PHP第十課 PHP影像處理函數以及驗證碼實現

標籤：圖片縮放函數   php驗證碼實現   php圖片裁剪   php圖片添加浮水印   

如果你喜歡本部落格,請訪問本部落格地址:http://blog.csdn.net/junzaivip

概要:

gd庫畫圖:

數學函數

PHP圖片處理函數

圖片處理函數使用情境

1.驗證碼
2.縮放
3.裁剪
4.浮水印

gd庫畫圖:


1.準備畫布
2.準備塗料
3.畫畫
4.輸出圖片
5.儲存圖片
6.關閉畫布

<?php //準備畫布$im = imagecreatetruecolor(500, 300);//準備塗料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//背景填充成黑色imagefill($im,0,0, $black);//畫一個矩形,填充成白色imagefilledellipse($im, 258, 151, 200, 200, $white);//輸出到瀏覽器或儲存起來header("content-type:image/png");//輸出圖片imagepng($im);//關閉畫布imagedestroy($im);?>

PHP圖片處理函數
1.數學函數
2.圖片處理函數




數學函數:
1.max();
2.min();
3.mt_rand();隨機取一個數字

<?php echomt_rand(1,5);?>

mt_rand隨機取一個值

<?php //隨機從一個數組中取一個值$arr = array("a","b","c","d","e");$rkey = mt_rand(0,count($arr)-1);echo $arr[$rkey];?>

4.ceil();天花板 
5.floor();
6.round();四捨五入

<?php echo ceil(2.4);//3echo floor(2.4);//2echo round(2.4);//2echo round(2.6);//3?>

6.pi(); //π 取圓周率

<?php echo(pi());echo M_PI;?>

圖片處理函數使用情境

1.驗證碼
2.縮放
3.裁剪
4.浮水印

PHP中穿件映像的五個步驟
1.準備畫布
2.準備塗料
3.在畫布上畫映像或者文字
4.輸出最終映像或曹村最終映像
5.釋放畫布資源

<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫映像或者文字//如果不填充背景,預設是黑色imageellipse($im,258,151,200,200,$white);//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

繪製映像:
imagefill();
imagesetpixel();//畫像素點
imageline();//畫線
imagerectangle();//畫一個矩形
imagepolygon();//畫一個多邊形
imageellipse();//畫一個橢圓
imageare();畫一個圓弧
imagechar();//水平的畫一個字元
imagestring();//水平的畫一行字串

//畫線<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫映像或者文字//如果不填充背景,預設是黑色imageline($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,$white);//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

//添加幹擾素<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫映像或者文字//產生隨機的點for ($i=0; $i < 1000; $i++) { imagesetpixel($im,mt_rand(0,500),mt_rand(0,300),$white);}//產生隨機的線for ($j=0; $j < 100; $j++) { imageline($im, mt_rand(0,500), mt_rand(0,300), mt_rand(0,500), mt_rand(0,300), $white);}//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

//畫矩形:<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫映像或者文字imagerectangle($im, 20, 20, 480, 280, $white);//imagefilledrectangle($im, 20, 20, 480, 280, $white);//填充//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

//imagepolygon 畫多邊形_畫三角形<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫映像或者文字$arr = array(250,20,60,240,440,240);imagepolygon($im, $arr, 3, $white);//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

畫一個3D餅狀圖<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$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($im, 255, 255, 255);//3.在畫布上畫映像或者文字for ($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, $blue,IMG_ARC_PIE);//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

轉載請註明出處: http://blog.csdn.net/junzaivip

//寫文字:<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$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($im, 255, 255, 255);//3.在畫布上畫映像或者文字$str= "PHP is very much";imagestring($im, 5, 260, 160, $str, $green);//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

//寫單個字元:<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$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($im, 255, 255, 255);//3.在畫布上畫映像或者文字$str= "P";imagechar($im, 5, 260, 160, $str, $green);//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

//在圖片上面寫字<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備塗料$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($im, 255, 255, 255);//3.在畫布上畫映像或者文字$str= "junzaivip";$file = "E:/PHP/fonts/SIMYOU.TTF";// $file = "fonts/SIMYOU.TTF";imagettftext($im, 50, 0, 100, 200, $green, $file, $str);//4.輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>

PHP 驗證碼的設計

<?php //準備畫布$im = imagecreatetruecolor(100,50);//準備塗料$black = imagecolorallocate($im, 0, 0, 0);$gray = imagecolorallocate($im, 200, 200, 200);//填充背景imagefill($im, 0, 0, $gray);//文字座標$x = (100-4*20)/2 + 6;$y = (50-20)/2 + 20;//在畫布上畫映像或者文字//把三個數組聯絡起來$strarr = array_merge(range(1, 9),range(a, z),range(A, Z));//打亂數組shuffle($strarr);//array_slice:取數組的前幾位//Join 將數組變成字串,並且以第一個變數做分隔字元$str = join('',array_slice($strarr, 0,4));$file = "E:/PHP/fonts/msyh.ttf";// $file = "fonts/msyh.ttf";imagettftext($im, 20, 0, $x, $y, $black, $file, $str);//輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//釋放畫布資源imagedestroy($im);?>

php驗證碼設計:這裡涉及到兩個頁面:index.php & reg.php
說明:


這個驗證碼版本只實現了驗證圖片的動態擷取
前台註冊頁面的驗證碼和產生圖片的驗證碼進行比較
驗證碼是由數字 小寫字母 大寫字母 隨機組成


index.php//實現使用者的註冊

<html><head><title>reg</title><style type="text/css">table{border-collapse: collapse;}</style></head><body><h2>使用者註冊頁面</h2><hr><table widtd = "500px" border = "1px"><form action = "reg.php" method = "post"><tr><td>姓   名:</td><td colspan = "2"><input type = "text" name="username" id = ""></td></tr><tr><td>密   碼:</td><td colspan = "2"><input type = "password" name="password" id = ""></td></tr><tr><td>驗證碼:</td><td align = "center" valign = "middle"><input type = "text" id = "auth" name = "vcode"> </td><td><img src="auth.php"></tr><tr><td><input type = "submit" value = "submit" name = "submit"></td><td colspan = "2"><input type = "reset" value = "重設" name = "submit"></td></tr></form></table></body></html>

reg.php//用來驗證驗證碼是否正確

<?phpsession_start();// echo $_POST['username'];// echo $_POST['password'];$code = strtolower($_POST['vcode']);// echo $code;// echo "<pre>";// print_r($_SESSION);// echo "</pre>";$vstr = strtolower($_SESSION['vstr']);if ($code==$vstr) {//實現頁面的跳轉echo "<script>location='http://www.baidu.com'</script>";}else{echo "<script>alert('驗證碼輸入錯誤')</script>";//echo "<a href='index.php'>返回註冊頁面</a>";echo "<script>location='index.php'</script>";}?>

auth.php 用來產生驗證碼

<?php //開啟session,開啟session之前,不能有任何輸出session_start();$width = 50;//驗證碼背景寬度$height = 26;//驗證碼背景高速$fonttype = 10;//驗證碼中字的大小//準備畫布$im = imagecreatetruecolor($width,$height);//準備塗料$black = imagecolorallocate($im, 0, 0, 0);$gray = imagecolorallocate($im, 200, 200, 200);//填充背景imagefill($im, 0, 0, $gray);//文字座標$x = ($width-4*$fonttype)/2 +2;$y = ($height-$fonttype)/2 + $fonttype;//在畫布上畫映像或者文字//把三個數組聯絡起來$strarr = array_merge(range(1, 9),range(a, z),range(A, Z));//打亂數組shuffle($strarr);//array_slice:取數組的前幾位//Join 將數組變成字串,並且以第一個變數做分隔字元$str = join('',array_slice($strarr, 0,4));//把$str放入session中,可方便所有頁面使用$_SESSION['vstr'] = $str;$file = "E:/PHP/fonts/msyh.ttf";// $file = "fonts/msyh.ttf";imagettftext($im, $fonttype, 0, $x, $y, $black, $file, $str);//輸出最終映像或儲存最終映像header("content-type:image/png");imagepng($im);//釋放畫布資源imagedestroy($im);?>

php驗證碼設計:
頁面跳轉:
1.php跳轉
header("location:index.php");


2.js跳轉(建議使用)
echo "<script>location = ‘http://www.baidu.com‘</script>";
echo "<script>location = ‘index.php‘</script>";


js彈窗:
echo ‘<script>alert("驗證碼有誤,請重新輸入")</script>‘;


2.縮放
擷取圖片的寬高
1.getimagesize(); //得到圖片的大小  可以直接通過圖片("lyf.jpg")就可以擷取圖片的所有資訊
2.imagesx();//得到圖片的寬 必須先擷取圖片的資源(imagecreatefromjpeg("lyf.jpg");),才能得到圖片的資訊
3.imagesy();//得到圖片的高 必須先擷取圖片的資源,才能得到圖片的資訊

已經存在的圖片形成畫布資源:
1.imagecreatefromjpeg();

<?php$im = imagecreatefromjpeg("lyf.jpg");$x = imagesx($im);$y = imagesy($im);echo $x . $y;exit;header("content-type:image/jpeg");imagejpeg($im);?>

方法二擷取圖片的大小:

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

  圖片縮放函數:
  imagecopyresampled();

  圖片等比例縮放:

 <?php$imgfile = "lyf.jpg";//為了得到大圖的寬高$imgarr = getimagesize($imgfile);$maxw = $imgarr[0];$maxh = $imgarr[1];$maxt = $imgarr[2];$maxm = $imgarr['mime'];//為了把大圖變為資源$im = imagecreatefromjpeg("lyf.jpg");//小圖資源$minw = 100;$minh = 400;//等比例縮放if (($minw/$maxw)>($minh/$maxh)) {$rate =  $minh/$maxh ;}else{$rate =  $minw / $maxw ;}$minw = floor($maxw * $rate);$minh = floor($maxh * $rate);$minim = imagecreatetruecolor($minw, $minh);//把大圖縮放成小圖imagecopyresampled($minim, $im, 0, 0, 0, 0, $minw, $minh, $maxw, $maxh);//小圖輸出header("content-type:{$maxm}");//判斷類型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);//釋放資源imagedestroy($maxim);imagedestroy($minim);?>

  圖片裁剪函數:
  imagecopyresampled();


  圖片浮水印函數:
  imagecopy();




3.裁剪
4.浮水印

<?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); ?>

PHP第十課 PHP影像處理函數以及驗證碼實現