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概要:
gd庫畫圖:
數學函數
PHP圖片處理函數
圖片處理函數使用場景
1.驗證碼
2.縮放
3.裁剪
4.水印
gd庫畫圖:
1.準備畫布
2.準備涂料
3.畫畫
4.輸出圖片
5.保存圖片
6.關閉畫布
<?php //準備畫布 $im = imagecreatetruecolor(500, 300); //準備涂料 $black = imagecolorallocate($im, 0, 0, 0); $white = imagecolorallocate($im, 255, 255, 255); //背景填充成黑色 imagefill($im,0,0, $black); //畫一個矩形,填充成白色 imagefilledellipse($im, 258, 151, 200, 200, $white); //輸出到瀏覽器或保存起來 header("content-type:image/png"); //輸出圖片 imagepng($im); //關閉畫布 imagedestroy($im);?>PHP圖片處理函數
<?php echo mt_rand(1,5);?>
<?php //隨機從一個數組中取一個值$arr = array("a","b","c","d","e");$rkey = mt_rand(0,count($arr)-1);echo $arr[$rkey];?><?php echo ceil(2.4);//3 echo floor(2.4);//2 echo round(2.4);//2 echo round(2.6);//3?>
6.pi(); //π 取圓周率
<?phpecho(pi());echo M_PI;?>
圖片處理函數使用場景
1.驗證碼
2.縮放
3.裁剪
4.水印
PHP中穿件圖像的五個步驟
1.準備畫布
2.準備涂料
3.在畫布上畫圖像或者文字
4.輸出最終圖像或曹村最終圖像
5.釋放畫布資源
<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備涂料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫圖像或者文字//如果不填充背景,默認是黑色imageellipse($im,258,151,200,200,$white);//4.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>//畫線<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備涂料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫圖像或者文字//如果不填充背景,默認是黑色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.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>//添加干擾素<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備涂料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫圖像或者文字//產生隨機的點for ($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), $white);}//4.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>//畫矩形:<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備涂料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫圖像或者文字imagerectangle($im, 20, 20, 480, 280, $white);//imagefilledrectangle($im, 20, 20, 480, 280, $white);//填充//4.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($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.準備涂料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫圖像或者文字$arr = array( 250,20, 60,240, 440,240 );imagepolygon($im, $arr, 3, $white);//4.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($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.在畫布上畫圖像或者文字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, $blue,IMG_ARC_PIE);//4.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>//寫文字:<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備涂料$black = imagecolorallocate($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.在畫布上畫圖像或者文字$str= "PHP is very much";imagestring($im, 5, 260, 160, $str, $green);//4.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?>//寫單個字符:<?php //1.準備畫布$im = imagecreatetruecolor(500,300);//2.準備涂料$black = imagecolorallocate($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.在畫布上畫圖像或者文字$str= "P";imagechar($im, 5, 260, 160, $str, $green);//4.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($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.在畫布上畫圖像或者文字$str= "junzaivip";$file = "E:/PHP/fonts/SIMYOU.TTF";// $file = "fonts/SIMYOU.TTF";imagettftext($im, 50, 0, 100, 200, $green, $file, $str);//4.輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($im);//5.釋放畫布資源imagedestroy($im);?><?php //準備畫布$im = imagecreatetruecolor(100,50);//準備涂料$black = imagecolorallocate($im, 0, 0, 0);$gray = imagecolorallocate($im, 200, 200, 200);//填充背景imagefill($im, 0, 0, $gray);//文字坐標$x = (100-4*20)/2 + 6;$y = (50-20)/2 + 20;//在畫布上畫圖像或者文字//把三個數組聯系起來$strarr = array_merge(range(1, 9),range(a, z),range(A, Z));//打亂數組shuffle($strarr);//array_slice:取數組的前幾位//Join 將數組變成字符串,并且以第一個變量做分隔符$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, $str);//輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($im);//釋放畫布資源imagedestroy($im);?><html><head> <title>reg</title> <style type="text/css"> table{ border-collapse: collapse; } </style></head><body><h4>用戶注冊頁面</h4><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 = "重置" name = "submit"></td></tr></form></table></body></html>
<?php session_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'>返回注冊頁面</a>"; echo "<script>location='index.php'</script>"; }?><?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, $gray);//文字坐標$x = ($width-4*$fonttype)/2 +2;$y = ($height-$fonttype)/2 + $fonttype;//在畫布上畫圖像或者文字//把三個數組聯系起來$strarr = array_merge(range(1, 9),range(a, z),range(A, Z));//打亂數組shuffle($strarr);//array_slice:取數組的前幾位//Join 將數組變成字符串,并且以第一個變量做分隔符$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, $str);//輸出最終圖像或保存最終圖像header("content-type:image/png");imagepng($im);//釋放畫布資源imagedestroy($im);?>已經存在的圖片形成畫布資源:
1.imagecreatefromjpeg();
<?php$im = imagecreatefromjpeg("lyf.jpg");$x = imagesx($im);$y = imagesy($im);echo $x . $y;exit;header("content-type:image/jpeg");imagejpeg($im);?><?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); ?><?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); ?>鄭重聲明：本文版權歸原作者所有，轉載文章僅為傳播更多信息之目的，如作者信息標記有誤，請第一時間聯系我們修改或刪除，多謝。
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