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    这里描述的 socket 函数只是 PHP 扩展的一部分，编译 PHP 时必须在 configure 中添加 --enable-sockets 配置项来启用。

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    seb at stiaan dot io
    7 years ago
    At the time of writing, most Linux distributions ship their PHP versions with sockets enabled by default.
    Tested distros/versions:

    CentOS 7, PHP 5.4: Enabled;
    CentOS 7, Remi repo, PHP 7.1.1: Enabled;
    CentOS 7, DirectAdmin Custombuild, PHP 7.0.9: Enabled;
    CentOS 7, DirectAdmin Custombuild, PHP 5.6.24: Enabled;
    Debian Jessie, PHP 5.6.30-0+deb8u1: Enabled;
    Gentoo Linux ~amd64, PHP 7.1.1: Enabled (USE-flag "sockets" is enabled by default)

    Alpine Linux: PHP 5.6.30: Disabled, however this can simply be enabled by installing php5-sockets

    I haven't tested other distros/versions, but as far as compatibility goes most systems seem to support sockets out of the box.
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