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//////// Html code add into abc.php
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Single Upload Form with PHP</title>
  </head>
  <body>

	<form method="POST" action="upload.php" enctype="multipart/form-data">
		<label for="file"> Pick a file :  </label>
		<input type="file" name ="file1">
		Add Watermark :
			<input type="file" name ="file2">
		<input type="submit" value = "Upload">
	</form>
  </body>
</html>

//////////// add into upload.php php code

<?php
    //Check if the file is well uploaded
    if($_FILES['file1']['error'] || $_FILES['file2']['error']  > 0) { echo 'Error during uploading, try again'; }

    //We won't use $_FILES['file']['type'] to check the file extension for security purpose

    //Set up valid image extensions
    $extsAllowed = array( 'jpg', 'jpeg', 'png', 'gif' );

    //Extract extention from uploaded file
        //substr return ".jpg"
        //Strrchr return "jpg"

    $extUpload = strtolower( substr( strrchr($_FILES['file1' ]['name'] , '.') ,1) ) ;
    $extUpload1 = strtolower( substr( strrchr($_FILES['file2' ]['name'] , '.') ,1) ) ;
    //Check if the uploaded file extension is allowed

    if (in_array($extUpload, $extsAllowed, $extUpload1) ) {

    //Upload the file on the server

    $name = "./{$_FILES['file1']['name']}";
    $name1 = "./{$_FILES['file2']['name']}";
        $result = move_uploaded_file($_FILES['file1']['tmp_name'], $name);
        $result1 = move_uploaded_file($_FILES['file2']['tmp_name'], $name1);
    if($result){echo "<img src='$name'/>";}

     else { echo 'File is not valid. Please try again'; }

     if($result1){echo "<img src='$name1'/>";}

    } else { echo 'File is not valid. Please try again'; }
?>