php-系統包含的常用函數具體有什麼用哪位大神能幫忙解釋一下嗎？

php

function unhtml($content){
$content=str_replace("&","&",$content);
$content=str_replace(" $content=str_replace(">",">",$content);
$content=str_replace(" "," ",$content);
$content=str_replace(chr(13),"
", $content);
$content=str_replace("","\",$content);
$content=str_replace(chr(34),""",$content);

<code>         return $content;        }</code>

?>

rrreee

?>

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