这篇文章主要介绍了php将图片保存为不同尺寸图片的图片类,涉及php图片操作的保存、复制、缩略图等常用技巧,并封装成一个类文件以便于调用,非常具有实用价值,需要的朋友可以参考下
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：
/**
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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