How to pass string into if condition statement in php?

Question

I have stored conditions in database string format. ex: ((25>1)||(25<1)) How can I pass this string to if condition statement. I tried, but it's not working. I have used eval() function, but it's not working.

$con=eval("return ((25>1)||(25<1))");
if($con){
    echo "success";
}
else{
    echo "failed";
}

Parse error: syntax error, unexpected end of file, expecting ';' : eval()'d code on line 1 — AbraCadaver
– AbraCadaver, Commented Apr 11, 2019 at 14:32
$con=eval("return ((25>1)||(25<1));"); sandbox.onlinephpfunctions.com/code/… — executable
– executable, Commented Apr 11, 2019 at 14:34
@AbraCadaver sorry i forgot to add semicolon inside of eval <?php $con=eval("return ((25>1)||(25<1));"); if($con){ echo "success"; } else{ echo "failed"; } ?> — siva.picky
– siva.picky, Commented Apr 11, 2019 at 14:37
@AbraCadaver my doubt instead of eval any alternative is their? — siva.picky
– siva.picky, Commented Apr 11, 2019 at 14:39
OK, then decode it. You keep commenting things that should be in your question. — AbraCadaver
– AbraCadaver, Commented Apr 11, 2019 at 14:59

PrakashG · Accepted Answer · 2019-04-11 15:01:57Z

1

You can do like this as well:

echo (25 > 1 ? "success" : ( 25 < 1 ? "success" : "failed")) ;

answered Apr 11, 2019 at 15:01

PrakashG

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1 Comment

siva.picky Over a year ago

this conditional statement okay. but my question is how to convert string ex: ((25>1)||(25<1)) this directly pass to if condition, i tried now eval worked but most of say eval is not safe so i try finding any other alternative, do you know something alternative for this?

Miroslav Glamuzina · Accepted Answer · 2019-04-11 14:59:25Z

0

You are missing a semicolon in your eval(). Strings passed into eval() still must be valid PHP, which will need an ;.

$con = eval('return ((25>1)||(25<1));');
if($con) {
    echo 'success';
} else {
    echo 'failed';
}

edited Apr 11, 2019 at 14:59

answered Apr 11, 2019 at 14:57

Miroslav Glamuzina

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5 Comments

siva.picky Over a year ago

This working thanks!. is that any alternate for eval?

Miroslav Glamuzina Over a year ago

Why would you need an alternative?

siva.picky Over a year ago

because i searched most of say don't use eval .

Miroslav Glamuzina Over a year ago

I've found some different ways to do it from this post, is this what you are looking for? stackoverflow.com/a/17700065/5066625

Manuel Mannhardt Over a year ago

Using eval isn´t a good thing, but as long as there is no (un-validated) user input, it´s fine security wise.

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