How to generate dynamic IF statement

Question

I have array look like this.

$setLogic = array(array("Conj"=>null,"Topic"=>True),array("Conj"=>"Or","Topic"=>True),array("Conj"=>"Or","Topic"=>false),

I try to build a IF statement with the dynamicly with this way.

foreach($setLogic as $value){
   echo $value['Conj'].(int)$value['Topic'];

    if($value['Conj'].(int)$value['Topic'] == true){
         $getBoolean[] = true;
    }
    else{
         $getBoolean[] = false;
    }

I just need something like this.

(true or true or false) and return true or false

You want a sort of custom expression engine which evaluates what’s in the array structure. Not exactly the best approach with this array. Perhaps you want to look at existing expression engines like Symfony’s: https://symfony.com/doc/current/components/expression_language. — deceze, Mar 29 '19 at 08:13

score -1 · Accepted Answer · edited Mar 29 '19 at 09:18

-1

I found my answer with my self. It's look like this.

$abc= '';
foreach($setLogic2 as $key => $value){
    $abc.= $value['Conj'].' '.(int)$value['Topic'].' ';
}

//$abc = "0 And 1 And 1";

if(eval("return $abc;") == true) {
    echo 'true boolean';
}
else if(eval("return $abc;") == false){
    echo 'false boolean';
}
else{
    echo 'none';
}

edited Mar 29 '19 at 09:18

Andreas

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answered Mar 29 '19 at 09:16

BBBBeloved

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Please [don't use `eval`](https://stackoverflow.com/q/951373/476) unless you're really really really sure what you're doing… – deceze Mar 29 '19 at 09:19

elfif · Answer 2 · 2019-03-29T12:53:06.277

-2

Ok i will re formulate my answer....

You want to dynamically evaluate an array which contains for each subarray * a verb : "and" or "or" * a value "true or "false"

Quicker and most dirty way is to use eval(). * build your conditions as a string (replace "and" by "&&" and "or" by "||"

'true || true && false'

then put the result in a variable and evaluate

eval('$result = (true || true && false);');
var_dump($result);

This works for sure...

edited Mar 29 '19 at 12:53

answered Mar 29 '19 at 08:29

elfif

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What exactly is `$value['Conj'].(int)$value['Topic']` supposed to represent? – Jeto Mar 29 '19 at 08:38
I try to with new array $setLogic3 = array( array("Conj"=>null, "Topic"=>false), array("Conj"=>"And", "Topic"=>True), array("Conj"=>"And", "Topic"=>True), ) the answer must be false. – BBBBeloved Mar 29 '19 at 08:46

How to generate dynamic IF statement

2 Answers2