Executing a string in PHP

Question

I have a requirement where I have some conditions saved in DB. I am able to bring those conditions via my PHP code, But I am not able to execute them. I have shown one example below.

<? 

$z = ">100";//I get this value from the DB
$x = 80; // This value also comes from DB

if(exec("&1 &2",$x,$z))
  echo "Yes";
else
  echo "No";
?>

Also tried This

<? 

$z = ">100";
$x = 80;
if(eval("$x $z"))
  echo "Yes";
else
  echo "No";
?>

exec() is meant for shell commands. eval() runs dynamic code. — mario
– mario, Commented Aug 25, 2015 at 3:06
Not to be a troll, but remember, "If eval() is the answer, you're almost certainly asking the wrong question." -- Rasmus Lerdorf, BDFL of PHP — Geoherna
– Geoherna, Commented Aug 25, 2015 at 3:16
I get this error. Parse error: syntax error, unexpected '=' in E:\wamp\www\test\test.php(3) : eval()'d code on line 1 — Karthik Rajagopalan
– Karthik Rajagopalan, Commented Aug 25, 2015 at 3:44

Dimag Kharab · Accepted Answer · 2015-08-25 04:31:26Z

1

It should be, ( eval only accepts statements, not expressions)

$z = ">100";//I get this value from the DB
$x = 80; // This value also comes from DB


if(eval("return {$x} {$z};"))
  echo "Yes";
else
  echo "No";
?>

answered Aug 25, 2015 at 4:31

Dimag Kharab

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