How to use if condition inside string in php

Question

I want to know if there is a way to use something like this:

$t1=1;
$t2=2;
$t3="$t1>$t2";

if($t3)
   echo "Greater";
else
   echo "Smaller";

This will evaluate to true as $t3 is a string, but that's wrong!!!

So is there a way to include the if condition inside string.

I heard that we can use eval for this: PHP - if condition inside string

But how is this possible???

look on the answer in the link you attached , this is exactly the same example eval() — Haim Evgi
– Haim Evgi, Commented Sep 21, 2010 at 5:26
Why not if ($t1 > $t2) echo "Greater" else echo "Smaller"? — NullUserException
– NullUserException, Commented Sep 21, 2010 at 5:27
sample included in the link was not working for me So, I thought of asking it again!!! — sreejith
– sreejith, Commented Sep 23, 2010 at 4:30

BoltClock · Accepted Answer · 2010-09-21 05:30:50Z

3

For that, you don't need to evaluate a string. Just write it as a raw condition, and it'll give you a boolean which you can evaluate as is in the if condition:

$t3 = $t1 > $t2;

By the way, the else in your code will evaluate if $t1 and $t2 are equal. You can use an else if to take care of that, but it's just something I thought I'd point out.

edited Sep 21, 2010 at 5:30

answered Sep 21, 2010 at 5:25

BoltClock

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2 Comments

Jacob Relkin Over a year ago

OP specifically wants it to be in a string,.

sreejith Over a year ago

Thanks, you are correct, an else if will be better, I wrote it as a general rule.

Will A · Accepted Answer · 2010-09-21 05:29:14Z

1

This looks like it should work, given the PHP eval page.

$t1=1;
$t2=2;
$t3="return $t1>$t2;";

if(eval($t3))
   echo "Greater";
else
   echo "Smaller";

answered Sep 21, 2010 at 5:29

Will A

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Comments

Your Common Sense · Accepted Answer · 2010-09-21 05:26:51Z

-1

Most likely you don't heed that and this question come out from bad design.
Why not to make it just

if ($t1>$t2) echo "greater";

answered Sep 21, 2010 at 5:26

Your Common Sense

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1 Comment

sreejith Over a year ago

I decided to use eval() which seems to be the better solution.

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