Convert string to variable in PHP

Question

I have a variable $allrule = '(1 == 2) && (2 == 2)'; when i check if($allrule), it returns true because $allrule is treated as string. So i want to convert $allrule as condition of if statement. how can we do it.

Convert it to what? $allrule is a variable containing the string '(1 == 2) && (2 == 2)'. — Jay Blanchard
– Jay Blanchard, Commented Jun 9, 2015 at 14:27
You would have to use evil() or write some switch statements. But why do you want to do this? — Rizier123
– Rizier123, Commented Jun 9, 2015 at 14:28

Community · Accepted Answer · 2017-05-23 11:43:57Z

3

This solution uses eval() which is pure evil, but since it wasn't stipulated not to do so...

$allrule = '(1 == 2) && (2 == 2)';
$result = eval("return (".$allrule.");"); // $result will be false

Expanded Example*:

$allrule = "(1433861812 > 1433694000) && (1433861812 > 1433771400) && (1433861812 > 1433944200)";

$result = eval("return (".$allrule.");");
if($result) {
    echo "true";
} else {
    echo "false"; // will echo "false"
}

*from comments

edited May 23, 2017 at 11:43

CommunityBot

11 silver badge

answered Jun 9, 2015 at 14:42

Drakes

23.8k3 gold badges58 silver badges97 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Priye Ranjan Over a year ago

Provided solution is working fine but it return parse error. Parse error: syntax error, unexpected ')'

Drakes Over a year ago

What is your real $allrule? It might have an extra parentheses.

Priye Ranjan Over a year ago

@Darkes My real $allrule = "(1433861812 > 1433694000) && (1433861812 > 1433771400) && (1433861812 > 1433944200)";

Priye Ranjan Over a year ago

@Darkes i modified it but it still gives me parse error; Can you provide the actual eval statement for provided string. $allrule = "(1433861812 > 1433694000) && (1433861812 > 1433771400) && (1433861812 > 1433944200)"

Drakes Over a year ago

Hello @RanjanKumar, I've added your allrule to my answer. Your allrule parses properly. (Please pardon the delay in my responding)

Collectives™ on Stack Overflow

Convert string to variable in PHP

1 Answer 1

5 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related