は... resize.phpに以下のコードを保存
resize.php
<?php
/**
* Image Resizer.
* @author : Harish Chauhan
* @copyright : Freeware
* About :This PHP script will resize the given image and can show on the fly or save as image file.
*
*/
define("HAR_AUTO_NAME",1);
Class RESIZEIMAGE
{
var $imgFile="";
var $imgWidth=0;
var $imgHeight=0;
var $imgType="";
var $imgAttr="";
var $type=NULL;
var $_img=NULL;
var $_error="";
/**
* Constructor
*
* @param [String $imgFile] Image File Name
* @return RESIZEIMAGE (Class Object)
*/
function RESIZEIMAGE($imgFile="")
{
if (!function_exists("imagecreate"))
{
$this->_error="Error: GD Library is not available.";
return false;
}
$this->type=Array(1 => 'GIF', 2 => 'JPG', 3 => 'PNG', 4 => 'SWF', 5 => 'PSD', 6 => 'BMP', 7 => 'TIFF', 8 => 'TIFF', 9 => 'JPC', 10 => 'JP2', 11 => 'JPX', 12 => 'JB2', 13 => 'SWC', 14 => 'IFF', 15 => 'WBMP', 16 => 'XBM');
if(!empty($imgFile))
$this->setImage($imgFile);
}
/**
* Error occured while resizing the image.
*
* @return String
*/
function error()
{
return $this->_error;
}
/**
* Set image file name
*
* @param String $imgFile
* @return void
*/
function setImage($imgFile)
{
$this->imgFile=$imgFile;
return $this->_createImage();
}
/**
*
* @return void
*/
function close()
{
return @imagedestroy($this->_img);
}
/**
* Resize a image to given width and height and keep it's current width and height ratio
*
* @param Number $imgwidth
* @param Numnber $imgheight
* @param String $newfile
*/
function resize_limitwh($imgwidth,$imgheight,$newfile=NULL)
{
$image_per = 100;
list($width, $height, $type, $attr) = @getimagesize($this->imgFile);
if($width > $imgwidth && $imgwidth > 0)
$image_per = (double)(($imgwidth * 100)/$width);
if(floor(($height * $image_per)/100)>$imgheight && $imgheight > 0)
$image_per = (double)(($imgheight * 100)/$height);
$this->resize_percentage($image_per,$newfile);
}
/**
* Resize an image to given percentage.
*
* @param Number $percent
* @param String $newfile
* @return Boolean
*/
function resize_percentage($percent=100,$newfile=NULL)
{
$newWidth=($this->imgWidth*$percent)/100;
$newHeight=($this->imgHeight*$percent)/100;
return $this->resize($newWidth,$newHeight,$newfile);
}
/**
* Resize an image to given X and Y percentage.
*
* @param Number $xpercent
* @param Number $ypercent
* @param String $newfile
* @return Boolean
*/
function resize_xypercentage($xpercent=100,$ypercent=100,$newfile=NULL)
{
$newWidth=($this->imgWidth*$xpercent)/100;
$newHeight=($this->imgHeight*$ypercent)/100;
return $this->resize($newWidth,$newHeight,$newfile);
}
/**
* Resize an image to given width and height
*
* @param Number $width
* @param Number $height
* @param String $newfile
* @return Boolean
*/
function resize($width,$height,$newfile=NULL)
{
if(empty($this->imgFile))
{
$this->_error="File name is not initialised.";
return false;
}
if($this->imgWidth<=0 || $this->imgHeight<=0)
{
$this->_error="Could not resize given image";
return false;
}
if($width<=0)
$width=$this->imgWidth;
if($height<=0)
$height=$this->imgHeight;
return $this->_resize($width,$height,$newfile);
}
/**
* Get the image attributes
* @access Private
*
*/
function _getImageInfo()
{
@list($this->imgWidth,$this->imgHeight,$type,$this->imgAttr)[email protected]($this->imgFile);
$this->imgType=$this->type[$type];
}
/**
* Create the image resource
* @access Private
* @return Boolean
*/
function _createImage()
{
$this->_getImageInfo($this->imgFile);
if($this->imgType=='GIF')
{
$this->[email protected]($this->imgFile);
}
elseif($this->imgType=='JPG')
{
$this->[email protected]($this->imgFile);
}
elseif($this->imgType=='PNG')
{
$this->[email protected]($this->imgFile);
}
if(!$this->_img || [email protected]_resource($this->_img))
{
$this->_error="Error loading ".$this->imgFile;
return false;
}
return true;
}
/**
* Function is used to resize the image
*
* @access Private
* @param Number $width
* @param Number $height
* @param String $newfile
* @return Boolean
*/
function _resize($width,$height,$newfile=NULL)
{
if (!function_exists("imagecreate"))
{
$this->_error="Error: GD Library is not available.";
return false;
}
[email protected]($width,$height);
//imagecolortransparent($newimg, imagecolorat($newimg, 0, 0));
if($this->imgType=='GIF' || $this->imgType=='PNG')
{
/** Code to keep transparency of image **/
$colorcount = imagecolorstotal($this->_img);
if ($colorcount == 0) $colorcount = 256;
imagetruecolortopalette($newimg,true,$colorcount);
imagepalettecopy($newimg,$this->_img);
$transparentcolor = imagecolortransparent($this->_img);
imagefill($newimg,0,0,$transparentcolor);
imagecolortransparent($newimg,$transparentcolor);
}
@imagecopyresampled ($newimg, $this->_img, 0,0,0,0, $width, $height, $this->imgWidth,$this->imgHeight);
if($newfile===HAR_AUTO_NAME)
{
if(@preg_match("/\..*+$/",@basename($this->imgFile),$matches))
[email protected]_replace($this->imgFile,"_har",[email protected]($matches[0]),0);
}
elseif(!empty($newfile))
{
if([email protected]_match("/\..*+$/",@basename($newfile)))
{
if(@preg_match("/\..*+$/",@basename($this->imgFile),$matches))
$newfile=$newfile.$matches[0];
}
}
if($this->imgType=='GIF')
{
if(!empty($newfile))
@imagegif($newimg,$newfile);
else
{
@header("Content-type: image/gif");
@imagegif($newimg);
}
}
elseif($this->imgType=='JPG')
{
if(!empty($newfile))
@imagejpeg($newimg,$newfile);
else
{
@header("Content-type: image/jpeg");
@imagejpeg($newimg);
}
}
elseif($this->imgType=='PNG')
{
if(!empty($newfile))
@imagepng($newimg,$newfile);
else
{
@header("Content-type: image/png");
@imagepng($newimg);
}
}
@imagedestroy($newimg);
}
}
?>
は、コードと使用中のファイルresize.phpを含めますイメージのサムネイルをサイズ変更または作成するためのコード
include "resize.php";
$path = "your image path";
$newname = "your image name to be resized";
$rimg=new RESIZEIMAGE("$path/$newname");
$width = $rimg->imgWidth;
if($width > 800){
$per = round(800/$width*100);
$rimg->resize_percentage($per,"$path/$newname"); //resize image
}
$rimg->resize(100,100,"$path/$newname"); //create thumbnail for an image
$rimg->close();
はい。このサイトで「サムネイルの作成」を検索しましたか？それはよくカバーされたトピックです。 – deceze