$test_string = 'this is a "test as" string juventus vs "napoli" is  b a bing match';echo convertQuotToChinese($test_string); function convertQuotToChinese($string) {    $flag = false; //false显示开始的中文引号,true时显示结束的中文引号    while(false !== ($i = strpos($string, '"'))) {        $begin_string = substr($string, 0, $i);        $end_string = substr($string, $i+1-strlen($string));        $quot = $flag ? '”' : '“';        $flag = !$flag;        $string = $begin_string.$quot.$end_string;        }    return $string;}