Customizable PHP thumbnail generation program (requires GD library support)

Thumbnail image

The classic PHP thumbnail generation program, based on the GD library, can specify the build path and build target of the wide-high details

Usage: In a PHP environment that supports the GD library, save the following code as a resize.php test

?

$FILENAME="Image_name";

//Generate the width of the picture
$RESIZEWIDTH= -;

//Build the height of the picture
$RESIZEHEIGHT= -;

//Build the path of the picture
$uploaddir="C:/winnt/temp";

functionResizeimage($im,$maxwidth,$maxheight,$name){
Global$uploaddir;
$width= Imagesx($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,$uploaddir.$name. ". jpg");
Imagedestroy($newim);
}else{
imagejpeg($im,$uploaddir.$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,$FILENAME);
Imagedestroy($im);
}
}
?>

?Echo ($FILENAME.". jpg?reload=".Rand(0,999999)); ?>"><br><br>

<form enctype= "Multipart/form-data" method= "POST" >
<br>
<input type= "file" name= "image" Size= "a" value= "browse" ><p>
<input type= "Submit" value= "Upload picture" >
</form>

</body>