
  private $small_width;//缩略图宽度
  private $small_height;//缩略图高度
  private $is_ico_pic = true;//是否加图片水印
  private $is_text = true;//是否加文字水印
  private $src_x = 20;//水印在原图的x坐标
  private $src_y = 20;//水印在原图的y坐标
  private $ut = "utf-8";//文字编码
  private $font_color = "#990000";//文字水印颜色
  private $samll_pic_name = "smallpic";//小图的名称
  private $big_pic_name = "bigpic";//大图的名称

  function __construct($src_pic,$small_width,$small_height){
   $this->checkfile($src_pic);
   $this->checkfile($this->ico_pic);
  $this->src_pic = $src_pic;
  $this->small_width = $small_width;
  $this->small_height = $small_height;
  }

 private function __get($property_name){
  return $this->$property_name;
 }

 private function __set($property_name,$value){
  return $this->$property_name = $value;
 }

 /**
  * 取得图片的一些基本信息，类型为array
  */
  function getimageinfo($image){
  return @getimagesize($image);
  }

 /**
  * 把图片加载到php中
  * $image 传进来的图片
  */
  function getimage($image){
  $image_info = $this->getimageinfo($image);
  switch($image_info[2]){
   case 1:
    $img = @imagecreatefromgif($image);
    break;
   case 2:
    $img = @imagecreatefromjpeg($image);
    break;
   case 3:
    $img = @imagecreatefrompng($image);
    break;
  }
  return $img;
  }

 function createimageforsuffix($big_pic,$new_pic){
  $image_info = $this->getimageinfo($this->src_pic);
  switch($image_info[2]){
   case 1:
    //输出大图
    @imagegif($big_pic,$this->big_pic_name.".gif");
    //输出小图
    @imagegif($new_pic,$this->samll_pic_name.".gif");
    break;
   case 2:
    //输出大图
    @imagejpeg($big_pic,$this->big_pic_name.".jpg");
    //输出小图
    @imagejpeg($new_pic,$this->samll_pic_name.".jpg");
    break;
   case 3:
    //输出大图
    @imagepng($big_pic,$this->big_pic_name.".png");
    //输出小图
    @imagepng($new_pic,$this->samll_pic_name.".png");
    break;
  }
 }

 function checkfile($file){
  if(!file_exists($file)){
   die("图片:".$file."不存在！");
  }
 }

 function createsmallimage(){
  $big_pic = $this->getimage($this->src_pic);
  $big_pic_info = $this->getimageinfo($this->src_pic);
  $new_pic = $this->getimage($this->ico_pic);
  $new_pic_info = $this->getimageinfo($this->ico_pic);
  $rgb = $this->convcolor();

  //判断是按宽比例缩放还是按高比例缩放
  if($big_pic_info[0] > $big_pic_info[1]){
   $ratio = $this->small_width/(int)$big_pic_info[0];
   $small_pic_width = $this->small_width;
   $small_pic_height = (int)($big_pic_info[1]*$ratio);
  }else{
   $ratio = $this->small_height/(int)$big_pic_info[1];
   $small_pic_height = $this->small_height;
   $small_pic_width = (int)($big_pic_info[0]*$ratio);
  }

  //echo $small_pic_width = (int)($big_pic_info[0]*$ratio);
  //echo $small_pic_height = (int)($big_pic_info[1]*$ratio);

  //是否打图片水印
  if ($this->is_ico_pic){
   //打图片水印
   @imagecopy($big_pic,$new_pic,$this->src_x,$this->src_y,0,0,$new_pic_info[0],$new_pic_info[1]);
  }
  //是否打文字水印
  if ($this->is_text){
   //设置文字颜色
   $text_color = @imagecolorallocate($big_pic,$rgb[0],$rgb[1],$rgb[2]);
   //转换文字编码
   $text = @iconv($this->ut,"utf-8",$this->ico_text);
   //打文字水印
   @imagettftext($big_pic,12,0,$this->src_x,$this->src_y,$text_color,"simkai_0.ttf",$text);
  }
  //新建一个新图片的画板
  $new_pic = @imagecreatetruecolor($small_pic_width,$small_pic_height);
  //生成缩略图
  @imagecopyresized($new_pic,$big_pic,0,0,0,0,$small_pic_width,$small_pic_height,$big_pic_info[0],$big_pic_info[1]);
  //输出图
  $this->createimageforsuffix($big_pic,$new_pic);
 }

 /**
  * 类内部的功能函数把#000000转换成255,255,255
  */
 private function convcolor(){
  $rgb = array();
  $color = preg_replace("/#/","",$this->font_color);
  $c = hexdec($color);
  $r = ($c >> 16) & 0xff;
  $g = ($c >> 8) & 0xff;
  $b = $c & 0xff;
  $rgb[0] = $r;
  $rgb[1] = $g;
  $rgb[2] = $b;
  return $rgb;
 }
 }

//调用方法
 

$pic = new smallpic("002.jpg",600,300);
 $pic->is_text = true;
 $pic->is_ico_pic = true;
 $pic->ico_pic = "./images/004.png";
 $pic->ico_text = "新年快乐!";
 //$pic->src_x = 80;
 $pic->src_y = 80;
 $pic->ut = "utf-8";
 $pic->font_color = "#0521f8";
 $pic->samll_pic_name = "hslsamll";
 $pic->big_pic_name = "hslbig";
 $pic->createsmallimage();

?>

一款php生成验证码实现代码，把自定义了session的目录，这样就不是php.ini里默认的session文件保存路径了，如下面session_save_path,可重新定义目录。

session_save_path,可重新定义目录。
*/
$sesssavepath = dirname(__file__)."/../data/sessions/";
if(is_writeable($sesssavepath) && is_readable($sesssavepath)){ session_save_path($sesssavepath); }
session_start();
$vstr = '';
for($i=0; $i<4; $i++) $vstr .= chr(mt_rand(65,90));
if(function_exists("imagecreate")){
 $ntime = time();
 if(empty($_session['verifycode_last']) || empty($_session['verifycode']) || ($ntime - $_session['verifycode_last'] > 5)){
  $_session['verifycode'] = strtolower($vstr);
  $_session['verifycode_last'] = $ntime;
 }
 $vstr = $_session['verifycode'];
 $vstrlen = strlen($vstr);
 $img = imagecreate(50,20);
 imagecolorallocate($img, 255,255,255);
 $line1 = imagecolorallocate($img,240,220,180);
 $line2 = imagecolorallocate($img,250,250,170);
 for($j=3;$j<=16;$j=$j+3){
  imageline($img,2,$j,48,$j,$line1);
 }
 for($j=2;$j<52;$j=$j+(mt_rand(3,6))){
  imageline($img,$j,2,$j-6,18,$line2);
 }
 $bordercolor = imagecolorallocate($img, 0x99,0x99,0x99);
 imagerectangle($img, 0, 0, 49, 19, $bordercolor);
 $fontcolor = imagecolorallocate($img, 48,61,50);
 for($i=0;$i<$vstrlen;$i++){
  $bc = mt_rand(0,1);
  $vstr[$i] = strtoupper($vstr[$i]);
  imagestring($img, 5, $i*10+6, mt_rand(2,4), $vstr[$i], $fontcolor);
 }

 header("pragma:no-cachern");
 header("cache-control:no-cachern");
 header("expires:0rn");

 if(function_exists("imagejpeg")){
  header("content-type:image/jpegrn");
  imagejpeg($img);
 }else{
  header("content-type:image/pngrn");
  imagepng($img);
 }
 imagedestroy($img);
 exit();
}

1.用imagecreatetruecolor和imagecopyresampled函数分别取代imagecreate和imagecopyresized
2.给imagejpeg的第三个参数带上100(例:imagejpeg($ni,$tofile,100))

imagecreatetruecolor -- 新建一个真彩色图像
说明
resource imagecreatetruecolor ( int x_size, int y_size )
imagecreatetruecolor() 返回一个图像标识符，代表了一幅大小为 x_size 和 y_size 的黑色图像

*/

header ("content-type: image/png");
$im = @imagecreatetruecolor (50, 100)
     or die ("cannot initialize new gd image stream");
$text_color = imagecolorallocate ($im, 233, 14, 91);
imagestring ($im, 1, 5, 5,  "a simple text string", $text_color);
imagepng ($im);
imagedestroy ($im);

/*

如果使用普通的imagecreate()函数将造成图片质量失真的情况，从网上搜了一下解决办法，方法是用imagecreateruecolor()函数替换imagecreate()函数。
*/

function createpreview($img,$name,$path,$maxwidth,$maxheight,$quality){//图片,保存名称,保存路径,最大宽,最大高,质量
 $widthratio=0;
 $heightratio=0;
 $width=imagesx($img);
 $height=imagesy($img);
 //开始计算缩小比例
 if($width>$maxwidth||$height>$maxheight){
  if($width>$maxwidth){
   $widthratio=$maxwidth/$width;
  }
  if($height>$maxheight){
   $heightratio=$maxheight/$height;
  }
  if($widthratio>0&&$heightratio>0){
   if($widthratio<$heightratio){
    $ratio=$widthratio;
   }else{
    $ratio=$heightratio;
   }
  }elseif($widthratio>0){
   $ratio=$widthratio;
  }elseif($heightratio>0){
   $ratio=$heightratio;
  }
  //根据得出的比例,重新计算缩略图的宽和高
  $newwidth=$ratio*$width;
  $newheight=$ratio*$height;
  $newimg=imagecreatetruecolor($newwidth,$newheight); // 创建目标图
  imagecopyresized($newimg,$img,0,0,0,0,$newwidth,$newheight,$width,$height);
  imagejpeg($newimg,$path."s_".$name,$quality);
  imagedestroy($newimg);
 }else{
  imagejpeg($img,$path."s_".$name,$quality);
 }
}
/*

imagecopyresamples() ,其像素插值算法得到的图像边缘比较平滑.质量较好(但该函数的速度比 imagecopyresized() 慢).