Php/docs/sem.resources
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资源类型
Prior to PHP 8.0.0, this extension defined the resource types
sysvmsg queue (System V Message Queue),
sysvsem (System V Semaphore) and
sysvshm (System V Shared Memory).
Prior to PHP 8.0.0, this extension defined the resource types
sysvmsg queue (System V Message Queue),
sysvsem (System V Semaphore) and
sysvshm (System V Shared Memory).