PHP利用GD库处理图片方法实现

PHP图片处理技巧

最新推荐文章于 2021-04-06 18:37:17 发布

转载最新推荐文章于 2021-04-06 18:37:17 发布 · 277 阅读

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CC 4.0 BY-SA版权

原文链接：https://my.oschina.net/ganfanghua/blog/1619831

文章标签：

#php #python

本文介绍如何使用PHP进行图片处理，包括添加文字和图片水印、剪切图片、旋转及翻转图片等操作，并提供具体实现代码。

2019独角兽企业重金招聘Python工程师标准>>>

图片处理函数

http://www.runoob.com/php/php-image-gd.html

添加水印(文字和图片）

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<?php

/**

* [创建图片文字水印]

* @param [string] $imagename [需要添加水印的值]

* @param [string] $string [图片上添加的文字]

* @param [string] $locate [水印位置，center,left_buttom,right_buttom三选一]

* @return [null] [description]

*/

function create_words_watermark($imagename,$string,$locate){

list($width,$height,$type)=getimagesize($imagename);

$types=array(1 => "GIF",2 => "JPEG",3 => "PNG",

4 => "SWF",5 => "PSD",6 => "BMP",

7 => "TIFF",8 => "TIFF",9 => "JPC",

10 => "JP2",11 => "JPX",12 => "JB2",

13 => "SWC",14 => "IFF",15 => "WBMP",16 => "XBM");

$type=strtolower($types[$type]);

$create="imagecreatefrom".$type;

$img=$create($imagename);//imagecreatefromjpeg() 成功后返回图象资源,失败后返回 FALSE

$string_color=imagecolorallocate($img,200, 200, 200);

$fontsize=4;

// 图片的宽和高也可用下面两个函数获得

// $width=imagesx($img);

// $height=imagesy($img);

switch($locate){

case 'center':

$x=($width-imagefontwidth($fontsize)*strlen($string))/2;

$y=($height-imagefontheight($fontsize))/2;

break;

case 'left_buttom':

$x=5;

$y=($height-imagefontheight($fontsize)-3);

break;

case 'right_buttom':

$x=($width-imagefontwidth($fontsize)*strlen($string)-3);

$y=($height-imagefontheight($fontsize)-3);

break;

default:

die("未指定水印位置!");

break;

}

imagestring($img,$fontsize,$x,$y,$string,$string_color);

imagestring($img,$fontsize,$x+1,$y+1,$string,$string_color);

//imagegif()、imagejpeg()、imagepng() 和 imagewbmp() 函数分别允许以 GIF、JPEG、PNG 和 WBMP 格式将图像输出到浏览器或文件

$save="image".$type;

//保存

//$save($img,"new_".$imagename);

//显示

header("content-type:image/".$type);

$save($img);

imagedestroy($img); //$img资源使用结束，销毁

}

// create_words_watermark("test.png","hello world","right_buttom");

/**

* [create_pic_watermark 添加图片水印]

* @param [string] $dest_image [需要添加图片水印的图片名]

* @param [string] $watermark [水印图片名]

* @param [string] $locate [水印位置，center,left_buttom,right_buttom三选一]

* @return [type] [description]

*/

function create_pic_watermark($dest_image,$watermark,$locate){

list($dwidth,$dheight,$dtype)=getimagesize($dest_image);

list($wwidth,$wheight,$wtype)=getimagesize($watermark);

$types=array(1 => "GIF",2 => "JPEG",3 => "PNG",

4 => "SWF",5 => "PSD",6 => "BMP",

7 => "TIFF",8 => "TIFF",9 => "JPC",

10 => "JP2",11 => "JPX",12 => "JB2",

13 => "SWC",14 => "IFF",15 => "WBMP",16 => "XBM");

$dtype=strtolower($types[$dtype]);//原图类型

$wtype=strtolower($types[$wtype]);//水印图片类型

$created="imagecreatefrom".$dtype;

$createw="imagecreatefrom".$wtype;

$imgd=$created($dest_image);

$imgw=$createw($watermark);

switch($locate){

case 'center':

$x=($dwidth-$wwidth)/2;

$y=($dheight-$wheight)/2;

break;

case 'left_buttom':

$x=1;

$y=($dheight-$wheight-2);

break;

case 'right_buttom':

$x=($dwidth-$wwidth-1);

$y=($dheight-$wheight-2);

break;

default:

die("未指定水印位置!");

break;

}

imagecopy($imgd,$imgw,$x,$y,0,0, $wwidth,$wheight);

$save="image".$dtype;

//显示

header("content-type:image/".$dtype);

$save($imgd);

imagedestroy($imgw);

imagedestroy($imgd);

}

create_pic_watermark("ganlixin.jpg","test.png","left_buttom");

?>

剪切图片

<?php

/**

* [cut_image] 从原图中剪切一部分

* @param [string] $old_imagename [需要剪切的图片名]

* @param [int] $start_width [从原图片宽为的$start_width开始剪切]

* @param [int] $start_height [从原图片高为的$start_height开始剪切]

* @param [int] $new_width [从原图片中剪切$new_width的宽度]

* @param [int] $new_height [从原图片中剪切$new_height的高度]

* @return [null] [null]

*/

function cut_image($old_imagename,$start_width,$start_height,$new_width,$new_height){

list($old_width,$old_height,$type)=getimagesize($old_imagename);

$types=array(1 => "GIF",2 => "JPEG",3 => "PNG",

4 => "SWF",5 => "PSD",6 => "BMP",

7 => "TIFF",8 => "TIFF",9 => "JPC",

10 => "JP2",11 => "JPX",12 => "JB2",

13 => "SWC",14 => "IFF",15 => "WBMP",16 => "XBM");

$type=strtolower($types[$type]);

$create="imagecreatefrom".$type;

$old_img=$create($old_imagename);

/*

用imagecreatetruecolor(int x,int y)建立的是一幅大小为 x和 y的黑色图像(默认为黑色)，如想改变背景颜色则需要用填充颜色函数imagefill($img,0,0,$color); imagecreate 新建一个空白图像资源，用imagecolorAllocate()添加背景色

$new_img=imagecreatetruecolor($new_width, $new_height);

bool imagecopyresampled ( resource $dst_image , resource $src_image , int $dst_x , int $dst_y , int $src_x , int $src_y , int $dst_w , int $dst_h ,int $src_w , int $src_h )

$dst_image：新建的图片

$src_image：需要载入的图片

$dst_x：设定需要载入的图片在新图中的x坐标

$dst_y：设定需要载入的图片在新图中的y坐标

$src_x：设定载入图片要载入的区域x坐标

$src_y：设定载入图片要载入的区域y坐标

$dst_w：设定载入的原图的宽度（在此设置缩放）

$dst_h：设定载入的原图的高度（在此设置缩放）

$src_w：原图要载入的宽度

$src_h：原图要载入的高度

imagecopyresampled($new_img,$old_img,0,0,$start_width,$start_height,$new_width,$new_height,$new_width,$new_height);

$save="image".$type;

//保存

//$save($new_img,"new_".$old_imagename);

//显示

header("content-type:image/".$type);

$save($new_img);

//销毁

imagedestroy($old_img);

imagedestroy($new_img);

}

cut_image("ganlixin.jpg",0,0,200,200);

?>

翻转图片

<?php

/**

* [rotate_image 图片旋转]

* @param [string] $imagename [要进行旋转的图片名]

* @param [string] $angle [旋转的角度，逆时针为正]

* @return [null] [description]

*/

function rotate_image($imagename,$angle){

list($width,$height,$type)=getimagesize($imagename);

$types=array(1 => "GIF",2 => "JPEG",3 => "PNG",

4 => "SWF",5 => "PSD",6 => "BMP",

7 => "TIFF",8 => "TIFF",9 => "JPC",

10 => "JP2",11 => "JPX",12 => "JB2",

13 => "SWC",14 => "IFF",15 => "WBMP",16 => "XBM");

$type=$types[$type];

$create="imagecreatefrom".$type;

$img=$create($imagename);

$new_img=imagerotate($img,$angle,0);

$save="image".$type;

//显示

header("content-type:image/".$type);

$save($new_img);

// 保存

// $save($new_img,"new_".$imagename);

imagedestroy($img);

imagedestroy($new_img);

}

rotate_image("ganlixin.jpg",-90);

?>

翻转图片

<?php

/**

* [overturn_image 翻转图片]

* @param [string] $imagename [要反转的图片名]

* @param [char] $method [按x轴或y轴翻转，只有x，y选项]

* @return [type] [description]

*/

function overturn_image($imagename,$method){

$method=strtolower($method);

list($width,$height,$type)=getimagesize($imagename);

$types=array(1 => "GIF",2 => "JPEG",3 => "PNG",

4 => "SWF",5 => "PSD",6 => "BMP",

7 => "TIFF",8 => "TIFF",9 => "JPC",

10 => "JP2",11 => "JPX",12 => "JB2",

13 => "SWC",14 => "IFF",15 => "WBMP",16 => "XBM");

$type=$types[$type];

$create="imagecreatefrom".$type;

$img=$create($imagename);//源图片

$new_img=imagecreatetruecolor($width,$height);//翻转之后的图片

if($method=='y'){

for($i=0;$i<$width;$i++){

imagecopy($new_img,$img,$width-$i-1,0,$i,0,1,$height);

}

} else if($method=='x'){

for($i=0;$i<$height;$i++){

imagecopy($new_img,$img,0,$height-$i-1,0,$i,$width,1);

}

$save="image".$type;

//显示

header("content-type:image/".$type);

$save($new_img);

// 保存

// $save($new_img,"new_".$imagename);

imagedestroy($img);

imagedestroy($new_img);

}

overturn_image("ganlixin.jpg","y");

?>

参考：

http://www.cnblogs.com/-beyond/p/7218226.html

转载于:https://my.oschina.net/ganfanghua/blog/1619831