Description:
------------
in array return true if I am checking 0 var

if $var=0;  result is wrong

int(0)
in_array IS TRUE
bool(true)

$var=(int) 1-1; result is wrong;

int(0)
in_array IS TRUE
bool(true)

if $var=1;  result is current


int(1)
in_array IS FALSE
bool(false)


if $var=NULL;  result is current


NULL
in_array IS FALSE
bool(false)


if $var='';  result is current


string(0) ""
in_array IS FALSE
bool(false)


Test script:
---------------
<?php
$array=['users','documents','timePunch','vacation','requests'];
$var=0;
if(in_array($var,$array)){
	echo 'in_array IS TRUE';
}
else{
	echo 'in_array IS FALSE';
}
echo PHP_EOL;
var_dump(in_array($var,$array));

Expected result:
----------------
in_array IS FALSE
bool(false)


Actual result:
--------------
in_array IS TRUE
bool(true)