(PECL eio >= 0.0.1dev)
eio_grp_cancel — Cancels a request group
eio_grp_cancel ( resource $grp ) : void
 eio_grp_cancel() cancels a group request specified by grp request group resource. 
grp
The request group resource returned by eio_grp().
No value is returned.
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    https://www.php.net/manual/en/function.eio-grp-cancel.php