解决php array数组生成xml文件汉字编码问题

function array2xml($array, $xml = false){
    if($xml === false){
        $xml = new SimpleXMLElement('<root/>');
    }
    foreach($array as $key => $value){
        if(is_array($value)){
            array2xml($value, $xml->addChild($key));
        }else{
            $xml->addChild($key, $value);
        }
    }
    return $xml->asXML();
}
 
header('Content-type: text/xml');
print array2xml($array);

 
function array2xml($array, $xml = false){
    if($xml === false){
        $xml = new SimpleXMLElement('<root/>');
    }
    foreach($array as $key => $value){
        if(is_array($value)){
            array2xml($value, $xml->addChild($key));
        }else{
           
//$value=utf8_encode($value);
 
            if (preg_match("/([x81-xfe][x40-xfe])/", $value, $match)) {
                $value = iconv('gbk', 'utf-8', $value);  
//判断是否有汉字出现
            }
            $xml->addChild($key, $value);
        }
    }
    return $xml->asXML();
}

<?php
    $str = '全部是汉字测试';
    if (preg_match_all("/^([x81-xfe][x40-xfe])+$/", $str, $match)) {
        echo '全部是汉字'; 
    } else {
        echo '不全是汉字';
    }
?>

# Open the File.
if (($handle = fopen("test.csv", "r")) !== FALSE) {
    # Set the parent multidimensional array key to 0.
    $nn = 0;
    while (($data = fgetcsv($handle, 0, ",")) !== FALSE) {
       
//print_r($data);
        # Count the total keys in the row.
        $c = count($data);
        # Populate the multidimensional array.
        for ($x=0;$x<$c;$x++)
        {
            $csvarray[$nn][$x] = $data[$x];
        }
        $nn++;
    }
    # Close the File.
    fclose($handle);
}
//print_r($csvarray);

function __fgetcsv(& $handle, $length = null, $d = ',', $e = '"') {
     $d = preg_quote($d);
     $e = preg_quote($e);
     $_line = "";
     $eof=false;
     while ($eof != true) {
         $_line .= (empty ($length) ? fgets($handle) : fgets($handle, $length));
         $itemcnt = preg_match_all('/' . $e . '/', $_line, $dummy);
         if ($itemcnt % 2 == 0)
             $eof = true;
     }
     $_csv_line = preg_replace('/(?: |[ ])?$/', $d, trim($_line));
     $_csv_pattern = '/(' . $e . '[^' . $e . ']*(?:' . $e . $e . '[^' . $e . ']*)*' . $e . '|[^' . $d . ']*)' . $d . '/';
     preg_match_all($_csv_pattern, $_csv_line, $_csv_matches);
     $_csv_data = $_csv_matches[1];
     for ($_csv_i = 0; $_csv_i < count($_csv_data); $_csv_i++) {
         $_csv_data[$_csv_i] = preg_replace('/^' . $e . '(.*)' . $e . '$/s', '$1' , $_csv_data[$_csv_i]);
         $_csv_data[$_csv_i] = str_replace($e . $e, $e, $_csv_data[$_csv_i]);
     }
     return empty ($_line) ? false : $_csv_data;
}

echo mb_substr(‘原本会出现乱码的汉字！’, 0, 7, ‘utf-8′);

$description = mb_substr(strip_tags($post->post_content),0,220,’utf-8′);

<?php
$str = '这样一来我的字符串就不会有乱码^_^';

echo "mb_substr:" . mb_substr($str, 0, 7, 'utf-8');
//结果：这样一来我的字
echo "<br>";

echo "mb_strcut:" . mb_strcut($str, 0, 6, 'utf-8');
//结果：这样
?>