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, Jun 09 '15 at 14:27
You would have to use `evil()` or write some switch statements. But why do you want to do this? — Rizier123, Jun 09 '15 at 14:28
@JayBlanchard $allrule is string but i want this will run as a conditional statement. — Priye Ranjan, Jun 09 '15 at 14:43

score 3 · Accepted Answer · edited May 23 '17 at 11:43

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 '17 at 11:43

Community

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answered Jun 09 '15 at 14:42

Drakes

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Provided solution is working fine but it return parse error. Parse error: syntax error, unexpected ')' – Priye Ranjan Jun 09 '15 at 14:51
What is your real $allrule? It might have an extra parentheses. – Drakes Jun 09 '15 at 14:57
@Darkes My real $allrule = "(1433861812 > 1433694000) && (1433861812 > 1433771400) && (1433861812 > 1433944200)"; – Priye Ranjan Jun 09 '15 at 14:59
@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)" – Priye Ranjan Jun 09 '15 at 16:19
Hello @RanjanKumar, I've added your allrule to my answer. Your allrule parses properly. (Please pardon the delay in my responding) – Drakes Jun 10 '15 at 02:38
1

Thank You so much for your help @Darkes. – Priye Ranjan Jun 10 '15 at 10:25

Convert string to variable in PHP

1 Answers1