On Windows this function does not work with pipes opened with proc_open (https://bugs.php.net/bug.php?id=47918, https://bugs.php.net/bug.php?id=34972, https://bugs.php.net/bug.php?id=51800)
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
stream_set_blocking — Configure le mode bloquant d'un flux
stream_set_blocking() configure le mode bloquant
du flux stream.
Cette fonction fonctionne pour tous les flux qui supportent le mode non-bloquant (actuellement, les fichiers et les flux de sockets).
streamLe flux.
enable
Si enable vaut false,
stream sera configuré en mode non-bloquant,
et s'il vaut true, stream sera configuré en
mode bloquant. Cet appel affecte les fonctions telles que
fgets() et fread()
qui lisent dans des flux. En mode non-bloquant, la fonction
fgets() s'exécute juste après son appel, alors
qu'en mode bloquant, elle attendra des données.
Note:
Cette fonction est sans effet pour les fichiers locaux sous Windows. Le mode non-bloquant n'est pas supporté sous Windows.
On Windows this function does not work with pipes opened with proc_open (https://bugs.php.net/bug.php?id=47918, https://bugs.php.net/bug.php?id=34972, https://bugs.php.net/bug.php?id=51800)When you use fwrite() on a non-blocking stream, data isn't discarded silently as t dot starling said.
Remember that fwrite() returns an int, and this int represents the amount of data really written to the stream. So, if you see that fwrite() returns less than the amount of written data, it means you'll have to call fwrite() again in the future to write the remaining amount of data.
You can use stream_select() to wait for the stream to be available for writing, then continue writing data to the stream.
Non-blocking streams are useful as you can have more than one non-blocking stream, and wait for them to be available for writing.