PHP常用方法汇总

 函数效果：

/**
 * 正则匹配img标签src
 * @param $tag
 * @return array
 */
function extract_attrib($tag) {
    preg_match_all('/(id|alt|title|src)=("[^"]*")/i', $tag, $matches);
    $ret = array();
    foreach($matches[1] as $i => $v) {
        $ret[$v] = $matches[2][$i];
    }
    return $ret;
}

function gf_dump($var) {
    echo '<pre>';
    print_r($var);
    echo '</pre>';
}

function gf_now($time = 0) {
    $time = empty($time) ? time() : $time;
    return date('Y-m-d H:i:s', $time);
}

/**
 * 安全的获取客户端IP
 * @return string
 */
function gf_get_remote_addr() {
    if(!empty($_SERVER["HTTP_CLIENT_IP"])) {
        $chp = $_SERVER["HTTP_CLIENT_IP"];
    } else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"])) {
        $chp = $_SERVER["HTTP_X_FORWARDED_FOR"];
    } else if(!empty($_SERVER["REMOTE_ADDR"])) {
        $chp = $_SERVER["REMOTE_ADDR"];
    } else {
        $chp = '';
    }
    // ipv4 & ipv6
    preg_match("/[d.]{7,15}|[:0-9a-fA-F]+/", $chp, $chps);
    $chp = isset($chps[0]) ? $chps[0] : 'unknown';
    unset($chps);
    return $chp;
}

/**
 * http post 请求
 * @param  [string] $url        [description]
 * @param  [string] $parameters [description]
 * @param  array  $headers    [description]
 * @return [obj]             [description]
 */
function gf_http_post($url,$parameters = NULL, $headers = array()){
    return gf_http($url,'post' ,$parameters , $headers );
}

/**
 * http get 请求
 * @param  [string] $url        [description]
 * @param  [string] $parameters [description]
 * @param  array  $headers    [description]
 * @return [obj]             [description]
 */
function gf_http_get($url, $parameters = NULL,$headers = array()){
    return gf_http($url,'get' ,$parameters , $headers );
}

/**
 * [gf_http description]
 * @param  [type] $url        [description]
 * @param  [type] $method     [description]
 * @param  [type] $parameters [description]
 * @param  array  $headers    [description]
 * @return [type]             [description]
 */
function gf_http($url, $method, $parameters = NULL, $headers = array()) {
    if(empty($url)){return NULL;}
    $ch = curl_init();
    /* Curl settings */
    curl_setopt($ch, CURLOPT_HTTP_VERSION           , CURL_HTTP_VERSION_1_0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER         , TRUE);
    curl_setopt($ch, CURLOPT_TIMEOUT                , 3000);
    curl_setopt($ch, CURLOPT_HEADER                 , FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER         , FALSE); // 跳过证书检查
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST         , 2);  // 从证书中检查SSL加密算法是否存在
    switch (strtolower($method)) {
        case 'post':
            curl_setopt($ch, CURLOPT_POST, TRUE);
            if (!empty($parameters)) {
                curl_setopt($ch, CURLOPT_POSTFIELDS, $parameters);
            }
            break;
        case 'get':
            if (!empty($parameters)) {
                $url .= strpos($url, '?') === false ? '?' : '&';
                $url .= http_build_query($parameters);
            }
            break;
        default:
            # code...
            break;
    }
    curl_setopt($ch, CURLOPT_URL                    , $url );
    curl_setopt($ch, CURLOPT_HTTPHEADER             , $headers);
    curl_setopt($ch, CURLINFO_HEADER_OUT            , TRUE );
    $response = curl_exec($ch);
    curl_close ($ch);
    return $response;
}