Write data into shared memory block

# shmop_write

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

shmop_write — Write data into shared memory block

### Description

shmop_write(Shmop `$shmop`, string `$data`, int `$offset`): int

shmop_write() will write a string into shared memory block.

### Parameters

`shmop`
  The shared memory block identifier created by shmop_open()
`data`
  A string to write into shared memory block
`offset`
  Specifies where to start writing data inside the shared memory segment. The offset must be greater than or equal to zero and less than or equal to the actual size of the shared memory segment.

### Return Values

The size of the written `data`.

### Errors/Exceptions

If `offset` is out of range, or a read-only shared memory segment should be written to, a ValueError is thrown.

### Changelog

Version | Description
--- | ---
8.0.0 | Prior to PHP 8.0.0, `false` was returned on failure.
8.0.0 | `shmop` expects a Shmop instance now; previously, a resource was expected.

### Examples

Example #1 Writing to shared memory block

`<?php
$shm_bytes_written = shmop_write($shm_id, $my_string, 0);
?>`

This example will write data inside `$my_string` into shared memory block, `$shm_bytes_written` will contain the number of bytes written.

### See Also

- shmop_read() - Read data from shared memory block

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