PHP读取文件/网址内容，保存

1，file_get_contents

<?php
$content = file_get_contents($getPath);
file_put_contents($savePath,$content);

<?php
$content = file_get_contents($getPath);
//file_get_contents超时处理
$opts = array(
  'http'=>array(
    'method'=>"GET",
    'timeout'=>1,//单位秒
  )
);
$cnt=0;
while($cnt<3 && ($content=file_get_contents($getPath, false, stream_context_create($opts)))===FALSE) $cnt++;
file_put_contents($savePath,$content);

<?php
//乱码问题，特别是txt文件
$file_content = mb_convert_encoding( file_get_contents($getPath, 'UTF-8', 'UTF-8,GBK,GB2312,BIG5' );

2，fopen

<?php
$handle = fopen($getPath, 'r');
while(false != ($a = fread($handle, 10240))){//返回false表示已经读取到文件末尾
  $content .= $a;
}
fclose($handle);

<?php
//分块读取并分块写入
$handle = fopen($getPath, 'r'); //只读方式打开
$toHandle = fopen($savePath,'a'); //写入方式打开，不存在则创建
while(false != ($a = fread($handle, 10240))){//返回false表示已经读取到文件末尾
  fwrite($toHandle,$a);
}
fclose($toHandle);
fclose($handle);

<?php
$handle = fopen($getPath, "rb");
$getData = fread($handle, 8096);
$toHandle = fopen($savePath, "wb");
while ($getData) {
  fwrite($file, $getData);
  $getData = fread($handle, 8096);
}
fclose($handle);
fclose($toHandle);

<?php
//$fileSize 文件大小
$fp = fopen ( $file_path, "rb" ); // 打开文件
$dstStream = fopen ( 'php://output', 'wb' );  //直接输出到浏览器
$offset = 0;
$chunksize = 4096; //分块大小
while ( ! feof ( $fp ) && $offset < $fileSize ) {
  $last_size = $fileSize - $offset;
  if ($chunksize > $last_size && $last_size > 0) {
    $chunksize = $last_size;
  }
  $offset += stream_copy_to_stream ( $fp, $dstStream, $chunksize, $offset );
}
fclose ( $dstStream );
fclose ( $fp );

3，fsockopen

参考来源：https://blog.csdn.net/navioo/article/details/82771663

<?php
/**
 * 使用fsockopen发送URL请求
 * @param $url
 * @param $method: GET、POST等
 * @param array $params
 * @param array $header
 * @param int $timeout
 * @return array|bool
 */
function sendHttpRequest($url, $method = 'GET', $params = [], $header = [], $timeout = 30)
{
    $urlInfo = parse_url($url);
    if (isset($urlInfo['scheme']) && strcasecmp($urlInfo['scheme'], 'https') === 0) //HTTPS
    {
        $prefix = 'ssl://';
        $port = 443;
    }else{  //HTTP
        $prefix = 'tcp://';
        $port = isset($urlInfo['port']) ? $urlInfo['port'] : 80;
    }
    $host = $urlInfo['host'];
    $path = isset($urlInfo['path']) ? $urlInfo['path'] : '/';
    if(!empty($params) && is_array($params))
    {
        $params = http_build_query($params);
    }
    $contentType = '';
    $contentLength = '';
    $requestBody = '';
    if($method === 'GET')
    {
        $params = $params ? '?' . $params : '';
        $path .= $params;
    }else{
        $requestBody = $params;
        $contentType = "Content-Type: application/x-www-form-urlencoded\r\n";
        $contentLength = "Content-Length: " . strlen($requestBody) . "\r\n";
    }
    $auth = '';
    if(!empty($urlInfo['user']))
    {
        $auth = 'Authorization: Basic ' . base64_encode($urlInfo['user'] . ':' . $urlInfo['pass']) . "\r\n";
    }
    if($header && is_array($header))
    {
        $tmpString = '';
        foreach ($header as $key => $value)
        {
            $tmpString .= $key . ': ' . $value . "\r\n";
        }
        $header = $tmpString;
    }else{
        $header = '';
    }
    $out = "$method $path HTTP/1.1\r\n";
    $out .= "Host: $host\r\n";
    $out .= $auth;
    $out .= $header;
    $out .= $contentType;
    $out .= $contentLength;
    $out .= "Connection: Close\r\n\r\n";
    $out .= $requestBody;//post发送数据前必须要有两个换行符\r\n
    $fp = fsockopen($prefix . $host, $port, $errno, $errstr, $timeout);
    if(!$fp)
    {
        return false;
    }
    if(!fwrite($fp, $out))
    {
        return false;
    }
    $response = '';
    while(!feof($fp))
    {
        $response .= fread($fp, 1024);
    }
    if(!$response)
    {
        return false;
    }
    fclose($fp);
    $separator = '/\r\n\r\n|\n\n|\r\r/';
    list($responseHeader, $responseBody) = preg_split($separator, $response, 2);
    $httpResponse = array(
        'header' => $responseHeader,
        'body' => $responseBody
    );
    return $httpResponse;
}