Customizable PHP thumbnail generation program (requires GD library support)_PHP tutorial

The classic PHP thumbnail generation program, based on the GD library, can specify the generation path and the width and height details of the generation target. Instructions for use: In a PHP environment that supports the GD library, save the following code as resize.php for testing


Classic PHP thumbnail generation program, based on GD library, can specify the generation path and width and height details of the generation target

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

Copy code The code is as follows:

$FILENAME="image_name";

// The width of the generated image
$RESIZEWIDTH=400;

// The height of the generated image
$RESIZEHEIGHT=400;

//The path to generate the image
$uploaddir="c:/winnt/temp";

function ResizeImage($im,$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 $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);
}
}
?>

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