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Filename : testing.php
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<?php
if(isset($_POST["submit"])) {
if(is_array($_FILES)) {
$file = $_FILES['myImage']['tmp_name']; 
$source_properties = getimagesize($file);
$image_type = $source_properties[2]; 
if( $image_type == IMAGETYPE_JPEG ) {   
$image_resource_id = imagecreatefromjpeg($file);  
$target_layer = fn_resize($image_resource_id,$source_properties[0],$source_properties[1]);
imagejpeg($target_layer,$_FILES['myImage']['name'] . "_thump.jpg");
}
elseif( $image_type == IMAGETYPE_GIF )  {  
$image_resource_id = imagecreatefromgif($file);
$target_layer = fn_resize($image_resource_id,$source_properties[0],$source_properties[1]);
imagegif($target_layer,$_FILES['myImage']['name'] . "_thump.gif");
}
elseif( $image_type == IMAGETYPE_PNG ) {
$image_resource_id = imagecreatefrompng($file); 
$target_layer = fn_resize($image_resource_id,$source_properties[0],$source_properties[1]);
imagepng($target_layer,$_FILES['myImage']['name'] . "_thump.png");
}
}
}
function fn_resize($image_resource_id,$width,$height) {
$target_width =200;
$target_height =200;
$target_layer=imagecreatetruecolor($target_width,$target_height);
imagecopyresampled($target_layer,$image_resource_id,0,0,0,0,$target_width,$target_height, $width,$height);
return $target_layer;
}
?>

<form name="frmImageResize" action="" method="post" enctype="multipart/form-data">
<input type="file" name="myImage" /> 
<input type="submit" name="submit" value="Submit" />
</form>