Can I store boolean comparison in a string?
I am trying to modulate a long lasting function if..else
.
$condition = "$a < $b";
if($condition)
{
$c++;
}
Is there a way to translate a literal string into a boolean expression?
I am trying to make a modular long if..else function.
You don't need to put the condition on a string for this, just keep booleans true
or false
:
$condition = ($a < $b);
if($condition)
{
$c++;
}
the values of $ a and $ b can change between defining $ condition and using it
One solution would be closure (assuming the definition and use happens in the same scope):
$condition = function() use (&$a, &$b) {
return $a < $b;
}
$a = 1;
$b = 2;
if ($condition()) {
echo 'a is less than b';
}
But I don't know if this makes sense to you without remotely knowing what you are trying to accomplish.
Use a lambda if you know the variables that are sufficient to determine the result
$f = function ($a, $b) { return $a < $b; }
if ($f($x, $y)){}
you can do it using eval . not sure why you are not just evaluating this condition immediately.
<?php
$a=0;
$b=1;
function resultofcondition()
{
global $a,$b;
return $a<$b;
}
if(resultofcondition()){
echo " You are dumb,";
}else{
echo " I am dumb,";
}
$a=1;
$b=0;
if(resultofcondition()){
echo " You were correct.";
}else{
echo " in your face.";
}
?>
Indeed, thanks for commenting this out, the GLOBAL parameter was missing, for those who voted, what would this code output? ¬_¬ w / e have fun xD