A preliminary study on php shared memory shmop

First go to the reading and writing program:

<?php
/**
  * SHMOP共享内存操作示例
  * @author monkee
 **/
$key = 0x4337b700;
$size = 4096;
$shmid = @shmop_open($key, &#39;c&#39;, 0644, $size);
if($shmid === FALSE){
	exit(&#39;shmop_open error!&#39;);
}

$data = &#39;世界，你好！我将写入很多的数据，你能罩得住么？&#39;;

$length = shmop_write($shmid, pack(&#39;a*&#39;,$data), 0);
if($length === FALSE){
	exit(&#39;shmop_write error!&#39;);
}

@shmop_close($shmid);

exit(&#39;succ&#39;);
?>

Read:

<?php
/**
  * SHMOP共享内存操作示例
  * @author monkee
 **/
$key = 0x4337b700;
$size = 256;
$shmid = @shmop_open($key, &#39;c&#39;, 0644, $size);
if($shmid === FALSE){
	exit(&#39;shmop_open error!&#39;);
}

$data = unpack(&#39;a*&#39;, shmop_read($shmid, 0, 256));
if($data === FALSE){
	exit(&#39;shmop_read error!&#39;);
}
@shmop_close($shmid);

exit($data[1]);
?>

unix/linux command view:

key: the unique key value of the shared memory. The shared memory uses this key to determine which part you are reading. A piece of memory.

shmid: When using key to obtain memory, you get the value of this id. It serves as an identifier for the memory block you operate on.

owner: the user who created the shared memory block

perms: the read and write permissions of the shared memory, 8 is prohibited, can be 777, consistent with the read and write permissions of the file.

bytes: the size of the memory block

nattch: the number of processes connected to the memory block

status: current status, such as: dest, about to be deleted, etc.

The above has introduced a preliminary study on PHP shared memory shmop, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.