php file_get_contents 使用3法

<?php
//GET
function http_get($url, $params){
    return file_get_contents($url.'?'.http_build_query($params));
}
//POST
function http_post($url, $params){
    $eol = "\r\n";
    $content = http_build_query ($params);
    $header = 'Content-type: application/x-www-form-urlencoded'.$eol.
              "Content-Length: " . strlen($content).$eol;
    $opts = array('http' =>
        array(
            'method'  => 'POST',
            'header'  => $header,
            'content' => $content
        )
    );
    $context  = stream_context_create($opts);
    return file_get_contents($url, false, $context);
}
//UPLOAD
function http_upload($url, $file){
    $MULTIPART_BOUNDARY = '--------------------------'.microtime(true);
    $FORM_FIELD = 'uploaded_file';
    $header = 'Content-Type: multipart/form-data; boundary='.$MULTIPART_BOUNDARY;
    $content =  "--".$MULTIPART_BOUNDARY."\r\n".
        "Content-Disposition: form-data; name=\"".$FORM_FIELD."\"; file=\"".basename($file)."\"\r\n".
        "Content-Type: application/zip\r\n\r\n".
        file_get_contents($file)."\r\n".
        "--".$MULTIPART_BOUNDARY."--\r\n";
    $context = stream_context_create(array(
        'http' => array(
            'method' => 'POST',
            'header' => $header,
            'content' => $content,
        )
    ));
    return file_get_contents($url, false, $context);
}
?>