White space character conversion problems

White space conversion & lt ;? Echo $ _ POST ['AAA']. '& lt; br & gt;'; functionhtmlpost ($ x) {$ x1 = array (''); $ x2 = array (& quot; & amp; nbsp; & quot;); $ x = str_replace ($ x1, $ x2, $ x); reblank character conversion problem
Echo $ _ POST ['AAA'].'
';
Function htmlpost ($ x ){
$ X1 = array ('');
$ X2 = array ("");
$ X = str_replace ($ x1, $ x2, $ x );
Return $ x;
}
Echo $ _ POST ['AAA'] = htmlpost ($ _ POST ['AAA']);
?>


Enter two or more consecutive blank characters in the input box.
There is no problem when submitting for the first time. the white space character can be converted, but the white space character is not converted
What is the reason?

------ Solution --------------------
Utf8