PHP generates thumbnails more capable of encountering point-related issues

PHP generated thumbnails more capable, encountered some problems, ask you
Want to implement a upload image and generate thumbnails of the function, from the Internet to find the code, also succeeded.
To generate two photos at a time-a large thumbnail, a small thumbnail, the result is the following code:

notice:undefined variable:resizewidth in D:\WWW\qiangyuan\up.php on line 17
notice:undefined variable:resizewidth in D:\WWW\qiangyuan\up.php on line 23



The source program code is as follows:

//****************************************
Generate Thumbnails ========================================

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 < $heightratio) {
$ratio = $widthratio;
}else{
$ratio = $heightratio;
}
}elseif ($RESIZEWIDTH) {
$ratio = $widthratio;
}elseif ($RESIZEHEIGHT) {
$ratio = $heightratio;
}
$newwidth = $width * $ratio;
$newheight = $height * $ratio;
if (function_exists ("imagecopyresampled")) {
$newim = Imagecreatetruecolor ($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");
}
}

$FILENAME = "product/min/". Date ("Ymdhis"); Small picture file name
$RESIZEWIDTH = 150; Create the width of the picture
$RESIZEHEIGHT = 113; Height of the resulting picture



if (isset ($_files[' image ' [' size '])) {
if ($_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, $FILENAME); Generate a small image
Resizeimage ($im, 600,450, "product/max/". Date ("Ymdhis")); Generate a larger image
Imagedestroy ($im);
}
}

//****************************************
?>












------Solution--------------------
Assigning initial values to $resizewidth and $RESIZEHEIGHT at the entrance of a function

function Resizeimage ($im, $maxwidth, $maxheight, $name) {
$RESIZEWIDTH = $RESIZEHEIGHT = false;
....

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