$result=str_replace($search,$replace,$content)
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$temp=str_replace(" ", " ", $content);//æç©ºæ ¼æ¿æ¢ä¸ºhtml转ä¹â â
$content = str_replace("\n", "<br>",$temp);//æä¹åçç»æä¸çæ¢è¡æ¿æ¢æ<br/>
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