Function condition based on array length - php

Question

The title might sound... trivial, but i had no idea how to name this problem in one sentence.
I have different arrays of variables in different places in my file(s)
for example:
//set1:
$a =1;$b=2;$c=3;$d=4;$e=5;
$set1 =array($a,$b,$c,$d,$e);
//set2:
$x=1;$y=2;
$set2 =array($x,$y);
Im tryin' to write a function which makes different operations based on array length.
For (simplified) example, in first case I wanna execute:
if($set1[0]){/*something*/}
if($set1[0] || $set1[1]){}
if($set1[0] || $set1[1] || $set1[2]){}
if($set1[0] || $set1[1] || $set1[2] || $set1[3]){}
if($set1[0] || $set1[1] || $set1[2] || $set1[3] || $set1[4]){}
In second case, I wanna execute
if($set2[0]){}
if($set2[0] || $set2[1]){}
I tried to write function using eval(), and it works...
function _f($array)
{
$i =-1;
$x =count($array);
$str ='';
$str2 ='';
while(++$i < $x)
{
if($i ==0){
$str .="\$array[$i]";
} else {
$str .=" || \$array[$i]";
}
$str2 .="if(".$str."){\n echo 'lol'; \n}\n\n";
}
echo "<pre>";
echo $str2;
echo "</pre>";
eval($str2);
}
_f($set1);
//output: lollollollollol (as I expected)
...but is that solution safe when user can set the variables? Are there better solutions?

Answer 1

It is not entirely clear what the intention of your program is because of the limitations of the input data, as mentioned in comment above (all $array entries evaluate to true).
But the following sequence, which would replace your loop, would produce the same result as the evals:
$status = false;
while(++$i < $x) {
$status = $status || $array[$i];
if ($status) echo 'lol';
}