欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

非常简单PHP缩略图生成程序源代码_PHP教程

程序员文章站 2022-04-12 08:13:00
...

$FILENAME="image_name";

// 生成图片的宽度
$RESIZEWIDTH=400;

// 生成图片的高度
$RESIZEHEIGHT=400;


function ResizeImage($im,$maxwidth,$maxheight,$name){
$width = imagesx($im);
$height = imagesy($im);
if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){
if($maxwidth && $width > $maxwidth){
$widthratio = $maxwidth/$width;
$RESIZEWIDTH=true;
}
if($maxheight && $height > $maxheight){
$heightratio = $maxheight/$height;
$RESIZEHEIGHT=true;
}
if($RESIZEWIDTH && $RESIZEHEIGHT){
if($widthratio $ratio = $widthratio;
}else{
$ratio = $heightratio;
}
}elseif($RESIZEWIDTH){
$ratio = $widthratio;
}elseif($RESIZEHEIGHT){
$ratio = $heightratio;
}
$newwidth = $width * $ratio;
$newheight = $height * $ratio;
if(function_exists("imagecopyresampled")){
www.phperz.com


$newim = imagecreatetruecolor($newwidth, $newheight);
imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
}else{
$newim = imagecreate($newwidth, $newheight);
imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
}
ImageJpeg ($newim,$name . ".jpg");
ImageDestroy ($newim);
}else{
ImageJpeg ($im,$name . ".jpg");
}
}

if($_FILES[image][size]){
if($_FILES[image][type] == "image/pjpeg"){
$im = imagecreatefromjpeg($_FILES[image][tmp_name]);
}elseif($_FILES[image][type] == "image/x-png"){
$im = imagecreatefrompng($_FILES[image][tmp_name]);
}elseif($_FILES[image][type] == "image/gif"){
$im = imagecreatefromgif($_FILES[image][tmp_name]);
}
if($im){
if(file_exists("$FILENAME.jpg")){
unlink("$FILENAME.jpg");
}
ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$FILENAME); www~phperz~com
ImageDestroy ($im);
}
}

?>

非常简单PHP缩略图生成程序源代码_PHP教程">