通过回调处理缓冲区

你可以通过将 callable 传递给 ob_start() 来对输出应用任何类型的附加处理。

<?php
function clearAllWhiteSpace($buffer) {
    return str_replace(array("\n", "\t", ' '), '', $buffer);
}

ob_start('clearAllWhiteSpace');
?>
<h1>Lorem Ipsum</h1>

<p><strong>Pellentesque habitant morbi tristique</strong> senectus et netus et malesuada fames ac turpis egestas. <a href="#">Donec non enim</a> in turpis pulvinar facilisis.</p>

<h2>Header Level 2</h2>

<ol>
   <li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>
   <li>Aliquam tincidunt mauris eu risus.</li>
</ol>

<?php
/* Output will be flushed and processed when script ends or call
     ob_end_flush();
*/

输出：

<h1>LoremIpsum</h1><p><strong>Pellentesquehabitantmorbitristique</strong>senectusetnetusetmalesuadafamesacturpisegestas.<ahref="#">Donecnonenim</a>inturpispulvinarfacilisis.</p><h2>HeaderLevel2</h2><ol><li>Loremipsumdolorsitamet,consectetueradipiscingelit.</li><li>Aliquamtinciduntmauriseurisus.</li></ol>