POST 提交

<?php
 print_r($_REQUEST);
if(!empty($_POST)){
     if($_POST['opt'] == '+')
     {
         $num = (int)$_POST['x'] + (int)$_POST['y'];
     }else if($_POST['opt'] == '-')
     {
        $num = (int)$_POST['x'] - (int)$_POST['y'];
     }else if($_POST['opt'] == '*')
    {
         $num = (int)$_POST['x'] * (int)$_POST['y'];
     }else if($_POST['opt'] == '/')
     {
         $num = (int)$_POST['x'] / (int)$_POST['y'];
     }else if($_POST['opt'] == '%')
     {
         $num = (int)$_POST['x'] % (int)$_POST['y'];
     }
     echo 'x'. $_POST['opt'] . 'y 计算结果：' .$num;
 }else if($_POST['opt'] == '%')
  {
      $num = (int)$_POST['x'] % (int)$_POST['y'];
  }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h1>计算器</h1>
    <form action="" method="post">
        <input type="number" name="x" value="<?=isset($_POST['x'])?$_POST['x']:''; ?>" />
        <select name="opt">
            <option value="+" <?=isset($_POST['opt']) && $_POST['opt']=='+'?'selected':'' ?>>+</option>
            <option value="-" <?=isset($_POST['opt']) && $_POST['opt']=='-'?'selected':'' ?>>-</option>
            <option value="*" <?=isset($_POST['opt']) && $_POST['opt']=='*'?'selected':'' ?>>*</option>
            <option value="/" <?=isset($_POST['opt']) && $_POST['opt']=='/'?'selected':'' ?>>/</option>
            <option value="%" <?=isset($_POST['opt']) && $_POST['opt']=='%'?'selected':'' ?>>%</option>
        </select>
        <input type="number" name="y" value="<?=isset($_POST['y'])?$_POST['y']:''; ?>" />
        <input type="submit" value="计算" />
    </form>
</body>
</html>

CURL 网络请求

<?php
function get_url($url,$data,$is_post=0){
        $ch = curl_init();  
         curl_setopt($ch, CURLOPT_URL ,'http://apis.juhe.cn/simpleWeather/query?key=abc4b64ae7656b460723402175a5650b&city=合肥');
        if($is_post == 0){
            if(!empty($data)){
                $url .= '?';
                foreach($data as $k=>$v){
                    $url .= $k . '=' . $v . '&';
                }
            }
        }
        curl_setopt($ch, CURLOPT_URL ,$url);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3); 
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);      
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_AUTOREFERER, 1);   
        curl_setopt($ch, CURLOPT_HEADER, 0);        
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_USERAGENT, 'Data');
        curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1); 
        if($is_post == 1){
            curl_setopt($ch, CURLOPT_POST, 1); 
            curl_setopt($ch, CURLOPT_POSTFIELDS , $data);
        }
        $html = curl_exec($ch); 
        if(curl_errno($ch)){
            return curl_errno($ch);
        }
        curl_close($ch);
        return $html;
    }
    $data = [
        'key' => 'abc4b64ae7656b460723402175a5650b',
        'city' => '合肥'
    ];
    echo get_url('http://apis.juhe.cn/simpleWeather/query',$data);
?>

PHP POST提交，CURL网络请求

POST 提交

CURL 网络请求