PHP可以用哪些函数POST数据呢？

<?php
function request_by_socket($remote_server,$remote_path,$post_string,$port = 80,$timeout = 30){
    $socket = fsockopen($remote_server,$port,$errno,$errstr,$timeout);
     if (!$socket) die("$errstr($errno)");
          
    fwrite($socket,"POST $remote_path HTTP/1.0\r\n");
    fwrite($socket,"User-Agent: Socket Example\r\n");
    fwrite($socket,"HOST: $remote_server\r\n");
    fwrite($socket,"Content-type: application/x-www-form-urlencoded\r\n");
    fwrite($socket,"Content-length: ".strlen($post_string)+8."\r\n");
    fwrite($socket,"Accept:*
function request_by_curl($remote_server,$post_string){
    $ch = curl_init();
    curl_setopt($ch,CURLOPT_URL,$remote_server);
    curl_setopt($ch,CURLOPT_POSTFIELDS,'mypost='.$post_string);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch,CURLOPT_USERAGENT,"Jimmy's CURL Example beta");
    $data = curl_exec($ch);
    curl_close($ch);
     return $data;
}
      
function request_by_other($remote_server,$post_string){
    $context = array(
        'http'=>array(
            'method'=>'POST',
            'header'=>'Content-type: application/x-www-form-urlencoded'."\r\n".
                      'User-Agent : Jimmy\'s POST Example beta'."\r\n".
                      'Content-length: '.strlen($post_string)+8,
            'content'=>'mypost='.$post_string)
         );
    $stream_context = stream_context_create($context);
    $data = file_get_contents($remote_server,FALSE,$stream_context);
     return $data;
}
?>