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?php/*+———————————————————————–+*//*+ jpg,jif,png 图片 等 比例 压缩 +*//*+———————————————————————–+*/class RarImag{/** * 得到等 比例 缩放的长宽 *
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<?php/*+-----------------------------------------------------------------------+*//*+ jpg,jif,png图片等比例压缩 +*//*+-----------------------------------------------------------------------+*/class RarImag{ /** * 得到等比例缩放的长宽 */ function getNewSize($maxWidth, $maxHeight, $srcWidth, $srcHeight) { if($srcWidth > $maxWidth) { $maxWidth = $maxWidth; if($srcHeight > $maxHeight) { $maxHeight = ($srcHeight/$srcHeight) * $maxWidth; } else {$maxHeight = $srcHeight; } return array(width => $maxWidth,height => $maxHeight); }if($srcHeight > $maxHeight) { $maxHeight = $maxHeight; if($srcWidth > $maxWidth) {$maxWidth = ($srcWidth/$srcHeight) * $maxHeight; } else {$maxWidth = $srcWidth; } return array(width => $srcWidth,height => $maxHeight); }return array(width => $srcWidth,height => $srcHeight);
} /** * 等比例生成缩略图 * * @param String $srcFile 原始文件路径 * @param String $dstFile 目标文件路径 * @param Integer $maxWidth 生成的目标文件的最大宽度 * @param Integer $maxHeight 生成的目标文件的最大高度 * @return Boolean 生成成功则返回true，否则返回false */ function makeThumb($srcFile, $dstFile, $maxWidth, $maxHeight) { if ($size = getimagesize($srcFile)) { $srcWidth = $size[0]; $srcHeight = $size[1]; $mime = $size[mime];
switch ($mime) { case image/jpeg;$isJpeg = true;break; case image/gif;$isGif = true;break; case image/png;$isPng = true;break; default:return false;break; } //header("Content-type:$mime"); $arr = $this->getNewSize($maxWidth, $maxHeight, $srcWidth, $srcHeight); $thumbWidth = $arr[width]; $thumbHeight = $arr[height]; if (isset($isJpeg) && $isJpeg) { $dstThumbPic = imagecreatetruecolor($thumbWidth, $thumbHeight); $srcPic = imagecreatefromjpeg($srcFile); imagecopyresampled($dstThumbPic, $srcPic, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $srcWidth, $srcHeight); imagejpeg($dstThumbPic, $dstFile, 100); imagedestroy($dstThumbPic); imagedestroy($srcPic); return true; } elseif (isset($isGif) && $isGif) { $dstThumbPic = imagecreatetruecolor($thumbWidth, $thumbHeight); //创建透明画布 imagealphablending($dstThumbPic, true); imagesavealpha($dstThumbPic, true); $trans_colour = imagecolorallocatealpha($dstThumbPic, 0, 0, 0, 127); imagefill($dstThumbPic, 0, 0, $trans_colour);
$srcPic = imagecreatefromgif($srcFile); imagecopyresampled($dstThumbPic, $srcPic, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $srcWidth, $srcHeight); imagegif($dstThumbPic, $dstFile); imagedestroy($dstThumbPic); imagedestroy($srcPic); return true; } elseif (isset($isPng) && $isPng) { $dstThumbPic = imagecreatetruecolor($thumbWidth, $thumbHeight); //创建透明画布 imagealphablending($dstThumbPic, true); imagesavealpha($dstThumbPic, true); $trans_colour = imagecolorallocatealpha($dstThumbPic, 0, 0, 0, 127); imagefill($dstThumbPic, 0, 0, $trans_colour);
$srcPic = imagecreatefrompng($srcFile); imagecopyresampled($dstThumbPic, $srcPic, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $srcWidth, $srcHeight); imagepng($dstThumbPic, $dstFile); imagedestroy($dstThumbPic); imagedestroy($srcPic); return true; } else { return false; } } else { return false; } }}?>
