百科狗php_user_filter::filter() - php 流stream类
php_user_filter::filter()
(PHP 5, PHP 7)
Called when applying the filter
说明
publicphp_user_filter::filter(resource $in,resource $out,int &$consumed,bool $closing): intThis method is called whenever data is read from or written to the attached stream (such as withfread()orfwrite()).
参数
$in$inis a resource pointing to abucket brigadewhich contains one or morebucketobjects containing data to be filtered.
$out
$outis a resource pointing to a secondbucket brigadeinto which your modified buckets should be placed.
$consumed$consumed, which mustalwaysbe declared by reference, should be incremented by the length of the data which your filter reads in and alters. In most cases this means you will increment$consumedby$bucket->datalenfor each$bucket.
$closingIf the stream is in the process of closing (and therefore this is the last pass through the filterchain),the$closingparameter will be set toTRUE.
返回值
Thefilter()method must return one of three values upon completion.
| Return Value | Meaning |
|---|---|
PSFS_PASS_ON | Filter processed successfully with data available in the$outbucket brigade. |
PSFS_FEED_ME | Filter processed successfully, however no data was available to return. More data is required from the stream or prior filter. |
PSFS_ERR_FATAL(default) | The filter experienced an unrecoverable error and cannot continue. |
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