<?php
/**
* Echo img tag
*
* @param integer $fileno
* @return string
*/
function echo_img_tag( $fileno = 001 ) {
if ( preg_match( '/\A([0-9]{2,3}+)\z/', $fileno ) ) return '<img src="./images/img' . $fileno . '.jpg">';
else
return '<img src="./images/noimage.jpg">';
}
echo echo_img_tag( $_GET['no'] );
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