如果你喜歡本博客,請(qǐng)?jiān)L問(wèn)本博客地址:http://blog.csdn.net/junzaivip

概要:

gd庫(kù)畫圖:

數(shù)學(xué)函數(shù)

PHP圖片處理函數(shù)

圖片處理函數(shù)使用場(chǎng)景

1.驗(yàn)證碼
2.縮放
3.裁剪
4.水印

gd庫(kù)畫圖:


1.準(zhǔn)備畫布
2.準(zhǔn)備涂料
3.畫畫
4.輸出圖片
5.保存圖片
6.關(guān)閉畫布

<?php 	//準(zhǔn)備畫布	$im = imagecreatetruecolor(500, 300);	//準(zhǔn)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, $black);	//畫一個(gè)矩形,填充成白色	imagefilledellipse($im, 258, 151, 200, 200, $white);	//輸出到瀏覽器或保存起來(lái)	header("content-type:image/png");	//輸出圖片	imagepng($im);	//關(guān)閉畫布	imagedestroy($im);?>

<?php echo	mt_rand(1,5);?>

<?php //隨機(jī)從一個(gè)數(shù)組中取一個(gè)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(shù)使用場(chǎng)景

1.驗(yàn)證碼
2.縮放
3.裁剪
4.水印

PHP中穿件圖像的五個(gè)步驟
1.準(zhǔn)備畫布
2.準(zhǔn)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(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫圖像或者文字//如果不填充背景,默認(rèn)是黑色imageellipse($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(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫圖像或者文字//如果不填充背景,默認(rèn)是黑色imageline($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(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$black = imagecolorallocate($im, 0, 0, 0);$white = imagecolorallocate($im, 255, 255, 255);//3.在畫布上畫圖像或者文字//產(chǎn)生隨機(jī)的點(diǎn)for ($i=0; $i < 1000; $i++) { imagesetpixel($im,mt_rand(0,500),mt_rand(0,300),$white);}//產(chǎn)生隨機(jī)的線for ($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(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$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(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$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(gè)3D餅狀圖<?php //1.準(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$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(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$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(gè)字符:<?php //1.準(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$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(zhǔn)備畫布$im = imagecreatetruecolor(500,300);//2.準(zhǔn)備涂料$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(zhǔn)備畫布$im = imagecreatetruecolor(100,50);//準(zhǔn)備涂料$black = imagecolorallocate($im, 0, 0, 0);$gray = imagecolorallocate($im, 200, 200, 200);//填充背景imagefill($im, 0, 0, $gray);//文字坐標(biāo)$x = (100-4*20)/2 + 6;$y = (50-20)/2 + 20;//在畫布上畫圖像或者文字//把三個(gè)數(shù)組聯(lián)系起來(lái)$strarr = array_merge(range(1, 9),range(a, z),range(A, Z));//打亂數(shù)組shuffle($strarr);//array_slice:取數(shù)組的前幾位//Join 將數(shù)組變成字符串,并且以第一個(gè)變量做分隔符$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(cè)頁(yè)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(yàn)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(shí)現(xiàn)頁(yè)面的跳轉(zhuǎn)		echo "<script>location='http://www.baidu.com'</script>";	}else{		echo "<script>alert('驗(yàn)證碼輸入錯(cuò)誤')</script>";		//echo "<a href='index.php'>返回注冊(cè)頁(yè)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();$width = 50;//驗(yàn)證碼背景寬度$height = 26;//驗(yàn)證碼背景高速$fonttype = 10;//驗(yàn)證碼中字的大小//準(zhǔn)備畫布$im = imagecreatetruecolor($width,$height);//準(zhǔn)備涂料$black = imagecolorallocate($im, 0, 0, 0);$gray = imagecolorallocate($im, 200, 200, 200);//填充背景imagefill($im, 0, 0, $gray);//文字坐標(biāo)$x = ($width-4*$fonttype)/2 +2;$y = ($height-$fonttype)/2 + $fonttype;//在畫布上畫圖像或者文字//把三個(gè)數(shù)組聯(lián)系起來(lái)$strarr = array_merge(range(1, 9),range(a, z),range(A, Z));//打亂數(shù)組shuffle($strarr);//array_slice:取數(shù)組的前幾位//Join 將數(shù)組變成字符串,并且以第一個(gè)變量做分隔符$str = join('',array_slice($strarr, 0,4));//把$str放入session中,可方便所有頁(yè)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(jīng)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?yōu)橘Y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(quán)歸原作者所有，轉(zhuǎn)載文章僅為傳播更多信息之目的，如作者信息標(biāo)記有誤，請(qǐng)第一時(shí)間聯(lián)系我們修改或刪除，多謝。