本文实例讲述了php将图片保存为不同规格的图片类。分享给大家供大家参考。具体如下：
图片处理类.imagecls.php如下：
<?php
/**
图片处理类
*/
class imagecls
{
/**
* 文件信息
*/
var $file = array();
/**
* 保存目录
*/
var $dir = '';
/**
* 错误代码
*/
var $error_code = 0;
/**
* 文件上传最大kb
*/
var $max_size = -1;
function es_imagecls()
{
}
private function checksize($size)
{
return !($size > $this->max_size) || (-1 == $this->max_size);
}
/**
* 处理上传文件
* @param array $file 上传的文件
* @param string $dir 保存的目录
* @return bool
*/
function init($file, $dir = 'temp')
{
if(!is_array($file) || empty($file) || !$this->isuploadfile($file['tmp_name']) || trim($file['name']) == '' || $file['size'] == 0)
{
$this->file = array();
$this->error_code = -1;
return false;
}
else
{
$file['size'] = intval($file['size']);
$file['name'] = trim($file['name']);
$file['thumb'] = '';
$file['ext'] = $this->fileext($file['name']);
$file['name'] = htmlspecialchars($file['name'], ent_quotes);
$file['is_image'] = $this->isimageext($file['ext']);
$file['file_dir'] = $this->gettargetdir($dir);
$file['prefix'] = md5(microtime(true)).rand(10,99);
$file['target'] = "./public/".$file['file_dir'].'/'.$file['prefix'].'.jpg'; //相对
$file['local_target'] = app_root_path."public/".$file['file_dir'].'/'.$file['prefix'].'.jpg'; //物理
$this->file = &$file;
$this->error_code = 0;
return true;
}
}
/**
* 保存文件
* @return bool
*/
function save()
{
if(empty($this->file) || empty($this->file['tmp_name']))
$this->error_code = -101;
elseif(!$this->checksize($this->file['size']))
$this->error_code = -105;
elseif(!$this->file['is_image'])
$this->error_code = -102;
elseif(!$this->savefile($this->file['tmp_name'], $this->file['local_target']))
$this->error_code = -103;
elseif($this->file['is_image'] && (!$this->file['image_info'] = $this->getimageinfo($this->file['local_target'], true)))
{
$this->error_code = -104;
@unlink($this->file['local_target']);
}
else
{
$this->error_code = 0;
return true;
}
return false;
}
/**
* 获取错误代码
* @return number
*/
function error()
{
return $this->error_code;
}
/**
* 获取文件扩展名
* @return string
*/
function fileext($file_name)
{
return addslashes(strtolower(substr(strrchr($file_name, '.'), 1, 10)));
}
/**
* 根据扩展名判断文件是否为图像
* @param string $ext 扩展名
* @return bool
*/
function isimageext($ext)
{
static $img_ext = array('jpg', 'jpeg', 'png', 'bmp','gif','giff');
return in_array($ext, $img_ext) ? 1 : 0;
}
/**
* 获取图像信息
* @param string $target 文件路径
* @return mixed
*/
function getimageinfo($target)
{
$ext = es_imagecls::fileext($target);
$is_image = es_imagecls::isimageext($ext);
if(!$is_image)
return false;
elseif(!is_readable($target))
return false;
elseif($image_info = @getimagesize($target))
{
list($width, $height, $type) = !empty($image_info) ? $image_info : array('', '', '');
$size = $width * $height;
if($is_image && !in_array($type, array(1,2,3,6,13)))
return false;
$image_info['type'] = strtolower(substr(image_type_to_extension($image_info[2]),1));
return $image_info;
}
else
return false;
}
/**
* 获取是否充许上传文件
* @param string $source 文件路径
* @return bool
*/
function isuploadfile($source)
{
return $source && ($source != 'none') && (is_uploaded_file($source) || is_uploaded_file(str_replace('\\', '\', $source)));
}
/**
* 获取保存的路径
* @param string $dir 指定的保存目录
* @return string
*/
function gettargetdir($dir)
{
if (!is_dir(app_root_path."public/".$dir)) {
@mkdir(app_root_path."public/".$dir);
@chmod(app_root_path."public/".$dir, 0777);
}
return $dir;
}
/**
* 保存文件
* @param string $source 源文件路径
* @param string $target 目录文件路径
* @return bool
*/
private function savefile($source, $target)
{
if(!es_imagecls::isuploadfile($source))
$succeed = false;
elseif(@copy($source, $target))
$succeed = true;
elseif(function_exists('move_uploaded_file') && @move_uploaded_file($source, $target))
$succeed = true;
elseif (@is_readable($source) && (@$fp_s = fopen($source, 'rb')) && (@$fp_t = fopen($target, 'wb')))
{
while (!feof($fp_s))
{
$s = @fread($fp_s, 1024 * 512);
@fwrite($fp_t, $s);
}
fclose($fp_s);
fclose($fp_t);
$succeed = true;
}
if($succeed)
{
$this->error_code = 0;
@chmod($target, 0644);
@unlink($source);
}
else
{
$this->error_code = 0;
}
return $succeed;
}
public function thumb($image,$maxwidth=200,$maxheight=50,$gen = 0,$interlace=true,$filepath = '',$is_preview = true)
{
$info = es_imagecls::getimageinfo($image);
if($info !== false)
{
$srcwidth = $info[0];
$srcheight = $info[1];
$type = $info['type'];
$interlace = $interlace? 1:0;
unset($info);
if($maxwidth > 0 && $maxheight > 0)
$scale = min($maxwidth/$srcwidth, $maxheight/$srcheight); // 计算缩放比例
elseif($maxwidth == 0)
$scale = $maxheight/$srcheight;
elseif($maxheight == 0)
$scale = $maxwidth/$srcwidth;
$paths = pathinfo($image);
$paths['filename'] = trim(strtolower($paths['basename']),".".strtolower($paths['extension']));
$basefilename = explode("_",$paths['filename']);
$basefilename = $basefilename[0];
if(empty($filepath))
{
if($is_preview)
$thumbname = $paths['dirname'].'/'.$basefilename.'_'.$maxwidth.'x'.$maxheight.'.jpg';
else
$thumbname = $paths['dirname'].'/'.$basefilename.'o_'.$maxwidth.'x'.$maxheight.'.jpg';
}
else
$thumbname = $filepath;
$thumburl = str_replace(app_root_path,'./',$thumbname);
if($scale >= 1)
{
// 超过原图大小不再缩略
$width = $srcwidth;
$height = $srcheight;
if(!$is_preview)
{
//非预览模式写入原图
file_put_contents($thumbname,file_get_contents($image)); //用原图写入
return array('url'=>$thumburl,'path'=>$thumbname);
}
}
else
{
// 缩略图尺寸
$width = (int)($srcwidth*$scale);
$height = (int)($srcheight*$scale);
}
if($gen == 1)
{
$width = $maxwidth;
$height = $maxheight;
}
// 载入原图
$createfun = 'imagecreatefrom'.($type=='jpg'?'jpeg':$type);
if(!function_exists($createfun))
$createfun = 'imagecreatefromjpeg';
$srcimg = $createfun($image);
//创建缩略图
if($type!='gif' && function_exists('imagecreatetruecolor'))
$thumbimg = imagecreatetruecolor($width, $height);
else
$thumbimg = imagecreate($width, $height);
$x = 0;
$y = 0;
if($gen == 1 && $maxwidth > 0 && $maxheight > 0)
{
$resize_ratio = $maxwidth/$maxheight;
$src_ratio = $srcwidth/$srcheight;
if($src_ratio >= $resize_ratio)
{
$x = ($srcwidth - ($resize_ratio * $srcheight)) / 2;
$width = ($height * $srcwidth) / $srcheight;
}
else
{
$y = ($srcheight - ( (1 / $resize_ratio) * $srcwidth)) / 2;
$height = ($width * $srcheight) / $srcwidth;
}
}
// 复制图片
if(function_exists("imagecopyresampled"))
imagecopyresampled($thumbimg, $srcimg, 0, 0, $x, $y, $width, $height, $srcwidth,$srcheight);
else
imagecopyresized($thumbimg, $srcimg, 0, 0, $x, $y, $width, $height, $srcwidth,$srcheight);
if('gif'==$type || 'png'==$type) {
$background_color = imagecolorallocate($thumbimg, 0,255,0); // 指派一个绿色
imagecolortransparent($thumbimg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图
}
// 对jpeg图形设置隔行扫描
if('jpg'==$type || 'jpeg'==$type)
imageinterlace($thumbimg,$interlace);
// 生成图片
imagejpeg($thumbimg,$thumbname,100);
imagedestroy($thumbimg);
imagedestroy($srcimg);
return array('url'=>$thumburl,'path'=>$thumbname);
}
return false;
}
public function make_thumb($srcimg,$srcwidth,$srcheight,$type,$maxwidth=200,$maxheight=50,$gen = 0)
{
$interlace = $interlace? 1:0;
if($maxwidth > 0 && $maxheight > 0)
$scale = min($maxwidth/$srcwidth, $maxheight/$srcheight); // 计算缩放比例
elseif($maxwidth == 0)
$scale = $maxheight/$srcheight;
elseif($maxheight == 0)
$scale = $maxwidth/$srcwidth;
if($scale >= 1)
{
// 超过原图大小不再缩略
$width = $srcwidth;
$height = $srcheight;
}
else
{
// 缩略图尺寸
$width = (int)($srcwidth*$scale);
$height = (int)($srcheight*$scale);
}
if($gen == 1)
{
$width = $maxwidth;
$height = $maxheight;
}
//创建缩略图
if($type!='gif' && function_exists('imagecreatetruecolor'))
$thumbimg = imagecreatetruecolor($width, $height);
else
$thumbimg = imagecreatetruecolor($width, $height);
$x = 0;
$y = 0;
if($gen == 1 && $maxwidth > 0 && $maxheight > 0)
{
$resize_ratio = $maxwidth/$maxheight;
$src_ratio = $srcwidth/$srcheight;
if($src_ratio >= $resize_ratio)
{
$x = ($srcwidth - ($resize_ratio * $srcheight)) / 2;
$width = ($height * $srcwidth) / $srcheight;
}
else
{
$y = ($srcheight - ( (1 / $resize_ratio) * $srcwidth)) / 2;
$height = ($width * $srcheight) / $srcwidth;
}
}
// 复制图片
if(function_exists("imagecopyresampled"))
imagecopyresampled($thumbimg, $srcimg, 0, 0, $x, $y, $width, $height, $srcwidth,$srcheight);
else
imagecopyresized($thumbimg, $srcimg, 0, 0, $x, $y, $width, $height, $srcwidth,$srcheight);
if('gif'==$type || 'png'==$type) {
$background_color = imagecolorallocate($thumbimg, 255,255,255); // 指派一个绿色
imagecolortransparent($thumbimg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图
}
// 对jpeg图形设置隔行扫描
if('jpg'==$type || 'jpeg'==$type)
imageinterlace($thumbimg,$interlace);
return $thumbimg;
}
public function water($source,$water,$alpha=80,$position="0")
{
//检查文件是否存在
if(!file_exists($source)||!file_exists($water))
return false;
//图片信息
$sinfo = es_imagecls::getimageinfo($source);
$winfo = es_imagecls::getimageinfo($water);
//如果图片小于水印图片，不生成图片
if($sinfo["0"] < $winfo["0"] || $sinfo['1'] < $winfo['1'])
return false;
if(is_animated_gif($source))
{
require_once app_root_path."system/utils/gif_encoder.php";
require_once app_root_path."system/utils/gif_reader.php";
$gif = new gifreader();
$gif->load($source);
foreach($gif->imgs['frames'] as $k=>$img)
{
$im = imagecreatefromstring($gif->getgif($k));
//为im加水印
$simage=$im;
$wcreatefun="imagecreatefrom".$winfo['type'];
if(!function_exists($wcreatefun))
$wcreatefun = 'imagecreatefromjpeg';
$wimage=$wcreatefun($water);
//设定图像的混色模式
imagealphablending($wimage, true);
switch (intval($position))
{
case 0: break;
//左上
case 1:
$posy=0;
$posx=0;
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
//右上
case 2:
$posy=0;
$posx=$sinfo[0]-$winfo[0];
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
//左下
case 3:
$posy=$sinfo[1]-$winfo[1];
$posx=0;
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
//右下
case 4:
$posy=$sinfo[1]-$winfo[1];
$posx=$sinfo[0]-$winfo[0];
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
//居中
case 5:
$posy=$sinfo[1]/2-$winfo[1]/2;
$posx=$sinfo[0]/2-$winfo[0]/2;
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
}
//end im加水印
ob_start();
imagegif($simage);
$content = ob_get_contents();
ob_end_clean();
$frames [ ] = $content;
$framed [ ] = $img['framedelay'];
}
$gif_maker = new gifencoder (
$frames,
$framed,
0,
2,
0, 0, 0,
"bin" //bin为二进制 url为地址
);
$image_rs = $gif_maker->getanimation ( );
//如果没有给出保存文件名，默认为原图像名
@unlink($source);
//保存图像
file_put_contents($source,$image_rs);
return true;
}
//建立图像
$screatefun="imagecreatefrom".$sinfo['type'];
if(!function_exists($screatefun))
$screatefun = 'imagecreatefromjpeg';
$simage=$screatefun($source);
$wcreatefun="imagecreatefrom".$winfo['type'];
if(!function_exists($wcreatefun))
$wcreatefun = 'imagecreatefromjpeg';
$wimage=$wcreatefun($water);
//设定图像的混色模式
imagealphablending($wimage, true);
switch (intval($position))
{
case 0: break;
//左上
case 1:
$posy=0;
$posx=0;
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
//右上
case 2:
$posy=0;
$posx=$sinfo[0]-$winfo[0];
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
//左下
case 3:
$posy=$sinfo[1]-$winfo[1];
$posx=0;
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
//右下
case 4:
$posy=$sinfo[1]-$winfo[1];
$posx=$sinfo[0]-$winfo[0];
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
//居中
case 5:
$posy=$sinfo[1]/2-$winfo[1]/2;
$posx=$sinfo[0]/2-$winfo[0]/2;
//生成混合图像
imagecopymerge($simage, $wimage, $posx, $posy, 0, 0, $winfo[0],$winfo[1],$alpha);
break;
}
//如果没有给出保存文件名，默认为原图像名
@unlink($source);
//保存图像
imagejpeg($simage,$source,100);
imagedestroy($simage);
}
}
if(!function_exists('image_type_to_extension'))
{
function image_type_to_extension($imagetype)
{
if(empty($imagetype))
return false;
switch($imagetype)
{
case imagetype_gif : return '.gif';
case imagetype_jpeg : return '.jpeg';
case imagetype_png : return '.png';
case imagetype_swf : return '.swf';
case imagetype_psd : return '.psd';
case imagetype_bmp : return '.bmp';
case imagetype_tiff_ii : return '.tiff';
case imagetype_tiff_mm : return '.tiff';
case imagetype_jpc : return '.jpc';
case imagetype_jp2 : return '.jp2';
case imagetype_jpx : return '.jpf';
case imagetype_jb2 : return '.jb2';
case imagetype_swc : return '.swc';
case imagetype_iff : return '.aiff';
case imagetype_wbmp : return '.wbmp';
case imagetype_xbm : return '.xbm';
default : return false;
}
}
}
?>
2.get_spec_img()调用图片类,然后再用下面的方法保存不同规格的图片并返回图片连接
//获取相应规格的图片地址
//gen=0:保持比例缩放，不剪裁,如高为0，则保证宽度按比例缩放 gen=1：保证长宽，剪裁
function get_spec_image($img_path,$width=0,$height=0,$gen=0,$is_preview=true)
{
if($width==0)
$new_path = $img_path;
else
{
$img_name = substr($img_path,0,-4);
$img_ext = substr($img_path,-3);
if($is_preview)
$new_path = $img_name."_".$width."x".$height.".jpg";
else
$new_path = $img_name."o_".$width."x".$height.".jpg";
if(!file_exists($new_path))
{
require_once "imagecls.php";
$imagec = new imagecls();
$thumb = $imagec->thumb($img_path,$width,$height,$gen,true,"",$is_preview);
if(app_conf("public_domain_root")!='')
{
$paths = pathinfo($new_path);
$path = str_replace("./","",$paths['dirname']);
$filename = $paths['basename'];
$pathwithoupublic = str_replace("public/","",$path);
$file_data = @file_get_contents($path.$file);
$img = @imagecreatefromstring($file_data);
if($img!==false)
{
$save_path = "public/".$path;
if(!is_dir($save_path))
{
@mk_dir($save_path);
}
@file_put_contents($save_path.$name,$file_data);
}
}
}
}
return $new_path;
}
3.使用方法:
//im:将店铺图片保存为3种规格:小图:48x48,中图120x120,大图200x200 $small_url=get_spec_image($data['image'],48,48,0); $<span id="result_box" class="short_text" lang="en"><span>middle_url</span></span>=get_spec_image($data['image'],120,120,0); $big_url=get_spec_image($data['image'],200,200,0);
希望本文所述对大家的php程序设计有所帮助。
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