shmop_write Write data into shared memory block intshmop_write intshmid stringdata intoffset shmop_write will write a string into shared memory block. shmop_write takes 3 parameters: shmid, which is the shared memory block identifier created by shmop_open, data, a string that you want to write into shared memory block and offset, which specifies where to start writing data inside the shared memory segment. ]]> This example will write data inside $my_string into shared memory block, $shm_bytes_written will contain the number of bytes written.