Urgent !!! Memcache: addserver () The last parameter. Why do I return false no matter how many parameters are set?

{Code...} is printed as FALSE, but the following two connection methods are normal. Why? Do you know? {Code ...}

$ Mem = new Memcache; $ mem-> addserver ('2017. 0.0.1 ', '000000', true, 11211, 1, true, null, 10000); $ a = $ mem-> set ('key _ arr1', array, 5), 0, 0); var_dump ($ a); $ val = $ mem-> get ('key _ arr1 '); var_dump ($ val );

The print method is FALSE, but the following two connection methods are normal. Why? Do you know?

$ Mem-> connect ('192. 0.0.1 ', 127); $ mem-> addserver ('10. 10.3.2', '123', true, 1, 11211 );

Reply content:

$ Mem = new Memcache; $ mem-> addserver ('2017. 0.0.1 ', '000000', true, 11211, 1, true, null, 10000); $ a = $ mem-> set ('key _ arr1', array, 5), 0, 0); var_dump ($ a); $ val = $ mem-> get ('key _ arr1 '); var_dump ($ val );

The print method is FALSE, but the following two connection methods are normal. Why? Do you know?

$ Mem-> connect ('192. 0.0.1 ', 127); $ mem-> addserver ('10. 10.3.2', '123', true, 1, 11211 );