stream_notification_callback

(PHP 5 >= 5.2.0)

stream_notification_callbackA callback function for the notification context paramater

Description

void stream_notification_callback ( int $notification_code , int $severity , string $message , int $message_code , int $bytes_transferred , int $bytes_max )

A callable function, used by the notification context parameter, called during an event.

Note:

This is not a real function, only a prototype of how the function should be.

Parameters

notification_code

One of the STREAM_NOTIFY_* notification constants.

severity

One of the STREAM_NOTIFY_SEVERITY_* notification constants.

message

Passed if a descriptive message is available for the event.

message_code

Passed if a descriptive message code is available for the event.

The meaning of this value is dependent on the specific wrapper in use.

bytes_transferred

If applicable, the bytes_transferred will be populated.

bytes_max

If applicable, the bytes_max will be populated.

Return Values

No value is returned.

Examples

Example #1 stream_notification_callback() example

<?php
function stream_notification_callback($notification_code$severity$message$message_code$bytes_transferred$bytes_max) {

    switch(
$notification_code) {
        case 
STREAM_NOTIFY_RESOLVE:
        case 
STREAM_NOTIFY_AUTH_REQUIRED:
        case 
STREAM_NOTIFY_COMPLETED:
        case 
STREAM_NOTIFY_FAILURE:
        case 
STREAM_NOTIFY_AUTH_RESULT:
            
var_dump($notification_code$severity$message$message_code$bytes_transferred$bytes_max);
            
/* Ignore */
            
break;

        case 
STREAM_NOTIFY_REDIRECTED:
            echo 
"Being redirected to: "$message;
            break;

        case 
STREAM_NOTIFY_CONNECT:
            echo 
"Connected...";
            break;

        case 
STREAM_NOTIFY_FILE_SIZE_IS:
            echo 
"Got the filesize: "$bytes_max;
            break;

        case 
STREAM_NOTIFY_MIME_TYPE_IS:
            echo 
"Found the mime-type: "$message;
            break;

        case 
STREAM_NOTIFY_PROGRESS:
            echo 
"Made some progress, downloaded "$bytes_transferred" so far";
            break;
    }
    echo 
"\n";
}

$ctx stream_context_create();
stream_context_set_params($ctx, array("notification" => "stream_notification_callback"));

file_get_contents("http://php.net/contact"false$ctx);
?>

The above example will output something similar to:

Connected...
Found the mime-type: text/html; charset=utf-8
Being redirected to: http://no.php.net/contact
Connected...
Got the filesize: 0
Found the mime-type: text/html; charset=utf-8
Being redirected to: http://no.php.net/contact.php
Connected...
Got the filesize: 4589
Found the mime-type: text/html;charset=utf-8
Made some progress, downloaded 0 so far
Made some progress, downloaded 0 so far
Made some progress, downloaded 0 so far
Made some progress, downloaded 1440 so far
Made some progress, downloaded 2880 so far
Made some progress, downloaded 4320 so far
Made some progress, downloaded 5760 so far
Made some progress, downloaded 6381 so far
Made some progress, downloaded 7002 so far

Example #2 Simple progressbar for commandline download client

<?php
function usage($argv) {
    echo 
"Usage:\n";
    
printf("\tphp %s <http://example.com/file> <localfile>\n"$argv[0]);
    exit(
1);
}

function 
stream_notification_callback($notification_code$severity$message$message_code$bytes_transferred$bytes_max) {
    static 
$filesize null;

    switch(
$notification_code) {
    case 
STREAM_NOTIFY_RESOLVE:
    case 
STREAM_NOTIFY_AUTH_REQUIRED:
    case 
STREAM_NOTIFY_COMPLETED:
    case 
STREAM_NOTIFY_FAILURE:
    case 
STREAM_NOTIFY_AUTH_RESULT:
        
/* Ignore */
        
break;

    case 
STREAM_NOTIFY_REDIRECTED:
        echo 
"Being redirected to: "$message"\n";
        break;

    case 
STREAM_NOTIFY_CONNECT:
        echo 
"Connected...\n";
        break;

    case 
STREAM_NOTIFY_FILE_SIZE_IS:
        
$filesize $bytes_max;
        echo 
"Filesize: "$filesize"\n";
        break;

    case 
STREAM_NOTIFY_MIME_TYPE_IS:
        echo 
"Mime-type: "$message"\n";
        break;

    case 
STREAM_NOTIFY_PROGRESS:
        if (
$bytes_transferred 0) {
            if (!isset(
$filesize)) {
                
printf("\rUnknown filesize.. %2d kb done.."$bytes_transferred/1024);
            } else {
                
$length = (int)(($bytes_transferred/$filesize)*100);
                
printf("\r[%-100s] %d%% (%2d/%2d kb)"str_repeat("="$length). ">"$length, ($bytes_transferred/1024), $filesize/1024);
            }
        }
        break;
    }
}

isset(
$argv[1], $argv[2]) or usage($argv);

$ctx stream_context_create();
stream_context_set_params($ctx, array("notification" => "stream_notification_callback"));

$fp fopen($argv[1], "r"false$ctx);
if (
is_resource($fp) && file_put_contents($argv[2], $fp)) {
    echo 
"\nDone!\n";
    exit(
0);
}

$err error_get_last();
echo 
"\nErrrrrorr..\n"$err["message"], "\n";
exit(
1);
?>

Executing the example above with: php -n fetch.php http://no2.php.net/get/php-5-LATEST.tar.bz2/from/this/mirror php-latest.tar.bz2 will output something similar too:

Connected...
Mime-type: text/html; charset=utf-8
Being redirected to: http://no2.php.net/distributions/php-5.2.5.tar.bz2
Connected...
Filesize: 7773024
Mime-type: application/octet-stream
[========================================>                                                           ] 40% (3076/7590 kb)

Коментарии

A couple of notes regarding the examples here (I'm using PHP 7.0.18):

1) fopen() did not provide STREAM_NOTIFY_PROGRESS for me but `file_get_contents()` worked fine.

2) The bytes transferred when transferring a zip file seems to always be shy by 8192 (8k).  This varies depending on filetype and also breaks STREAM_NOTIFY_PROGRESS when the filesize is below 8k.  I modified the function and it's now displaying the correct amount transferred and percentage downloaded on zip files above 8k.  I'm not sure why the callback is so inconsistent but hopefully this is helpful to someone.  This was also modified to only display progress:

<?php

$ctx 
stream_context_create();
stream_context_set_params($ctx, array("notification" => "stream_notification_callback"));
$fileData = @file_get_contents('http://example.com/test.zip',false,$ctx);

function 
stream_notification_callback($notification_code$severity$message$message_code$bytes_transferred$bytes_max) {
    static 
$filesize null;
    switch(
$notification_code) {
    case 
STREAM_NOTIFY_FILE_SIZE_IS:
       
$filesize $bytes_max;
        break;
    case 
STREAM_NOTIFY_CONNECT:
        echo 
"Connected...\n";
        break;
    case 
STREAM_NOTIFY_PROGRESS:
        if (
$bytes_transferred && $filesize >= 8192) {
           
$bytes_transferred += 8192;
            if (!isset(
$filesize)) {
               
printf("\rUnknown filesize.. %2d kb done.."$bytes_transferred/1024);
            } else {
               
$length = (int)(($bytes_transferred/$filesize)*100);
               
printf("\r[%-100s] %d%% (%2d/%2d kb)"str_repeat("="$length). ">"$length, ($bytes_transferred/1024), $filesize/1024);
            }
        }
        break;
    }
}
?>
2017-06-17 01:58:32
http://php5.kiev.ua/manual/ru/function.stream-notification-callback.html
Автор:
A couple of unreported behaviors:
- case 1) if this callback calls die/exit($msg), it will print $msg, then the execution will go on until the request/wrapper is consumed, emitting a "PHP Warning: Failed to call user notifier" on each invocation of the callback. After the last callback invocation, the script is immediately terminated.
- case 2) if this callback throws an exception, it will behave the same way as exit/die, except for the fact that after the last callback invocation it does not terminate the script. The exception is instead raised in the scope of the request/wrapper, and can be caught with a try catch (right there or at a higher level).

Example code for case 1). The final "TEST ECHO" string will NOT be printed.
<?php
$context 
stream_context_create(['http' => ['ignore_errors' => true,]]);
stream_context_set_params($context, ['notification' => function () {
    die(
'error');
}]);

file_get_contents('https://www.google.com'false$context);
echo 
"TEST ECHO";
?>

Example code for case 2). The exception is raised at the level of the file_get_contents call, it's catched, and the final "TEST ECHO" gets printed.
<?php
$context 
stream_context_create(['http' => ['ignore_errors' => true,]]);
stream_context_set_params($context, ['notification' => function () {
    throw new 
Exception('...');
}]);

try{
   
file_get_contents('https://www.google.com'false$context);
}catch(
exception $e) { }
echo 
"TEST ECHO";
?>
2022-11-29 17:51:36
http://php5.kiev.ua/manual/ru/function.stream-notification-callback.html

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