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PHP第十课 PHP图像处理函数以及验证码实现

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Release： 2016-06-06 19:55:14
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如果你喜欢本博客,请访问本博客地址:http://blog.csdn.net/junzaivip 概要: gd库画图: 数学函数 PHP图片处理函数 图片处理函数使用场景 1.验证码 2.缩放 3.裁剪 4.水印 gd库画图: 1.准备画布 2.准备涂料 3.画画 4.输出图片 5.保存图片 6.关闭画布 ?php //准

如果你喜欢本博客,请访问本博客地址:http://blog.csdn.net/junzaivip


概要:

gd库画图:

数学函数

PHP图片处理函数

图片处理函数使用场景

1.验证码
2.缩放
3.裁剪
4.水印




gd库画图:


1.准备画布
2.准备涂料
3.画画
4.输出图片
5.保存图片
6.关闭画布


<?php //准备画布

	$im = imagecreatetruecolor(500, 300);

	//准备涂料
	$black = imagecolorallocate($im, 0, 0, 0);

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

	//背景填充成黑色
	imagefill($im,0,0, $black);

	//画一个矩形,填充成白色
	imagefilledellipse($im, 258, 151, 200, 200, $white);
	//输出到浏览器或保存起来
	header("content-type:image/png");
	//输出图片
	imagepng($im);

	//关闭画布
	imagedestroy($im);
?>
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PHP图片处理函数
1.数学函数
2.图片处理函数




数学函数:
1.max();
2.min();
3.mt_rand();随机取一个数字 
<?php echo	mt_rand(1,5);
?>
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mt_rand随机取一个值 
<?php //随机从一个数组中取一个值
$arr = array("a","b","c","d","e");

$rkey = mt_rand(0,count($arr)-1);

echo $arr[$rkey];
?>
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4.ceil();天花板 
5.floor();
6.round();四舍五入 
<?php echo ceil(2.4);//3
	echo floor(2.4);//2
	echo round(2.4);//2
	echo round(2.6);//3

?>
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6.pi(); //π 取圆周率

<?php &#160;
echo(pi());


echo M_PI;
?>
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图片处理函数使用场景

1.验证码
2.缩放
3.裁剪
4.水印

PHP中穿件图像的五个步骤
1.准备画布
2.准备涂料
3.在画布上画图像或者文字
4.输出最终图像或曹村最终图像
5.释放画布资源

<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);

//3.在画布上画图像或者文字
//如果不填充背景,默认是黑色
imageellipse($im,258,151,200,200,$white);


//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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绘制图像:
imagefill();
imagesetpixel();//画像素点
imageline();//画线
imagerectangle();//画一个矩形
imagepolygon();//画一个多边形
imageellipse();//画一个椭圆
imageare();画一个圆弧
imagechar();//水平的画一个字符
imagestring();//水平的画一行字符串


//画线
<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);

//3.在画布上画图像或者文字
//如果不填充背景,默认是黑色
imageline($im,0,0,500,300,$white);
imageline($im,0,300,500,0,$white);
imageline($im,0,150,500,150,$white);
imageline($im,250,0,250,300,$white);


//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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//添加干扰素
<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);

//3.在画布上画图像或者文字
//产生随机的点
for ($i=0; $i < 1000; $i++) { 

imagesetpixel($im,mt_rand(0,500),mt_rand(0,300),$white);

}
//产生随机的线

for ($j=0; $j < 100; $j++) { 
	imageline($im, mt_rand(0,500), mt_rand(0,300), mt_rand(0,500), mt_rand(0,300), $white);
}//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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//画矩形:
<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);


//3.在画布上画图像或者文字
imagerectangle($im, 20, 20, 480, 280, $white);//
imagefilledrectangle($im, 20, 20, 480, 280, $white);//填充






//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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//imagepolygon 画多边形_画三角形
<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);

//3.在画布上画图像或者文字
$arr = array(
	250,20,
	60,240,
	440,240
	);
imagepolygon($im, $arr, 3, $white);


//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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画一个3D饼状图
<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$red = imagecolorallocate($im, 255, 0, 0);
$grayred = imagecolorallocate($im, 255, 100, 100);
$green = imagecolorallocate($im, 0, 255, 0);
$blue = imagecolorallocate($im, 0, 0, 255);
$gray = imagecolorallocate($im, 200, 200, 200);
$white = imagecolorallocate($im, 255, 255, 255);

//3.在画布上画图像或者文字
for ($i=0; $i < 10; $i++) { 
	imagefilledarc($im, 250, 150+$i, 200, 200, 0, 70, $gray,IMG_ARC_PIE);
	imagefilledarc($im, 250, 150+$i, 200, 200, 70, 190, $grayred,IMG_ARC_PIE);
	imagefilledarc($im, 250, 150+$i, 200, 200, 190, 270, $green,IMG_ARC_PIE);
	imagefilledarc($im, 250, 150+$i, 200, 200, 270, 360, $blue,IMG_ARC_PIE);

}
	imagefilledarc($im, 250, 150, 200, 200, 0, 70, $white,IMG_ARC_PIE);
	imagefilledarc($im, 250, 150, 200, 200, 70, 190, $red,IMG_ARC_PIE);
	imagefilledarc($im, 250, 150, 200, 200, 190, 270, $green,IMG_ARC_PIE);
	imagefilledarc($im, 250, 150, 200, 200, 270, 360, $blue,IMG_ARC_PIE);

//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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//写文字:
<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$red = imagecolorallocate($im, 255, 0, 0);
$grayred = imagecolorallocate($im, 255, 100, 100);
$green = imagecolorallocate($im, 0, 255, 0);
$blue = imagecolorallocate($im, 0, 0, 255);
$gray = imagecolorallocate($im, 200, 200, 200);
$white = imagecolorallocate($im, 255, 255, 255);

//3.在画布上画图像或者文字

$str= "PHP is very much";

imagestring($im, 5, 260, 160, $str, $green);
//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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//写单个字符:
<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$red = imagecolorallocate($im, 255, 0, 0);
$grayred = imagecolorallocate($im, 255, 100, 100);
$green = imagecolorallocate($im, 0, 255, 0);
$blue = imagecolorallocate($im, 0, 0, 255);
$gray = imagecolorallocate($im, 200, 200, 200);
$white = imagecolorallocate($im, 255, 255, 255);

//3.在画布上画图像或者文字

$str= "P";

imagechar($im, 5, 260, 160, $str, $green);
//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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//在图片上面写字
<?php //1.准备画布
$im = imagecreatetruecolor(500,300);
//2.准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$red = imagecolorallocate($im, 255, 0, 0);
$grayred = imagecolorallocate($im, 255, 100, 100);
$green = imagecolorallocate($im, 0, 255, 0);
$blue = imagecolorallocate($im, 0, 0, 255);
$gray = imagecolorallocate($im, 200, 200, 200);
$white = imagecolorallocate($im, 255, 255, 255);

//3.在画布上画图像或者文字

$str= "junzaivip";
$file = "E:/PHP/fonts/SIMYOU.TTF";
// $file = "fonts/SIMYOU.TTF";

imagettftext($im, 50, 0, 100, 200, $green, $file, $str);

//4.输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//5.释放画布资源
imagedestroy($im);
?>
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PHP 验证码的设计
<?php //准备画布
$im = imagecreatetruecolor(100,50);
//准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$gray = imagecolorallocate($im, 200, 200, 200);

//填充背景
imagefill($im, 0, 0, $gray);

//文字坐标
$x = (100-4*20)/2 + 6;
$y = (50-20)/2 + 20;

//在画布上画图像或者文字

//把三个数组联系起来
$strarr = array_merge(range(1, 9),range(a, z),range(A, Z));

//打乱数组
shuffle($strarr);

//array_slice:取数组的前几位
//Join 将数组变成字符串,并且以第一个变量做分隔符
$str = join(&#39;&#39;,array_slice($strarr, 0,4));

$file = "E:/PHP/fonts/msyh.ttf";
// $file = "fonts/msyh.ttf";

imagettftext($im, 20, 0, $x, $y, $black, $file, $str);

//输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//释放画布资源
imagedestroy($im);
?>
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php验证码设计:这里涉及到两个页面:index.php & reg.php
说明:


这个验证码版本只实现了验证图片的动态获取
前台注册页面的验证码和生成图片的验证码进行比较
验证码是由数字 小写字母 大写字母 随机组成


index.php//实现用户的注册

	<title>reg</title>
	<style type="text/css">
	table{

		border-collapse: collapse;

	}

	</style>


<h2>用户注册页面</h2>
<hr>
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姓   名:
密   码:
验证码: PHP第十课 PHP图像处理函数以及验证码实现

reg.php//用来验证验证码是否正确
<?php session_start();
	// echo $_POST[&#39;username&#39;];
	// echo $_POST[&#39;password&#39;];
	$code = strtolower($_POST[&#39;vcode&#39;]);

	// echo $code;

	// echo "<pre class="brush:php;toolbar:false">";
	// print_r($_SESSION);
	// echo "
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"; $vstr = strtolower($_SESSION['vstr']); if ($code==$vstr) { //实现页面的跳转 echo "<script>location=&#39;http://www.baidu.com&#39;</script>"; }else{ echo "<script>alert(&#39;验证码输入错误&#39;)</script>"; //echo "返回注册页面"; echo "<script>location=&#39;index.php&#39;</script>"; } ?>
auth.php 用来生成验证码
<?php //开启session,开启session之前,不能有任何输出
session_start();


$width = 50;//验证码背景宽度
$height = 26;//验证码背景高速
$fonttype = 10;//验证码中字的大小
//准备画布
$im = imagecreatetruecolor($width,$height);
//准备涂料
$black = imagecolorallocate($im, 0, 0, 0);
$gray = imagecolorallocate($im, 200, 200, 200);

//填充背景
imagefill($im, 0, 0, $gray);

//文字坐标
$x = ($width-4*$fonttype)/2 +2;
$y = ($height-$fonttype)/2 + $fonttype;

//在画布上画图像或者文字

//把三个数组联系起来
$strarr = array_merge(range(1, 9),range(a, z),range(A, Z));

//打乱数组
shuffle($strarr);

//array_slice:取数组的前几位
//Join 将数组变成字符串,并且以第一个变量做分隔符
$str = join(&#39;&#39;,array_slice($strarr, 0,4));

//把$str放入session中,可方便所有页面使用
$_SESSION[&#39;vstr&#39;] = $str;

$file = "E:/PHP/fonts/msyh.ttf";
// $file = "fonts/msyh.ttf";

imagettftext($im, $fonttype, 0, $x, $y, $black, $file, $str);

//输出最终图像或保存最终图像
header("content-type:image/png");
imagepng($im);
//释放画布资源
imagedestroy($im);
?>
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php验证码设计:
页面跳转:
1.php跳转
header("location:index.php");


2.js跳转(建议使用)
echo "<script>location = 'http://www.baidu.com'</script>";
echo "<script>location = 'index.php'</script>";


js弹窗:
echo '<script>alert("验证码有误,请重新输入")</script>';


2.缩放
获取图片的宽高
1.getimagesize(); //得到图片的大小  可以直接通过图片("lyf.jpg")就可以获取图片的所有信息
2.imagesx();//得到图片的宽 必须先获取图片的资源(imagecreatefromjpeg("lyf.jpg");),才能得到图片的信息
3.imagesy();//得到图片的高 必须先获取图片的资源,才能得到图片的信息


已经存在的图片形成画布资源:
1.imagecreatefromjpeg();

<?php $im = imagecreatefromjpeg("lyf.jpg");

$x = imagesx($im);
$y = imagesy($im);

echo $x . $y;
exit;



header("content-type:image/jpeg");
imagejpeg($im);
?>
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方法二获取图片的大小:
<?php $imgfile = "lyf.jpg";

$imgarr = getimagesize($imgfile);

echo "<pre class="brush:php;toolbar:false">";
print_r($imgarr);
echo "
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"; exit; $im = imagecreatefromjpeg("lyf.jpg"); echo $x . $y; header("content-type:image/jpeg"); imagejpeg($im); ?>


  图片缩放函数:
  imagecopyresampled();


  图片等比例缩放:

 <?php $imgfile = "lyf.jpg";

	//为了得到大图的宽高
	$imgarr = getimagesize($imgfile);

	$maxw = $imgarr[0];
	$maxh = $imgarr[1];
	$maxt = $imgarr[2];
	$maxm = $imgarr[&#39;mime&#39;];

	//为了把大图变为资源

	$im = imagecreatefromjpeg("lyf.jpg");

	//小图资源
	$minw = 100;
	$minh = 400;


	//等比例缩放
	if (($minw/$maxw)>($minh/$maxh)) {
		$rate =  $minh/$maxh ;		
	}else{
		$rate =  $minw / $maxw ;
	}

	$minw = floor($maxw * $rate);
	$minh = floor($maxh * $rate);
	$minim = imagecreatetruecolor($minw, $minh);

	//把大图缩放成小图
	imagecopyresampled($minim, $im, 0, 0, 0, 0, $minw, $minh, $maxw, $maxh);

	//小图输出
	header("content-type:{$maxm}");

	//判断类型
	switch ($maxt) {
		case 1:
			$imageout = "imagegif";
			break;
		case 2:
			$imageout = "imagejpeg";
			break;
		case 3:
			$imageout = "imagepng";
			break;
		
	}

	$imageout($minim);
	$minfilename = "s_".$imgfile;
	$imageout($minim,$minfilename);
	// imagejpeg($im);


	//释放资源
	imagedestroy($maxim);
	imagedestroy($minim);
	?>
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  图片裁剪函数:
  imagecopyresampled();


  图片水印函数:
  imagecopy();




3.裁剪
4.水印
<?php $maxim = imagecreatefromjpeg("lyf.jpg");
	$minim = imagecreatefromjpeg("lyf.jpg");

	$maxw = imagesx($maxim);
	$maxh = imagesy($maxim);

	$minw = imagesx($minim);
	$minh = imagesy($minim);

	imagecopy($maxim, $minim, $maxw-$minw, $maxh-$minh, 0, 0, $minw, $minh);

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

	imagejpeg($mamim);

 ?>
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