curl 异步捉取数据类

<?php

class RequestLib
{

    /**
     * GET 请求
     * @param string $url
     */
    public static function http_get($url)
    {
        $oCurl = curl_init();
        if (stripos($url, "https://") !== FALSE) {
            curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, FALSE);
            curl_setopt($oCurl, CURLOPT_SSLVERSION, 1); //CURL_SSLVERSION_TLSv1
        }
        curl_setopt($oCurl, CURLOPT_URL, $url);
        curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1);
        $sContent = curl_exec($oCurl);
        $aStatus = curl_getinfo($oCurl);
        curl_close($oCurl);

        if (intval($aStatus["http_code"]) == 200) {
            return $sContent;
        } else {
            return false;
        }
    }

    /**
     * POST 请求
     * @param string $url
     * @param array $param
     * @param boolean $post_file 是否文件上传
     * @return string content
     */
    public static function http_post($url, $param, $post_file = false, $isJson = false)
    {
        if (is_array($param) && count($param)) {
            $param = json_encode($param);
        }
        $oCurl = curl_init();
        if (stripos($url, "https://") !== FALSE) {
            curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, false);
            curl_setopt($oCurl, CURLOPT_SSLVERSION, 1); //CURL_SSLVERSION_TLSv1
        }
        if (is_string($param) || $post_file) {
            $strPOST = $param;
        } else {
            $aPOST = array();
            foreach ($param as $key => $val) {
                $aPOST[] = $key . "=" . urlencode($val);
            }
            $strPOST = join("&", $aPOST);
        }
        if (isset($_SESSION['CURLOPT_HTTPHEADER'])) {
            curl_setopt($oCurl, CURLOPT_HTTPHEADER, $_SESSION['CURLOPT_HTTPHEADER']);
        }
        if ($isJson) {
            curl_setopt($oCurl, CURLOPT_HTTPHEADER, array(
                    'Content-Type: application/json',
                    'Content-Length: ' . strlen($strPOST))
            );
        }
        curl_setopt($oCurl, CURLOPT_URL, $url);
        curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($oCurl, CURLOPT_POST, true);
        curl_setopt($oCurl, CURLOPT_POSTFIELDS, $strPOST);
        $sContent = curl_exec($oCurl);
        $aStatus = curl_getinfo($oCurl);
        curl_close($oCurl);

        if ($sContent) {
            return $sContent;
        } else {
            return false;
        }
    }

    /**
     * POST 请求
     * @param string $url
     * @param array $param
     * @param boolean $post_file 是否文件上传
     * @return string content
     */
    public static function http_post_async($url, $param, $post_file = false)
    {
        if (is_array($param) && count($param)) {
            $param = json_encode($param);
        }
        $oCurl = curl_init();
        if (stripos($url, "https://") !== FALSE) {
            curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, false);
            curl_setopt($oCurl, CURLOPT_SSLVERSION, 1); //CURL_SSLVERSION_TLSv1
        }
        if (is_string($param) || $post_file) {
            $strPOST = $param;
        } else {
            $aPOST = array();
            foreach ($param as $key => $val) {
                $aPOST[] = $key . "=" . urlencode($val);
            }
            $strPOST = join("&", $aPOST);
        }
        if (isset($_SESSION['CURLOPT_HTTPHEADER'])) {
            curl_setopt($oCurl, CURLOPT_HTTPHEADER, $_SESSION['CURLOPT_HTTPHEADER']);
        }
        curl_setopt($oCurl, CURLOPT_URL, $url);
        curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($oCurl, CURLOPT_NOSIGNAL, 1);//注意，毫秒超时一定要设置这个
        curl_setopt($oCurl, CURLOPT_TIMEOUT_MS, 50);//超时毫秒
        curl_setopt($oCurl, CURLOPT_POST, true);
        curl_setopt($oCurl, CURLOPT_POSTFIELDS, $strPOST);
        curl_exec($oCurl);
        curl_close($oCurl);

    }

    /**
     * 不支持中文转义的json结构
     * @param array $arr
     */
    static function json_encode($arr)
    {
        $parts = array();
        $is_list = false;
        //Find out if the given array is a numerical array
        $keys = array_keys($arr);
        $max_length = count($arr) - 1;
        if (($keys [0] === 0) && ($keys [$max_length] === $max_length)) { //See if the first key is 0 and last key is length - 1
            $is_list = true;
            for ($i = 0; $i < count($keys); $i++) { //See if each key correspondes to its position
                if ($i != $keys [$i]) { //A key fails at position check.
                    $is_list = false; //It is an associative array.
                    break;
                }
            }
        }
        foreach ($arr as $key => $value) {
            if (is_array($value)) { //Custom handling for arrays
                if ($is_list)
                    $parts [] = self::json_encode($value); /* :RECURSION: */
                else
                    $parts [] = '"' . $key . '":' . self::json_encode($value); /* :RECURSION: */
            } else {
                $str = '';
                if (!$is_list)
                    $str = '"' . $key . '":';
                //Custom handling for multiple data types
                if (!is_string($value) && is_numeric($value) && $value < 2000000000)
                    $str .= $value; //Numbers
                elseif ($value === false)
                    $str .= 'false'; //The booleans
                elseif ($value === true)
                    $str .= 'true';
                else
                    $str .= '"' . addslashes($value) . '"'; //All other things
                // :TODO: Is there any more datatype we should be in the lookout for? (Object?)
                $parts [] = $str;
            }
        }
        $json = implode(',', $parts);
        if ($is_list)
            return '[' . $json . ']'; //Return numerical JSON
        return '{' . $json . '}'; //Return associative JSON
    }

/**
 * curl 抓取图片
 * @param $url
 * @return mixed
 */
public static function downLoadImage($url)
{
    $header = array('Expect:');
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    $img = curl_exec($ch);
    curl_close($ch);

    //$return_code = curl_getinfo ( $ch, CURLINFO_HTTP_CODE );
    return $img;
}
}