php & xml & sub_str

 
function postXML($url, $xmlData){
    $header[] = "Content-type: text/xml";        //定义content-type为xml,注意是数组
    $ch = curl_init ($url);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $xmlData);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);//超时设置30s
    $response = curl_exec($ch);
    curl_close($ch);
    return $response;
}
function getXML(){
    $postStr = $GLOBALS['HTTP_RAW_POST_DATA'];
    return empty($postStr) ? array() : xml_to_array($postStr);
}
function array_to_xml($arr, $dom=0, $item=0, $root='root'){
    if (!$dom){
        $dom = new DOMDocument("1.0");
    }
    if(!$item){
        $item = $dom->createElement($root); 
        $dom->appendChild($item);
    }
    foreach ($arr as $key=>$val){
        $itemx = $dom->createElement(is_string($key)?$key:"item");
        $item->appendChild($itemx);
        if (!is_array($val)){
            $text = $dom->createTextNode($val);
            $itemx->appendChild($text);
             
        }else {
            array_to_xml($val,$dom,$itemx);
        }
    }
    return $dom->saveXML();
}
function xml_to_array($xml){
    $array = (array)(simplexml_load_string ($xml));
    foreach ($array as $key => $item){
        $array[$key] = struct_to_array ((array)$item);
    }
    return $array;
}
function struct_to_array($item){
    if (!is_string($item)) {
        $item = (array)$item;
        foreach($item as $key => $val){
            $item [$key] = struct_to_array ($val);
        }
    }
    return $item;
}
function sub_str($str, $length = 0){
    $str = trim($str);
    $strlength = strlen($str);
  
    if ($length == 0 || $length >= $strlength){
        return $str;  //截取长度等于0或大于等于本字符串的长度，返回字符串本身
    }
    elseif ($length < 0)  { //如果截取长度为负数
        $length = $strlength + $length;//那么截取长度就等于字符串长度减去截取长度
        if ($length < 0){
            $length = $strlength;//如果截取长度的绝对值大于字符串本身长度，则截取长度取字符串本身的长度
        }
    }
  
    if (function_exists('mb_substr')){
        $newstr = mb_substr($str, 0, $length, EC_CHARSET);
    }
    elseif (function_exists('iconv_substr')){
        $newstr = iconv_substr($str, 0, $length, EC_CHARSET);
    }
    else{
        //$newstr = trim_right(substr($str, 0, $length));
        $newstr = substr($str, 0, $length);
    }
    return $newstr;
}