PHP/resource/stream: Difference between revisions
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**** 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>. | **** 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? | ||
**** I ''think'' we have to assume that this is true for <code>{{l/pfx|PHP/fx/|stream_get_contents}}()</code>: it will never return empty as long as the process is active. (Maybe in non-blocking mode, it blocks until there is at least one byte, or something?) | |||
*** 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? | ||
==Links== | ==Links== | ||
=== | ===Reference=== | ||
* [https://www.php.net/manual/en/ref.stream.php Stream Functions] | * [https://www.php.net/manual/en/ref.stream.php Stream Functions] | ||
Latest revision as of 01:36, 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?
- I think we have to assume that this is true for
Template:L/pfx(): it will never return empty as long as the process is active. (Maybe in non-blocking mode, it blocks until there is at least one byte, or something?)
- I think we have to assume that this is true for
- 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:
