PHP/resource/stream: Difference between revisions
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* If a stream is set to blocking mode (with <code>{{l/pfx|PHP/fx/|stream_set_blocking}}({{arg|stream resource}}, TRUE);</code>), then EoS (end-of-stream) is indicated by the return of an empty string. | * If a stream is set to blocking mode (with <code>{{l/pfx|PHP/fx/|stream_set_blocking}}({{arg|stream resource}}, TRUE);</code>), then EoS (end-of-stream) is indicated by the return of an empty string. | ||
** Questions about how it works in non-blocking mode: | ** Questions about how it works in non-blocking mode: | ||
*** How do we detect EoS in ''non''-blocking mode? | *** How do we detect EoS in ''non''-blocking mode? Some tentative leads: | ||
**** [https://www.php.net/manual/en/stream.constants.php#constant.stream-notify-completed STREAM_NOTIFY_COMPLETED] ( | **** We could set the stream with an event-callback (see {{l/pfx|PHP/fx/|stream_notification_callback}}) and look for [https://www.php.net/manual/en/stream.constants.php#constant.stream-notify-completed STREAM_NOTIFY_COMPLETED] events. '''PROBLEM''': docs say this is only supported for http and ftp. | ||
**** Maybe <code>{{l/pfx|PHP/fx/|feof}}()</code> would work? '''PROBLEM''': although docs say this can be used on a stream, they also say it has to have been opened with <code>{{l/pfx|PHP/fx/|fopen}}()</code> or <code>{{l/pfx|PHP/fx/|fsockopen}}()</code>, which rules out process-fed streams created with functions like <code>{{l/pfx|PHP/fx/|ssh2_exec}}()</code>. | |||
*** Does empty-string still correctly signal that the process has completed? | *** Does empty-string still correctly signal that the process has completed? | ||
*** What happens if the process has ''not'' completed (so there's no new data yet) -- how can we tell that there might be more? | *** What happens if the process has ''not'' completed (so there's no new data yet) -- how can we tell that there might be more? | ||
Revision as of 01:29, 11 February 2026
About
Although there are a lot of functions that handle streams in PHP, how to properly use these functions is often not explained very well. I'm having to reverse-engineer a lot through trial and error.
Tentative Conclusions
- If a stream is set to blocking mode (with
Template:L/pfx(Template:Arg, TRUE);), then EoS (end-of-stream) is indicated by the return of an empty string.- Questions about how it works in non-blocking mode:
- How do we detect EoS in non-blocking mode? Some tentative leads:
- We could set the stream with an event-callback (see Template:L/pfx) and look for STREAM_NOTIFY_COMPLETED events. PROBLEM: docs say this is only supported for http and ftp.
- Maybe
Template:L/pfx()would work? PROBLEM: although docs say this can be used on a stream, they also say it has to have been opened withTemplate:L/pfx()orTemplate:L/pfx(), which rules out process-fed streams created with functions likeTemplate:L/pfx().
- Does empty-string still correctly signal that the process has completed?
- What happens if the process has not completed (so there's no new data yet) -- how can we tell that there might be more?
- How do we detect EoS in non-blocking mode? Some tentative leads:
- Questions about how it works in non-blocking mode:
