What is "eval"

val is a command that allows interpreting a code/expression given by a string (text) causing it to be executed as part of the code.

It is a fairly common function in script, such as Javascript and PHP.

There are security implications to using this feature, since if the data is coming from information saved in a database, where the user can manipulate, this can inject malicious code so that other users accessing this data have their system compromised.