Eval php expression from MySQL database

[muscailie]

Hello

How do I store a simple code like this : if ($variable) echo "variable set"; else echo "variable not set"; in a database and then have it executed in a php file..

I know I have to use eval(), but i receive a lot of string errors and also a very ambigous one : unexpected T_IF although the syntax is correct.

Thanks!

[Kastro187420]

If you were using the above format for your If Statmement, that syntax is wrong, because your leaving out the brackets: { } . Thats why your getting that unexpected error I think. Either that, or its the line just before your if statement thats giving you the error. Most likely a parse error.

[laserlight]

How do I store a simple code like this : if ($variable) echo "variable set"; else echo "variable not set"; in a database and then have it executed in a php file..

You can store it as a string. However, I do warn against such use of eval() as it could lead to malicious code being executed.

I know I have to use eval(), but i receive a lot of string errors and also a very ambigous one : unexpected T_IF although the syntax is correct.

.
If you are mixing it with HTML code, then you would need to use the PHP start/end tags to differentiate it from the non-PHP code.

If you were using the above format for your If Statmement, that syntax is wrong, because your leaving out the brackets: { } .

That is fine. Leaving out braces where the statement that follows is the entire block is perfectly valid syntax. I do not recommend it as it can be more error prone, but this depends on the situation (and personal taste and carelessness).

[dugindog]

// Will display so ensure this line is where you want it at!
eval('?>' . $conten . '<?php ');

but again be careful in use, malicius code can be fed thru without proper filtering.

[muscailie]

what about the code stored in the database? do I have to escape the quotes?

[muscailie]

i found eval() very useful for making dynamic meta tags.. i have a template file which displays a list of items.. the same template checks for an ID and if it's set , it will display only one item..

so using eval() i'm checking for the presence of that ID, thus altering the meta tags .. i'm not doing this in the main template file, because the template file is used for all the generated files in the site..