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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