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    <p>I think there is a typo in the last line of your <code>rewrite</code> rules.</p> <pre><code>RewriteRule ^(.*)$ index.php/?u=$1 [L,QSA] </code></pre> <p>seems should be corrected to</p> <pre><code>RewriteRule ^(.*)$ index.php?u=$1 [L,QSA] </code></pre> <hr> <p>I see two questions in your post:</p> <ol> <li>You want to get the <strong><em>slash-to-underscore</em></strong> converted URL value.</li> <li>When someone types in <code>/hi/hello/year</code> the URL should be <strong><em>redirected</em></strong> to <code>/hi_hello_year</code>.</li> </ol> <p><strong>URL rewrite</strong> and <strong>redirect</strong> are two independent actions. </p> <h2>1. Slash-to-underscore conversion</h2> <p>You already have <code>$_GET['u']</code> variable which holds <code>/hi/hello/year</code>.<br> Simply <code>str_replace</code>ing it will give you the converted URI string. </p> <pre><code>&lt;? // this is the landing index.php page specified in the last rewrite rule. // should be "/hi/hello/year" for "/hi/hello/year" URL request. $rewritten_uri = isset($_GET['u']) ? $_GET['u'] : ''; // converting slashes to underscores. $converted_uri = str_replace( '/', '_', $rewritten_uri ); // the string begins and/or ends with a slash, so remove it. $ready_to_use_uri = trim( $converted_uri, '_' ); ?&gt; </code></pre> <h2>2. Redirecting to a new URL</h2> <p>Someone who typed in <code>/hi/hello/year</code> should see a new <code>/hi_hello_year</code> URL in his/her browser.<br> This involves <code>header( "Location: ..." )</code>;</p> <pre><code>&lt;? $new_url = '/' . $ready_to_use_uri; // which came from the above code header( 'Location: ' . $new_url ); exit(); // unless you have some more work to do. ?&gt; </code></pre> <h2>3. Combined</h2> <p>However, above redirection is based on the assumption that the server has <code>hi_hello_year</code> document, otherwise it could lead to an endless <code>rewrite</code>-<code>redirect</code> loop. Let's combine and add a safety measure.</p> <pre><code>&lt;? // this is the landing index.php page specified in the last rewrite rule. // should be "/hi/hello/year" for "/hi/hello/year" URL request. $rewritten_uri = isset($_GET['u']) ? $_GET['u'] : ''; // converting slashes to underscores. $converted_uri = str_replace( '/', '_', $rewritten_uri ); // the string begins and/or ends with a slash, so remove it. $ready_to_use_uri = trim( $converted_uri, '_' ); // redirect only when such file exists if ( file_exist( $ready_to_use_uri ) ) { header( 'Location: /' . $ready_to_use_uri ); exit(); // unless you have some more work to do. } header("HTTP/1.0 404 Not Found"); echo "The document '" . $ready_to_use_uri . "' is not found on this server"; exit(); ?&gt; </code></pre>
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    1. COhi.. thanks.. this is working for me.. :)
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      1. USVincent Dagpin
 

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