- 浏览: 63313 次
- 性别:
- 来自: 深圳
最新评论
-
rjzou200611:
只是sock文件不存在,还是可以通过网络的方式访问。
mysql.sock文件被删除后 -
tss0823:
好文章,赞,,通过楼主的文章我解决了我的问题,非常感谢!
mysql.sock文件被删除后 -
masuweng:
写的不错。
存储过程的三个参数区别in,out,inout -
悲剧了:
...
ajax原理剖析 -
yiminghe:
原理:id命名标签的DOM节点,ie为了兼容会引入到全局空间的 ...
ie和ff的js区别
最近在网上找了些资料,然后稍微修改重新封装成了一个可以直接调用的公共函数
<?php define ('IMG_FILTER_CACHE_SIZE', 250); // number of files to store before clearing cache define ('IMG_FILTER_CACHE_CLEAR', 5); // maximum number of files to delete on each cache clear define ('IMG_FILTER_VERSION', '1.09'); // version number (to force a cache refresh /** * 缩小图片的处理函数,当$width和$height都为零时,函数默认为100x100的图片 * 使用示例1:minifyPicture(UPLOAD_PIC_DIR.$main_imagename, 0, 0, 0, 100); * 这个语句会调用函数将目标图片等比例转换为100x100的图片,图片质量设为100(即最高质量) * 使用示例2:minifyPicture(UPLOAD_PIC_DIR.$main_imagename, 150, 150, 0, 50); * 这个语句会调用函数将目标图片等比例转换为150x150的图片,图片质量设为50 * @param string $src, 文件的绝对路径 * @param int $width, 缩小后的图片宽 * @param int $height, 缩小后的图片高 * @param int $zoom_crop, 是否等比例缩放,为0时按等比例缩小,为1则只取图片一部分 * @param int $quality, 缩小图片的画面质量,取值在(0,100],100为画面最高质量 * @return string,操作成功,返回空字符串,否则返回错误提示信息 */ function minifyPicture($src, $width, $height, $zoom_crop, $quality){ $imageFilters = array( "1" => array("IMG_FILTER_NEGATE", 0), "2" => array("IMG_FILTER_GRAYSCALE", 0), "3" => array("IMG_FILTER_BRIGHTNESS", 1), "4" => array("IMG_FILTER_CONTRAST", 1), "5" => array("IMG_FILTER_COLORIZE", 4), "6" => array("IMG_FILTER_EDGEDETECT", 0), "7" => array("IMG_FILTER_EMBOSS", 0), "8" => array("IMG_FILTER_GAUSSIAN_BLUR", 0), "9" => array("IMG_FILTER_SELECTIVE_BLUR", 0), "10" => array("IMG_FILTER_MEAN_REMOVAL", 0), "11" => array("IMG_FILTER_SMOOTH", 0), ); if($src == "" || strlen($src) <= 3) return "no image specified"; // $orifilesize = filesize($src); // if($orifilesize <= 1024*500) // return; $picinfo = pathinfo($src); $picname = $picinfo["basename"]; // set path to cache directory (default is ./cache) // this can be changed to a different location $cache_dir = $picinfo['dirname']; // last modified time (for caching) $lastModified = filemtime($src); // // get properties $new_width = preg_replace("/[^0-9]+/", "", $width); $new_height = preg_replace("/[^0-9]+/", "", $height); $zoom_crop = preg_replace("/[^0-9]+/", "", $zoom_crop); $quality = preg_replace("/[^0-9]+/", "", $quality); $filters = ""; if ($new_width == 0 && $new_height == 0) { $new_width = 100; $new_height = 100; } // get mime type of src $mime_type = IMG_FILTER_mime_type($src); // check to see if this image is in the cache already IMG_FILTER_check_cache( $cache_dir ); // if not in cache then clear some space and generate a new file //cleanCache(); ini_set('memory_limit', "50M"); // make sure that the src is gif/jpg/png if(!IMG_FILTER_valid_src_mime_type($mime_type)) { return "Invalid src mime type: " .$mime_type; } // check to see if GD function exist if(!function_exists('imagecreatetruecolor')) { return "GD Library Error: imagecreatetruecolor does not exist"; } if(strlen($src) && file_exists($src)) { // open the existing image $image = IMG_FILTER_open_image($mime_type, $src); if($image === false) { return 'Unable to open image : ' . $src; } // Get original width and height $width = imagesx($image); $height = imagesy($image); // don't allow new width or height to be greater than the original if( $new_width > $width ) { $new_width = $width; } if( $new_height > $height ) { $new_height = $height; } // // generate new w/h if not provided // if( $new_width && !$new_height ) { // // $new_height = $height * ( $new_width / $width ); // // } elseif($new_height && !$new_width) { // // $new_width = $width * ( $new_height / $height ); // // } elseif(!$new_width && !$new_height) { // // $new_width = $width; // $new_height = $height; // // } //assign the start position on the canvas if( $height > $width ){ $dst_height = $new_height; $dst_width = $dst_height*($width/$height); $dst_x = ( $new_width - $dst_width )/2; $dst_y = 0; }elseif( $height < $width ){ $dst_width = $new_width; $dst_height = $dst_width*($height/$width); $dst_x = 0; $dst_y = ( $new_height - $dst_height)/2; }elseif( $height == $width ){ $dst_width = $new_width; $dst_height = $new_height; $dst_x = 0; $dst_y = 0; } // create a new true color image $canvas = imagecreatetruecolor( $new_width, $new_height ); imagealphablending($canvas, false); // Create a new transparent color for image $color = imagecolorallocatealpha($canvas, 250, 250, 250, 127); // Completely fill the background of the new image with allocated color. imagefill($canvas, 0, 0, $color); // Restore transparency blending imagesavealpha($canvas, true); if( $zoom_crop ) { $src_x = $src_y = 0; $src_w = $width; $src_h = $height; $cmp_x = $width / $new_width; $cmp_y = $height / $new_height; // calculate x or y coordinate and width or height of source if ( $cmp_x > $cmp_y ) { $src_w = round( ( $width / $cmp_x * $cmp_y ) ); $src_x = round( ( $width - ( $width / $cmp_x * $cmp_y ) ) / 2 ); } elseif ( $cmp_y > $cmp_x ) { $src_h = round( ( $height / $cmp_y * $cmp_x ) ); $src_y = round( ( $height - ( $height / $cmp_y * $cmp_x ) ) / 2 ); } imagecopyresampled( $canvas, $image, 0, 0, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h ); } else { // copy and resize part of an image with resampling imagecopyresampled( $canvas, $image, $dst_x, $dst_y, 0, 0, $dst_width, $dst_height, $width, $height ); } if ($filters != "") { // apply filters to image $filterList = explode("|", $filters); foreach($filterList as $fl) { $filterSettings = explode(",", $fl); if(isset($imageFilters[$filterSettings[0]])) { for($i = 0; $i < 4; $i ++) { if(!isset($filterSettings[$i])) { $filterSettings[$i] = null; } } switch($imageFilters[$filterSettings[0]][1]) { case 1: imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1]); break; case 2: imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2]); break; case 3: imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3]); break; default: imagefilter($canvas, $imageFilters[$filterSettings[0]][0]); break; } } } } // output image to browser based on mime type IMG_FILTER_show_image($mime_type, $canvas, $cache_dir, $quality, $picname); // remove image from memory //imagedestroy($canvas); return ""; } else { if(strlen($src)) { return "image " . $src . " not found"; } else { return "no source specified"; } } } //======================================================================================================= /** * 以下是一些辅助处理函数 */ function IMG_FILTER_show_image($mime_type, $image_resized, $cache_dir, $quality, $picname) { // check to see if we can write to the cache directory $is_writable = 0; $cache_file_name = $cache_dir . '/' . $picname; if(touch($cache_file_name)) { // give 666 permissions so that the developer // can overwrite web server user chmod($cache_file_name, 0666); $is_writable = 1; } else { $cache_file_name = NULL; header('Content-type: ' . $mime_type); } //$quality = floor($quality * 0.09); imagejpeg($image_resized, $cache_file_name, $quality); if($is_writable) { //IMG_FILTER_show_cache_file($cache_dir, $mime_type, $picname); } imagedestroy($image_resized); } /** * */ function IMG_FILTER_open_image($mime_type, $src) { if(stristr($mime_type, 'gif')) { $image = imagecreatefromgif($src); } elseif(stristr($mime_type, 'jpeg')) { @ini_set('gd.jpeg_ignore_warning', 1); $image = imagecreatefromjpeg($src); } elseif( stristr($mime_type, 'png')) { $image = imagecreatefrompng($src); } return $image; } /** * clean out old files from the cache * you can change the number of files to store and to delete per loop in the defines at the top of the code */ function IMG_FILTER_cleanCache() { $files = glob("cache/*", GLOB_BRACE); $yesterday = time() - (24 * 60 * 60); if (count($files) > 0) { usort($files, "filemtime_compare"); $i = 0; if (count($files) > IMG_FILTER_CACHE_SIZE) { foreach ($files as $file) { $i ++; if ($i >= IMG_FILTER_CACHE_CLEAR) { return; } if (filemtime($file) > $yesterday) { return; } unlink($file); } } } } /** * compare the file time of two files */ function IMG_FILTER_filemtime_compare($a, $b) { return filemtime($a) - filemtime($b); } /** * determine the file mime type */ function IMG_FILTER_mime_type($file) { if (stristr(PHP_OS, 'WIN')) { $os = 'WIN'; } else { $os = PHP_OS; } $mime_type = ''; if (function_exists('mime_content_type')) { $mime_type = mime_content_type($file); } // use PECL fileinfo to determine mime type if (!IMG_FILTER_valid_src_mime_type($mime_type)) { if (function_exists('finfo_open')) { $finfo = finfo_open(FILEINFO_MIME); $mime_type = finfo_file($finfo, $file); finfo_close($finfo); } } // try to determine mime type by using unix file command // this should not be executed on windows if (!IMG_FILTER_valid_src_mime_type($mime_type) && $os != "WIN") { if (preg_match("/FREEBSD|LINUX/", $os)) { $mime_type = trim(@shell_exec('file -bi "' . $file . '"')); } } // use file's extension to determine mime type if (!IMG_FILTER_valid_src_mime_type($mime_type)) { // set defaults $mime_type = 'image/png'; // file details $fileDetails = pathinfo($file); $ext = strtolower($fileDetails["extension"]); // mime types $types = array( 'jpg' => 'image/jpeg', 'jpeg' => 'image/jpeg', 'png' => 'image/png', 'gif' => 'image/gif' ); if (strlen($ext) && strlen($types[$ext])) { $mime_type = $types[$ext]; } } return $mime_type; } /** * */ function IMG_FILTER_valid_src_mime_type($mime_type) { if (preg_match("/jpg|jpeg|gif|png/i", $mime_type)) { return true; } return false; } /** * */ function IMG_FILTER_check_cache($cache_dir) { // make sure cache dir exists if (!file_exists($cache_dir)) { // give 777 permissions so that developer can overwrite // files created by web server user mkdir($cache_dir); chmod($cache_dir, 0777); } chmod($cache_dir, 0777); //show_cache_file($cache_dir, $mime_type, $lastModified); } /** * */ function IMG_FILTER_show_cache_file($cache_dir,$mime_type,$picname) { $cache_file = $cache_dir . '/' . $picname; if (file_exists($cache_file)) { $gmdate_mod = gmdate("D, d M Y H:i:s", filemtime($cache_file)); if(! strstr($gmdate_mod, "GMT")) { $gmdate_mod .= " GMT"; } if (isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])) { // check for updates $if_modified_since = preg_replace("/;.*$/", "", $_SERVER["HTTP_IF_MODIFIED_SINCE"]); if ($if_modified_since == $gmdate_mod) { header("HTTP/1.1 304 Not Modified"); exit; } } $fileSize = filesize($cache_file); // send headers then display image header("Content-Type: image/png"); header("Accept-Ranges: bytes"); header("Last-Modified: " . $gmdate_mod); header("Content-Length: " . $fileSize); header("Cache-Control: max-age=9999, must-revalidate"); header("Expires: " . $gmdate_mod); readfile($cache_file); exit; } } /** * check to if the url is valid or not */ function IMG_FILTER_valid_extension ($ext) { if (preg_match("/jpg|jpeg|png|gif/i", $ext)) { return TRUE; } else { return FALSE; } } ?>
相关推荐
php gd等比例缩放压缩图片函数_.docx
主要为大家详细介绍了php gd等比例缩放压缩图片函数,文章末尾为大家分享了php and gd 函数参考表,感兴趣的小伙伴们可以参考一下
本文实例讲述了PHP基于GD库实现的生成图片缩略图函数。分享给大家供大家参考,具体如下: <?php /** * 生成缩略图函数(支持图片格式:gif、jpeg、png和bmp) * @author ruxing.li * @param string $src 源...
有两种改变图像大小的方法.(1):ImageCopyResized() 函数在所有GD版本中有效,但其缩放图像的算法比较粗糙.(2):ImageCopyResampled(),其像素插值算法得到的图像边缘比较平滑.质量较好(但该函数的速度比 ...
PHP生成缩略图 一、开发环境 1、环境搭建:Windows 8+Apache 2.4.18+MySQL 5.7.11+PHP 7.1.0 。 2、文本编辑器:Sublime Text3。 二、主要技术 本实验主要使用PHP GD库的图片缩放、裁剪等函数完成。
GD5F1GQ4UAYIG SPI NAND FLASH 文档描述详细coder: 通过 CreateVideoDecoder 函数创建的视频解码器指针; nScaleDownRatio: 图像缩放比例因子。 返回值 0: 表示成功;-1: 失败
在web应用中,经常使用的图片格式有GIF、JPEG和PNG中的一种或几种,当然GD库也可以处理其他格式的图片,但都很少用到。所以安装GD库时,至少安装GIF、JPEG或PNG三种格式中的一种。 在前面介绍的画布管理中,使用...
一个php生成三种缩略图的函数类,把大图缩略到...把大图缩略到缩略图指定的范围内,不留白(原图会居中缩放,把超出的部分裁剪掉);把大图缩略到缩略图指定的范围内,不留白(原图会剪切掉不符合比例的右边和下边)。
1、利用php gd库的函数绘制3D扇形统计图 <?phpheader(content-type,text/html;charset=utf-8);/*扇形统计图*/$image = imagecreatetruecolor(100, 100); /*创建画布*//*设置画布需要的颜色*/$white = ...
一个简单但功能比较完善的自动生成缩略图的函数,可以按需要对图片进行缩放、裁切、锁定宽或高、使用空白填充 以下为源码,比较简单,相信很容易看明白,记得打开 GD 库的支持哦: <?php /** * 生成缩略图 * @...
1、利用php gd库的函数绘制3D扇形统计图 <?php header(content-type,text/html;charset=utf-8); /*扇形统计图*/ $image = imagecreatetruecolor(100, 100); /*创建画布*/ /*设置画布需要的颜色*/ $white =...
ImageCopyResized( )函数在所有GD版本中有效,但其缩放图像的算法比较粗糙,可能会导致图像边缘的锯齿。GD 2.x中新增了一个ImageCopyResampled( )函数,其像素插值算法得到的图像边缘比较平滑(但该函数的速度比...
采用 WordPress 自带函数进行裁剪(默认支持 GD 和 Imagick 两个库,有一个即可正常裁剪) 支持广告位,可以选择在线上传广告图片或者自定义广告代码;在开启响应式布局的情况下可以自定义广告在哪些平台上显示(PC ...
5. 原上传图片最大允许的边长900像素,超过会自动等比缩放,修改为不缩放。 6. 编辑器 撤销 次数增加到200次。 7. 编辑器 自动排版 可自动保存个人偏好。 8. 添加/修改文章界面增加“关键词搜索相关文章列表”插入...
echo "你的GD库不能使用GIF格式的图片,请使用Jpeg或PNG格式!返回"; exit(); }生成缩略图函数(支持图片格式:gif、jpeg、png和bmp) * @author ruxing.li * @param string $src 源图片路径 * @...
2、支持上传图片添加水印,图片自动缩放,生成缩略图等。 JBLOGv1.5更新列表----------------------------------- 功能修改: 1、增加文章自动摘要功能和没有摘要时全文输出开关。 2、增加文章别名是否重复判断。 3...