$file = 'images.jpg';

$save = 'new.jpg';

list($width, $height) = getimagesize($file) ;

$modwidth = 100;

$modheight = 100;

$tn = imagecreatetruecolor($modwidth, $modheight) ;

$image = imagecreatefromjpeg($file) ;

imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;

imagejpeg($tn, $save, 100);

echo("Image created and saved successfully.");

After running the program you will get the following output

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