# shmop_size

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

shmop_size — Get size of shared memory block

### 说明

shmop_size ( resource `$shmid` ) : int

shmop_size() is used to get the size, in bytes of the shared memory block.

### 参数

`shmid`

  The shared memory block identifier created by shmop_open()

### 返回值

Returns an int, which represents the number of bytes the shared memory block occupies.

### 更新日志

版本 | 说明
--- | ---
7.0.0 | The type of `shmid` has been changed from int to resource.

### 范例

Example #1 Getting the size of the shared memory block

    <?php
    $shm_size = shmop_size($shm_id);
    ?>

This example will put the size of shared memory block identified by $shm_id into $shm_size.