stream_notification_callback

(PHP 5 >= 5.2.0)

stream_notification_callback — A callback function for the notification context parameter

说明

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.

参数

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.

返回值

没有返回值。

范例

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 );
 ?>

以上例程的输出类似于：

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)

参见

Context 参数

用户评论:

[#1] recycling dot sp dot am at gmail dot com [2010-09-10 05:08:15]

Please note that the callback function never gets called when the stream is (at least) of type socket. It is probably the same for the file:// proto although I've not done further tests.

I'm using php 5.3.3.