Using PHP cURL for GET, POST, File Upload, and General HTTP Requests

The article explains that cURL is a PHP extension that must be enabled in the php.ini file and demonstrates how to use it for various HTTP operations.

GET method

function http_get($url){
  // 初始化
  $ch = curl_init();
  // 相关设置
  # 设置请求的URL地址
  curl_setopt($ch, CURLOPT_URL, $url);
  # 请求头关闭
  curl_setopt($ch, CURLOPT_HEADER, 0);
  # 请求的得到的结果不直接输出，而是以字符串结果返回  必写
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  # 设置请求的超时时间 单位秒
  curl_setopt($ch, CURLOPT_TIMEOUT, 30);
  # 设置浏览器型号
  curl_setopt($ch, CURLOPT_USERAGENT, 'MSIE001');

  # 证书不检查
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

  // 发起请求
  $data = curl_exec($ch);

  // 有没有发生异常
  if (curl_errno($ch) > 0) {
    // 把错误发送给客户端
    echo curl_error($ch);
    $data = '';
  }

  // 关闭请求
  curl_close($ch);

  return $data;
}
echo http_get('http://localhost:8080/post.php');

POST method

function http_post($url, $ret){
  // 初始化
  $ch = curl_init();
  // 相关设置
  # 设置请求的URL地址
  curl_setopt($ch, CURLOPT_URL, $url);
  # 请求头关闭
  curl_setopt($ch, CURLOPT_HEADER, 0);
  # 请求的得到的结果不直接输出，而是以字符串结果返回  必写
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  # 设置请求的超时时间 单位秒
  curl_setopt($ch, CURLOPT_TIMEOUT, 30);
  # 设置浏览器型号
  curl_setopt($ch, CURLOPT_USERAGENT, 'MSIE001');

  # 证书不检查
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

  # 设置为post请求
  curl_setopt($ch, CURLOPT_POST, 1);
  # post请求的数据
  curl_setopt($ch, CURLOPT_POSTFIELDS, $ret);

  // 发起请求
  $data = curl_exec($ch);

  // 有没有发生异常
  if (curl_errno($ch) > 0) {
    echo curl_error($ch);
    $data = '';
  }

  // 关闭请求
  curl_close($ch);

  return $data;
}
echo http_post('http://localhost:8080/post.php', ['id'=>1, 'name'=>'张三']);

File upload method

function http_post_file($url, $ret, $file=''){
  if (!empty($file)) {
    // 有文件上传
    $ret['pic'] = new CURLFile($file);
  }
  // 初始化
  $ch = curl_init();
  // 相关设置
  # 设置请求的URL地址
  curl_setopt($ch, CURLOPT_URL, $url);
  # 请求头关闭
  curl_setopt($ch, CURLOPT_HEADER, 0);
  # 请求的得到的结果不直接输出，而是以字符串结果返回  必写
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  # 设置请求的超时时间 单位秒
  curl_setopt($ch, CURLOPT_TIMEOUT, 30);
  # 设置浏览器型号
  curl_setopt($ch, CURLOPT_USERAGENT, 'MSIE001');
  # 证书不检查
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
  # 设置为post请求
  curl_setopt($ch, CURLOPT_POST, 1);
  # post请求的数据
  curl_setopt($ch, CURLOPT_POSTFIELDS, $ret);

  // 发起请求
  $data = curl_exec($ch);

  // 有没有发生异常
  if (curl_errno($ch) > 0) {
    echo curl_error($ch);
    $data = '';
  }

  // 关闭请求
  curl_close($ch);

  return $data;
}
$file = __DIR__ . '/1.jpg';
echo http_post_file('http://localhost:8080/post.php', ['id'=>1, 'name'=>'张三'], $file);

General request method

function http_request($url, $ret='', $file=''){
  if (!empty($file)) {
    $ret['pic'] = new CURLFile($file);
  }
  // 初始化
  $ch = curl_init();
  // 相关设置
  # 设置请求的URL地址
  curl_setopt($ch, CURLOPT_URL, $url);
  # 请求头关闭
  curl_setopt($ch, CURLOPT_HEADER, 0);
  # 请求的得到的结果不直接输出，而是以字符串结果返回  必写
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  # 设置请求的超时时间 单位秒
  curl_setopt($ch, CURLOPT_TIMEOUT, 30);
  # 设置浏览器型号
  curl_setopt($ch, CURLOPT_USERAGENT, 'MSIE001');
  # 证书不检查
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
  # 设置为post请求
  if ($ret) { // 如果 $ret 不为假则是 post 提交
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $ret);
  }
  // 发起请求
  $data = curl_exec($ch);

  // 有没有发生异常
  if (curl_errno($ch) > 0) {
    echo curl_error($ch);
    $data = '';
  }

  // 关闭请求
  curl_close($ch);

  return $data;
}
// GET example
echo http_request('https://wx.520xxxx.cn');

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