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Resizing

imagescale($r,$i1[,$i2=-1[,$i3=IMG_ BILINAER_FIXED]]) scales an image $r using the new width $i1 and new height $i2. A new image resource is returned. $i3 can be IMG_NEAREST_NEIGHBOUR, IMG_BILINEAR_FIXED, IMG_BICUBIC, IMG_BICUBIC_FIXED. 

<?php

$rs=imagecreatefromjpeg("testing.jpg");
$rd=imagescale($rs,100,100);
imagejpeg($rd,"testing5.jpg");

?>