## Basic usage

示例 #1 Shared Memory Operations Overview

    <?php

    // Create 100 byte shared memory block with system id of 0xff3
    $shm_id = shmop_open(0xff3, "c", 0644, 100);
    if (!$shm_id) {
        echo "Couldn't create shared memory segment\n";
    }

    // Get shared memory block's size
    $shm_size = shmop_size($shm_id);
    echo "SHM Block Size: " . $shm_size . " has been created.\n";

    // Lets write a test string into shared memory
    $shm_bytes_written = shmop_write($shm_id, "my shared memory block", 0);
    if ($shm_bytes_written != strlen("my shared memory block")) {
        echo "Couldn't write the entire length of data\n";
    }

    // Now lets read the string back
    $my_string = shmop_read($shm_id, 0, $shm_size);
    if (!$my_string) {
        echo "Couldn't read from shared memory block\n";
    }
    echo "The data inside shared memory was: " . $my_string . "\n";

    //Now lets delete the block and close the shared memory segment
    if (!shmop_delete($shm_id)) {
        echo "Couldn't mark shared memory block for deletion.";
    }
    shmop_close($shm_id);

    ?>

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