php图片长宽处理,PHP重置JPG图片尺寸的函数
<?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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