in_array returns true if needle is 0
76392
PHP in_array() / array_search() odd behaviour
103354
How do I test if an item is in a bash array?
4419
"is" operator behaves unexpectedly with integers
39485
Why does ('0' ? 'a' : 'b') behave different than ('0' == true ? 'a' : 'b')
139679
How can I check if an array contains a specific value in php?
37436
In PHP, 0 (int, zero) is equal to "first" or "last" (strings)?
90940
returning true outputs 1 but returning false outputs nothing
47961
\ifmmode doesn't seem to work correctly inside an array environment
75469
Why does Ruby's String#to_i sometimes return 0 when the string contains a number?
67428
How do I determine whether an array contains a particular value in Java?
27897
Array index out of bound behavior
138605
Why `Chop` does not make the real part of machine complex numbers an exact zero?
34580
FIND_IN_SET() vs IN()
138866
Convert an array of integers for use in a SQL "IN" clause
39459
Why is '' > 0 True in Python 2?
151096
Why does the expression 0 < 0 == 0 return False in Python?
97167
How do I determine if an array is initialized in VB6?