http://www.php.net/manual/en/function.print-r.php#90759归功于鲍勃

<?PHP
function print_r_tree($data)
{
    // capture the output of print_r
    $out = print_r($data,true);

    // replace something like '[element] => <newline> (' wITh <a href="javascript:toggleDisplay('...');">...</a><div id="..." style="display: none;">
    $out = preg_replace('/([ \t]*)(\[[^\]]+\][ \t]*\=\>[ \t]*[a-z0-9 \t_]+)\n[ \t]*\(/iUe',"'\\1<a href=\"javascript:toggleDisplay(\''.(\$id = substr(md5(rand().'\\0'),7)).'\');\">\\2</a><div id=\"'.\$id.'\" style=\"display: none;\">'",$out);

    // replace ')' on its own on a new line (surrounded by whitespace is ok) with '</div>
    $out = preg_replace('/^\s*\)\s*$/m','</div>',$out);

    // print the javascript function toggleDisplay() and then the transformed output
    echo '<script language="Javascript">function toggleDisplay(id) { document.getElementById(id).style.display = (document.getElementById(id).style.display == "block") ? "none" : "block"; }</script>'."\n$out";
}
?>

如果您使用Drupal作为标记暗示,您可以将它放在主题的template.PHP文件中.