Logical Operators


AND   Are both values true? e.g $variable AND $variable2


 


if ($username =='user' AND $password =='password')


{
   echo "Welcome user";
}
else


{
   echo "Invalid Login Detected";
}


 


XOR   Is at least one value true,but NOT both? e.g $variable XOR $variable2


 


if ($username =='user' XOR $username =='user2')


{
   echo "Welcome ".$username;
}
else


{
   echo "Invalid Login Detected";
}


 


OR   Is at least one value true? e.g $variable OR $variable2


 


if ($username =='user' OR $username =='user2')


{
   echo "Welcome ".$username;
}
else


{
   echo "Invalid Login Detected";
}


 


!   Is NOT something e.g $variable

&&   Are both values true? e.g $variable && $variable2


 


if ($username =='user' && $password =='password')


{
   echo "Welcome user";
}
else


{
   echo "Invalid Login Detected";
}


 


||   Is at least one value true? e.g $variable || $variable2


 


if ($username =='user' || $username =='user2')


{
   echo "Welcome ".$username;
}
else


{
   echo "Invalid Login Detected";
}


                    

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