PHP警告：PHP启动：无法加载动态库'pdo_mysql.so'

Question

我运行了命令：

php -v

输出：

PHP Warning:  PHP Startup: Unable to load dynamic library 'pdo_mysql.so' (tried: /usr/lib/php/20170718/pdo_mysql.so (/usr/lib/php/20170718/pdo_mysql.so: undefined symbol: mysqlnd_allocator), /usr/lib/php/20170718/pdo_mysql.so.so (/usr/lib/php/20170718/pdo_mysql.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

我运行了此命令：

php -m

输出：

PHP Warning:  PHP Startup: Unable to load dynamic library 'pdo_mysql.so' (tried: /usr/lib/php/20170718/pdo_mysql.so (/usr/lib/php/20170718/pdo_mysql.so: undefined symbol: mysqlnd_allocator), /usr/lib/php/20170718/pdo_mysql.so.so (/usr/lib/php/20170718/pdo_mysql.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
    [PHP Modules]
    bz2
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    Core
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    curl
    date
    dom
    exif
    fileinfo
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    ftp
    gd
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    iconv
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    json
    libxml
    mbstring
    openssl
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    PDO
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    tokenizer
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    xml
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    xsl
    Zend OPcache
    zip
    zlib

    [Zend Modules]
    Zend OPcache

php.ini文件包含以下行：

extension=pdo_mysql

运行此命令：

sudo apt-get install -y php-pdo-mysql

没有安装任何东西，因为已经安装了。

运行此命令：

php -i

输出显示：

PDO

PDO support => enabled
PDO drivers =>

不确定这是为什么或做什么。有什么建议吗？

Answer 1

确保pdo_mysql.so文件的位置与PHP extension_dir的位置相同：

# php -i|grep extension_dir

# find / -name pdo_mysql.so