Essential Books

Using Output buffer to store contents in a file useful for reports invoices etc

suggest change 
<?php
ob_start();
?>
    <html>
    <head>
        <title>Example invoice</title>
    </head>
    <body>
    <h1>Invoice #0000</h1>
    <h2>Cost: &pound;15,000</h2>
    ...
    </body>
    </html>
<?php
$html = ob_get_clean();

$handle = fopen('invoices/example-invoice.html', 'w');
fwrite($handle, $html);
fclose($handle);

This example takes the complete document, and writes it to file, it does not output the document into the browser, but do by using echo $html;

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Output buffering:
* Output Buffering
* Basic usage getting content between buffers and clearing
* Nested output buffers
* Running output buffer before any content
* Processing the buffer via a callback
* Using Output buffer to store contents in a file useful for reports invoices etc
* Stream output to client
* Capturing the output buffer to re-use later
* Typical usage and reasons for using ob start
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