关于远程操作的函数

/**
 * Enhanced file_get_contents, use curl to fetch remote file
 * @param $file
 * @author Wilson Zeng
 */
function ex_file_get_contents($file){
    //if is url?
    if(preg_match('/^[a-zA-z]+:\/\/[^\s]*/i', $file)){//a url
        $ch = curl_init($file);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $rs = curl_exec($ch);
        curl_close($ch);
        return $rs;
    }else{
        return file_get_contents($file);
    }
}

/**
 * Enhanced copying file, can copy remote file(use curl)
 * @param $url
 * @param $destpath
 * @author Wilson Zeng
 */
function trans_file($url, $destpath){
    if(preg_match('/^[a-zA-z]+:\/\/[^\s]*/i', $url)){//a url
        $ch = curl_init($url);
        $opts = array(
            CURLOPT_RETURNTRANSFER => 1,
        );
        curl_setopt_array($ch, $opts);
        $file_str = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        if($http_code < 200 || $http_code >= 300 || file_put_contents($destpath, $file_str) <= 0){
            return FALSE;
        }
    }else{//a local file
        return copy($url, $destpath);
    }
    return TRUE;
}

/**
 * POST/GET remote url
 * @author Wilson Zeng
 * @param $url
 * @param $timeout [optinal]
 * @param $post_data [optional]
 * @param $http_code [optional] return http code
 * @return RESPONSE
 */
function get_remote_file($url, $timeout = 0, $post_data = NULL, &$http_code = NULL, &$curl_errno = NULL, &$curl_error = NULL){
    $ch = curl_init($url);
    $opts[CURLOPT_RETURNTRANSFER] = 1;
    if($post_data){
        $opts[CURLOPT_POST] = 1;
        if(is_array($post_data)){
            $opts[CURLOPT_POSTFIELDS] = http_build_query($post_data);
        }elseif(is_string($post_data)){
            $opts[CURLOPT_POSTFIELDS] = $post_data;
        }
    }
    if($timeout > 0){
        $opts[CURLOPT_TIMEOUT] = $timeout;
    }
    curl_setopt_array($ch, $opts);
    $rs = curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $curl_errno = curl_errno($ch);
    $curl_error = curl_error($ch);
    curl_close($ch);
    return $rs;
}