Extention mcrypt is deprecated in 7.1 and removed in 7.2.
Deprecated features in PHP 7.1.x
ext/mcrypt
The mcrypt extension has been abandonware for nearly a decade now, and was also fairly complex to use. It has therefore been deprecated in favour of OpenSSL, where it will be removed from the core and into PECL in PHP 7.2.
Eval option for mb_ereg_replace() and mb_eregi_replace()
The e pattern modifier has been deprecated for the mb_ereg_replace() and mb_eregi_replace() functions.
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