- islower()
- ctype_lower()
PHP
var_dump( ctype_lower('HELLO') ); # bool(false)
var_dump( ctype_lower('Hello') ); # bool(false)
var_dump( ctype_lower('hello') ); # bool(true)
Python
print( "hello".islower() ); # True
print( "Hello".islower() ); # False
print( "hello123".islower() ); # True