进一步删除空行及前后空格：
<meta name="description" content="<?php $jianjie = $navinfor[smalltext]; $jianjie = str_replace(array('"','“','”','\"','“','”'),"",$jianjie); $jianjie = preg_replace("/(\r?\n)\\1+/","\\1",$jianjie); $jianjie = trim($jianjie); echo $jianjie;?>" />
或：
<meta name="description" content="<?php $jianjie = strip_tags（$navinfor[smalltext]）; $jianjie = preg_replace("/(\r?\n)\\1+/","\\1",$jianjie); echo $jianjie;?>" />
其中：
$jianjie = preg_replace("/(\r?\n)\\1+/","\\1",$jianjie); 删除空行
$jianjie = trim($jianjie); 删除前后空格
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