减少所有可能性的条件数

Question

Here is my code to check the number of possible conditions for two elements, Is there a way to reduce the number of checking conditions (not any specific rule for checking).

Why i am asking is, I fear that if I add an additional element it will maximise the checking conditions in a vast manner.

How can I do this?

Here is my code:

<?php
$A = 'alpha';
$B = 'beta';

$result = '';

if($A != '' && $B !='')  
{
    $result .= 'Both has Value';
    // both contains value
}
elseif($A != '' && $B =='')
{
    $result .= 'Only A';
     // only a contains value
}
elseif($A == '' && $B !='') 
{
    $result .= 'Only A';
    // only b contains value
}
else 
{
    $result .= 'Both are Empty';
    // both contains no value
}

echo $A.' - '.$B.'<br>';
echo $result;
?>

Answer 1

Try this...

<?php

$a="123";
$b="";
$c="33";
$result="";
if($a !="")
{
if($result=="")
{
$result .="a"; //Get value $a only
} else {

$result .=" and a"; //Get  value $a with $b or $c    
}
}
if($b !="" )
{
if($result=="")
{
$result .="b"; //Get value $b only
} else {

$result .=" and b"; //Get  value $b with $a or $c    
}
}
if($c !="")
{
if($result=="")
{
$result .="c";  //Get value $c only
} else {

$result .=" and c"; //Get  value $c with $b or $a   
}
}
echo $result;
?>