Description:
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When the third param for openssl_csr_new is not specified or empty, the default 
system config is used. If it could not be found, the code generating the private 
key is ommited and no warnings appear. On linux the default config path is set to 
usually existent file /usr/lib/ssl/openssl.cnf , on windows it's 
/usr/local/ssl/openssl.cnf which won't be found anyway. 

Test script:
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php -r "$a = array(); var_dump(openssl_csr_new(array(),$a,array(),array()));"

Expected result:
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Warning: openssl_csr_new(): key array must be of the form array(0 => key, 1 => 
phrase) in Command line code on line 1

Warning: openssl_csr_new(): add1_attr_by_txt challengePassword_min -> 4 (failed) 
in Command line code on line 1
bool(false)


Actual result:
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bool(false)