How to check if a string is one of the known values?

Question

Suppose I have the code above, how to write th

Answer 1

There is in_array function.

if(in_array($a, array('are','abc','xyz','lmn'), true)){
   echo 'true';
}

NOTE: You should set the 3rd parameter to true to use the strict compare.

in_array(0, array('are','abc','xyz','lmn')) will return true, this may not what you expected.