Example of how PHP implements the method of uploading image files in POST mode

This article mainly shares with you an example of how to upload image files in PHP in POST mode. When calling the third-party API interface, sometimes you will encounter uploading images through http protocol. The following is an example of adding permanent materials to the WeChat public platform. ;

php code:

    /* 使用curl函数 */
    $url = "https://api.weixin.qq.com/cgi-bin/material/add_material?access_token=ACCESS_TOKEN&type=image";
    $post_data = array(
        'media' => '@bag03.jpg',
    );
    $response = curl_http($url, 'POST', $post_data);
    $params = array();
    $params = json_decode($response,true);
    if (isset($params['errcode']))
    {
        echo "error:" . $params['errcode'];
        echo "msg  :" . $params['errmsg'];
        exit;
    }
    var_dump( $params );
    
    /**
     * http请求方式: 默认GET
     */
    function curl_http($url, $method="GET", $postfields){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_URL, $url);
        switch ($method) {
            case "POST":
                curl_setopt($ch, CURLOPT_POST, true);
                if (!empty($postfields)) {
                    $hadFile = false;
                    if (is_array($postfields) && isset($postfields['media'])) {
                        /* 支持文件上传 */
                        if (class_exists('\CURLFile')) {
                            curl_setopt($ch, CURLOPT_SAFE_UPLOAD, true);
                            foreach ($postfields as $key => $value) {
                                if (isPostHasFile($value)) {
                                    $postfields[$key] = new \CURLFile(realpath(ltrim($value, '@')));
                                    $hadFile = true;
                                }
                            }
                        } elseif (defined('CURLOPT_SAFE_UPLOAD')) {
                            if (isPostHasFile($value)) {
                                curl_setopt($ch, CURLOPT_SAFE_UPLOAD, false);
                                $hadFile = true;
                            }
                        }
                    }
                    $tmpdatastr = (!$hadFile && is_array($postfields)) ? http_build_query($postfields) : $postfields;
                    curl_setopt($ch, CURLOPT_POSTFIELDS, $tmpdatastr);
                }
                break;
            default:
                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method); /* //设置请求方式 */
                break;
        }
        $ssl = preg_match('/^https:\/\//i',$url) ? TRUE : FALSE;
        curl_setopt($ch, CURLOPT_URL, $url);
        if($ssl){
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); // https请求 不验证证书和hosts
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); // 不从证书中检查SSL加密算法是否存在
        }
        $response =  curl_exec($ch);
        curl_close($ch);
        if(empty($response)){
            exit("错误请求");
        }
        return $response;
    }
    
    function isPostHasFile($value)
    {
        if (is_string($value) && strpos($value, '@') === 0 && is_file(realpath(ltrim($value, '@')))) {
            return true;
        }
        return false;
    }

You can also use PHP’s built-in system functions. If problems occur during use, it is recommended to check whether the corresponding system functions are enabled.

Use exec system function:

/* 使用exec函数 */
$command = 'curl -F media=@'.$filepath.' "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=image"';
$retval = array();
exec($command, $retval, $status);
$params = array();
$params = json_decode($retval[0],true);
if ($status != 0) {
    $params = array(
        'errcode'   => '-100',
        'errmsg'    => '公众号服务出错，请联系管理员',
    );
}
return $params;

Use system system function:

/* 使用system函数 */
$command = 'curl -F media=@'.$filepath.' "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=image"';
$retval = 1;
$last_line = system($command, $retval);
$params = array();
$params = json_decode($last_line,true);
if ($retval != 0) {
    if (isset($params['errcode'])) {
        $params = array(
            'errcode'   => '-100',
            'errmsg'    => '公众号服务出错，请联系管理员',
        );
    }
}
return $params;

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