Simpler way to check if variable is not equal to multiple string values

Question

Current Codes    lt  php       See the AND operator  How do I simplify shorten this line    if   some variable      uk   amp  amp   some variable      in              Do something         gt    And    lt  php       See the OR operator  How do I simplify shorten this line    if   some variable      uk      some variable      in              Do something else         gt    Is there a simpler  i e  shorter  way to write the two conditions   NOTE  Yes  they are different  and I am expecting different ways to shorten the codes

User · Answer

An alternative that might make sense especially if this test is being made multiple times and you are running PHP 7+ and have installed the Set class is:

use Ds\Set;

$strings = new Set(['uk', 'in']);    
if (!$strings->contains($some_variable)) {

Or on any version of PHP you can use an associative array to simulate a set:

$strings = ['uk' => 1, 'in' => 1];
if (!isset($strings[$some_variable])) {

There is additional overhead in creating the set but each test then becomes an O(1) operation. Of course the savings becomes greater the longer the list of strings being compared is.

User · Answer

For your first code  you can use a short alteration of the answer given by    ShankarDamodaran using in array     if    in array  some variable  array  uk   in    true         or even shorter with    notation available since php 5 4 as pointed out by  Forty in the comments  if    in array  some variable    uk   in    true         is the same as   if    some variable      uk   amp  amp   some variable      in            but shorter  Especially if you compare more than just  uk  and  in    I do not use an additional variable  Shankar used  os  but instead define the array in the if statement  Some might find that dirty  i find it quick and neat  D  The problem with your second code is that it can easily be exchanged with just TRUE since   if  true      equals  if    some variable      uk      some variable      in        You are asking if the value of a string is not A or Not B  If it is A  it is definitely not also B and if it is B it is definitely not A  And if it is C or literally anything else  it is also not A and not B  So that statement always  not taking into account schr  dingers law here  returns true

User · Answer

You can make use of in array   in PHP    os   array  uk    us       You can set multiple check conditions here if  in array  uk    os     Founds a match         echo  Got you

User · Answer

If you re planning on building a function in the if statement  I d also advise the use of in array  It s a lot cleaner   If you re attempting to assign values to variables you can use the if else shorthand    variable to fill    some variable      uk    false   true

User · Answer

Some basic regex would do the trick nicely for  some variable      uk   amp  amp   some variable      in    if  preg match    uk in      some variable            Do something

User · Answer

You may find it more readable to reverse your logic and use an else statement with an empty if   if  some variable      uk      another variable      in      else          This occurs when neither of the above are true

User · Answer

You need to multi value check  Try using the following code     lt  php      illstack array                        val array  uk   bn   in        if count array intersect  illstack  val     count  val       all of  val is in  illstack    gt

[php] Simpler way to check if variable is not equal to multiple string values?

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