/**
 * var_dump var
 * 
 * @param mixed $var 需要打印的变量
 * @param bool $halt 是否在此中断
 *  
 */
function pr($var, $halt=1)
{
	static $is_print_css=null;
 
	$backtrace = debug_backtrace();
 
	if( $is_print_css === null ) {
		echo<<<EOF
<style>
body { color:#fff;background-color:#3c3c3c; }
a { color:#94aefb; }
.func { font-weight:bold;color:#1ad77c; }
.trace_header { background-color:#515252;padding:5px;font-size:12px; }
.var { color:#f9dd1d;margin:3 0 30 20px;border-left:2px solid #88a3f2;background-color:#515252;padding:5px;font-weight:500;font-size:14px; }
.trace { border-left:3px solid #39c4dd;padding-left:2px; }
</style>
EOF;
	        $is_print_css = true;
	}
 
	//函数堆栈
	echo "<div class='trace_header'>";
	$i=0;
	foreach ( $backtrace as $key=>$val ) {	   
	   echo "<div class='trace' style='margin-left:".($i*50)."px;'>";
	   $path_info = pathinfo($val['file']);
	   echo "<span class='func'>{$val['function']}()</span>, <a href='#' onclick='return false;' title=\"".h($val['file'])."\"><b>".($path_info['basename'])."</b></a>: <b>{$val['line']}</b>";
	   echo "</div>";
	   $i++;
	}	
	echo "</div>";
 
	//变量信息
	echo "<pre class='var'><code>";
    var_dump($var);
    echo '</pre></div>';
 
    //echo "</div>";
 
    if( $halt ) exit();
}