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    <p>Summary of existing answers plus my own two cents:</p> <h2>1. Basic answer</h2> <p>You can use the <code>header()</code> function to send a new HTTP header, but this must be sent to the browser before any HTML or text (so before the <code>&lt;!DOCTYPE ...&gt;</code> declaration, for example).</p> <pre><code>header('Location: '.$newURL); </code></pre> <h2>2. Important details</h2> <p><strong>die()</strong> or <strong>exit()</strong></p> <pre><code>header("Location: http://example.com/myOtherPage.php"); die(); </code></pre> <p>Why you should use <code>die()</code> or <code>exit()</code>: <a href="http://thedailywtf.com/Articles/WellIntentioned-Destruction.aspx" rel="noreferrer">The Daily WTF</a></p> <p><strong>Absolute or relative URL</strong></p> <p>Since June 2014 both absolute and relative URLs can be used. See <a href="https://greenbytes.de/tech/webdav/rfc7231.html#header.location" rel="noreferrer">RFC 7231</a> which had replaced the old <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.30" rel="noreferrer">RFC 2616</a>, where only absolute URLs were allowed.</p> <p><strong>Status Codes</strong></p> <p>PHP's "Location"-header still uses the <a href="http://en.wikipedia.org/wiki/HTTP_302" rel="noreferrer">HTTP 302</a>-redirect code, but this is not the one you should use. You should consider either <a href="http://en.wikipedia.org/wiki/HTTP_301" rel="noreferrer">301</a> (permanent redirect) or <a href="http://en.wikipedia.org/wiki/HTTP_303" rel="noreferrer">303</a> (other).</p> <p>Note: <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.4" rel="noreferrer">W3C mentions</a> that the 303-header is incompatible with "many pre-HTTP/1.1 user agents. Currently used browsers are all HTTP/1.1 user agents. This is not true for many other user agents like spiders and robots.</p> <h2>3. Documentation</h2> <p>HTTP Headers and the <code>header()</code> function in PHP</p> <ul> <li><a href="http://www.php.net/manual/en/function.header.php" rel="noreferrer">What the PHP manual says</a></li> <li><a href="http://en.wikipedia.org/wiki/List_of_HTTP_headers#Responses" rel="noreferrer">What Wikipedia says</a></li> <li><a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.30" rel="noreferrer">What the W3C says</a></li> </ul> <h2>4. Alternatives</h2> <p>You may use the alternative method of <code>http_redirect($url);</code> which needs the <a href="http://pecl.php.net/package/pecl_http" rel="noreferrer">PECL package pecl</a> to be installed.</p> <h2>5. Helper Functions</h2> <p>This function doesn't incorporate the 303 status code:</p> <pre><code>function Redirect($url, $permanent = false) { header('Location: ' . $url, true, $permanent ? 301 : 302); exit(); } Redirect('http://example.com/', false); </code></pre> <p>This is more flexible:</p> <pre><code>function redirect($url, $statusCode = 303) { header('Location: ' . $url, true, $statusCode); die(); } </code></pre> <h2>6. Workaround</h2> <p>As mentioned <code>header()</code> redirects only work before anything is written out. They usually fail if <a href="https://stackoverflow.com/questions/8028957/warning-headers-already-sent-in-php">invoked inmidst HTML</a> output. Then you might use a HTML header workaround (not very professional!) like:</p> <pre><code> &lt;meta http-equiv="refresh" content="0;url=finalpage.html"&gt; </code></pre> <p>Or a JavaScript redirect even.</p> <pre><code>window.location.replace("http://example.com/"); </code></pre>
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    1. POHow to make a redirect in PHP?
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    1. COSome problems with this answer: 303 may not be the "correct" status code. 301 may be desired for Google, for example. Secondly, `header('Location: '.$newURL);` must be before any HTML (or text) has been passed to the browser, or it will not work correctly.
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      1. USChuck Le Butt
 

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