/etc/php/7.0/mods-available/igbinary.ini is in php-igbinary 1.2.1-10-ge0e66b9+1.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | ; configuration for php igbinary module
; priority=20
; Load igbinary extension
extension=igbinary.so
; Use igbinary as session serializer
;session.serialize_handler=igbinary
; Enable or disable compacting of duplicate strings
; The default is On.
igbinary.compact_strings=On
; Use igbinary as serializer in APC cache (3.1.7 or later)
;apc.serializer=igbinary
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