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function getStr($str){
        $len=strlen($str);
        for ($i=0;$i<$len/2;$i++){
                $temp=$str[$i];
                $str[$i]=$str[$len-$i-1];
                $str[$len-$i-1]=$temp;
        }
           return $str;
}
echo getStr("abcdef");
?>
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$str2 = false;
echo $str1==$str2 ? 'ÏàµÈ' : '²»ÏàµÈ';
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$str3 = '';
$str4 = 0;
echo $str3==$str4 ? 'ÏàµÈ' : '²»ÏàµÈ';
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$str5 = 0;
$str6 = '0';
echo $str5===$str6 ? 'ÏàµÈ' : '²»ÏàµÈ';
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echo '<br/>';
$a1 = null;
$a2 = false;
$a3 = 0;
$a4 = '';
$a5 = '0';
$a6 = 'null';
$a7 = array();
$a8 = array(array());
echo empty($a1) ? 'true' : 'false';
echo empty($a2) ? 'true' : 'false';
echo empty($a3) ? 'true' : 'false';
echo empty($a4) ? 'true' : 'false';
echo empty($a5) ? 'true' : 'false';
echo empty($a6) ? 'true' : 'false';
echo empty($a7) ? 'true' : 'false';
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