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如何利用php把上传的图片压缩
?php
// The file
$filename = 'test.jpg';
$percent = 0.5;
// Content type
header('Content-Type: image/jpeg');
// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;
// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
// Output
imagejpeg($image_p, null, 100);
?
php 怎么压缩图片的大小
php 压缩图片的大小：
?php
$im = imagecreatefromjpeg('D:phpplace.jpeg');
resizeImage($im,,,'xinde','.jpg');
function resizeImage($im,$maxwidth,$maxheight,$name,$filetype)
{
$pic_width = imagesx($im);
$pic_height = imagesy($im);
echo "start-----------------" ;
if(($maxwidth $pic_width $maxwidth) ($maxheight $pic_height $maxheight))
{
if($maxwidth $pic_width$maxwidth)
{
$widthratio = $maxwidth/$pic_width;
$resizewidth_tag = true;
}
if($maxheight $pic_height$maxheight)
{
$heightratio = $maxheight/$pic_height;
$resizeheight_tag = true;
}
if($resizewidth_tag $resizeheight_tag)
{
if($widthratio$heightratio)
$ratio = $widthratio;
else
$ratio = $heightratio;
}
if($resizewidth_tag !$resizeheight_tag)
$ratio = $widthratio;
if($resizeheight_tag !$resizewidth_tag)
$ratio = $heightratio;
$newwidth = $pic_width * $ratio;
$newheight = $pic_height * $ratio;
if(function_exists("imagecopyresampled"))
{
$newim = imagecreatetruecolor($newwidth,$newheight);
imagecopyresampled($newim,$im,,,,,$newwidth,$newheight,$pic_width,$pic_height);
}
else
{
$newim = imagecreate($newwidth,$newheight);
imagecopyresized($newim,$im,,,,,$newwidth,$newheight,$pic_width,$pic_height);
}
$name = $name.$filetype;
imagejpeg($newim,$name);
imagedestroy($newim);
}
else
{
$name = $name.$filetype;
imagejpeg($im,$name);
}
}
PHP在线解压ZIP文件
解压步骤：
第一步、把unzip.php或upzid.php（2选1即可）通过 FTP上传到压缩包所在的文件夹；
第二步、使用“域名/unzip.php或upzid.php?file=压缩文件名称”访问解压，如 ;
此源码适合php环境的zip压缩包在线解压。
注意：解压完成后请务必删除站点目录下的unzip.php和upzid.php文件，以免被其他人利用！
