"Many PHP developers believe that because standard PHP lacks
threading capabilities, it's impossible for a practical PHP
application to multitask. For example, if an application needs
information from a different Web site, it has to stall until that
remote retrieval is done. Not true! Find out about in-process PHP
multitasking using stream_select and stream_socket_client.
"PHP does not support threading. Despite this, and in contrast
to what most PHP developers with whom I've spoken believe, PHP
applications can multitask. Let's start with as clear a picture as
possible of what 'multitasking' and 'threading' mean for PHP
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