PHP uses curl to read HTTP chunked data

For the HTTP chunked data returned by the Web server, we may want to get a callback when each chunk returns, instead of calling back after all responses are returned. For example, when the server is icomet.

The curl code used in PHP is as follows :

<?php  
$url = "http://127.0.0.1:8100/stream";

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_WRITEFUNCTION, 'myfunc');
$result = curl_exec($ch);
curl_close($ch);

function myfunc($ch, $data){
    $bytes = strlen($data);
    // 处理 data
    return $bytes;
}

But, there is a problem here. For a chunk, the callback function may be called multiple times, each time about 16k of data. This is obviously not what we want. Because a chunk of icomet starts with "n" At the end, so the callback function can be buffered.

function myfunc($ch, $data){
    $bytes = strlen($data);
    static $buf = '';
    $buf .= $data;
    while(1){
        $pos = strpos($buf, "\n");
        if($pos === false){
            break;
        }
        $data = substr($buf, 0, $pos+1);
        $buf = substr($buf, $pos+1);

        // 处理 data
    }
}

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The above introduces PHP to use curl to read HTTP chunked data, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.