Почему жировые указатели иногда просачиваются наружу?

Сначала узнайте свою версию PHP. В моем случае 5.6.

php --version

PHP 5.6.27 (cli) (built: Oct 15 2016 21:31:59) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

Затем:

sudo yum search mcrypt

И выберите лучший один для вашей версии из списка, я использовал php56w-mcrypt.

  $ sudo yum search mcrypt
  Loaded plugins: fastestmirror
  Loading mirror speeds from cached hostfile

  ..... output truncated ....

libmcrypt-devel.i686 : Development libraries and headers for libmcrypt
libmcrypt-devel.x86_64 : Development libraries and headers for libmcrypt
libtomcrypt-devel.i686 : Development files for libtomcrypt
libtomcrypt-devel.x86_64 : Development files for libtomcrypt
libtomcrypt-doc.noarch : Documentation files for libtomcrypt
php-mcrypt.x86_64 : Standard PHP module provides mcrypt library support
php55w-mcrypt.x86_64 : Standard PHP module provides mcrypt library support

# either of these are fine:
php56-php-mcrypt.x86_64 : Standard PHP module provides mcrypt library support
php56w-mcrypt.x86_64 : Standard PHP module provides mcrypt library support

php70-php-mcrypt.x86_64 : Standard PHP module provides mcrypt library support
php70w-mcrypt.x86_64 : Standard PHP module provides mcrypt library support
php71-php-mcrypt.x86_64 : Standard PHP module provides mcrypt library support
libmcrypt.i686 : Encryption algorithms library
libmcrypt.x86_64 : Encryption algorithms library
libtomcrypt.i686 : A comprehensive, portable cryptographic toolkit
libtomcrypt.x86_64 : A comprehensive, portable cryptographic toolkit
mcrypt.x86_64 : Replacement for crypt()
```

Наконец:

sudo service httpd restart