<?php

/**

* 重置Jpg圖片尺寸

*

* @param string $path

* @param string $filename 源文件名

* @param int $maxwidth

* @param int $maxheight

* @param string $newname 新文件名

*/

function reSizeJpg($path, $filename, $maxwidth, $maxheight, $newname)

{

$jpg = imagecreatefromjpeg($path.'/'.$filename);

if ($jpg) {

$width = imagesx($jpg);

$height = imagesy($jpg);

} else {

return false;

}

if (($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)) {

if ($maxwidth && $width > $maxwidth) {

$widthratio = $maxwidth / $width;

$resize_width = true;

}

if ($maxheight && $height > $maxheight) {

$heightratio = $maxheight / $height;

$resize_height = true;

}

if ($resize_width && $resize_height) {

if ($widthratio < $heightratio) {

$ratio = $widthratio;

} else {

$ratio = $heightratio;

}

} elseif ($resize_width) {

$ratio = $widthratio;

} elseif ($resize_height) {

$ratio = $heightratio;

}

$newwidth = $width * $ratio;

$newheight = $height * $ratio;

if (function_exists("imagecopyresampled")) {

$newim = imagecreatetruecolor($newwidth, $newheight);

imagecopyresampled($newim, $jpg, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

} else {

$newim = imagecreate($newwidth, $newheight);

imagecopyresized($newim, $jpg, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

}

imagejpeg($newim, $path.'/'.$newname);

imagedestroy($newim);

} else {

imagejpeg($jpg, $path.'/'.$newname);

}

imagedestroy($jpg);

return true;

}

?>

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