stream_notification_callback()

(PHP 5 >= 5.2.0, PHP 7)

A callback function for thenotificationcontext parameter

说明

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

Acallablefunction, used by thenotification context parameter, called during an event.

Note:

This isnota real function, only a prototype of how the function should be.

参数

$notification_code

One of theSTREAM_NOTIFY_*notification constants.

$severity

One of theSTREAM_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_transferredwill be populated.

$bytes_max

If applicable,the$bytes_maxwill be populated.

返回值

没有返回值。

范例

Example #1stream_notification_callback()example

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

Simple progressbar for commandline download client

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.bz2will 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

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.

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: 

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