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Check that pcntl_signal exists #88
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There are environments where
pcntl_signalis disabled inphp.inibut thepcntlextension itself is loaded. In these cases it is not enough to check that thepcntlextension is loaded. We must also check thatpcntl_signalexists.For example,
pcntl_signalis disabled by default on Debian and Ubuntu: https://www.apt-browse.org/browse/debian/jessie/main/amd64/php5-common/5.6.20+dfsg-0+deb8u1/file/usr/share/php5/php.ini-production