(PHP 5 >= 5.2.0, PHP 7, PHP 8)
stream_notification_callback — A callback function for the notification context parameter
$notification_code,$severity,$message,$message_code,$bytes_transferred,$bytes_maxA callable function, used by the notification context parameter, called during an event.
注意:
This is not a real function, only a prototype of how the function should be.
notification_code
One of the STREAM_NOTIFY_* notification constants.
severity
One of the STREAM_NOTIFY_SEVERITY_* notification constants.
messagePassed if a descriptive message is available for the event.
message_codePassed 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.
没有返回值。
示例 #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, $ctx);
?>以上示例的输出类似于：
Connected... Found the mime-type: text/html; charset=utf-8 Being redirected to: http://no.php.net/contact Connected... Got the filesize: 0 Found the mime-type: text/html; charset=utf-8 Being redirected to: http://no.php.net/contact.php Connected... Got the filesize: 4589 Found the mime-type: text/html;charset=utf-8 Made some progress, downloaded 0 so far Made some progress, downloaded 0 so far Made some progress, downloaded 0 so far Made some progress, downloaded 1440 so far Made some progress, downloaded 2880 so far Made some progress, downloaded 4320 so far Made some progress, downloaded 5760 so far Made some progress, downloaded 6381 so far Made some progress, downloaded 7002 so far
示例 #2 Simple progressbar for commandline download client
<?php
function usage($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)