[Solved] Are this if statements equal? [closed]

Question

Let us break it down.

isset($_SESSION['id']) == 1

The first part, the isset() call, will return a boolean value (true or false), depending on if the session id is set or not.

When you compare an integer value with a boolean value, using the == operator, the integer will be coerced (or cast/type-juggled) into a boolean value. So, if the integer is a “truthy” value, i.e. greater than or equal to 1, then it will be turned into true. If it is lower than or equal to 0 then it will be turned into false.

In other words, if the session is set then the expression will be turned into true === true (which evaluates to true). If it is not set then it will be turned into false === true (which evaluates to false).

So, in conclusion, it probably does not do what you thought it did. Use the latter if statement.

Accepted Answer

Let us break it down.

isset($_SESSION['id']) == 1

The first part, the isset() call, will return a boolean value (true or false), depending on if the session id is set or not.

When you compare an integer value with a boolean value, using the == operator, the integer will be coerced (or cast/type-juggled) into a boolean value. So, if the integer is a “truthy” value, i.e. greater than or equal to 1, then it will be turned into true. If it is lower than or equal to 0 then it will be turned into false.

In other words, if the session is set then the expression will be turned into true === true (which evaluates to true). If it is not set then it will be turned into false === true (which evaluates to false).

So, in conclusion, it probably does not do what you thought it did. Use the latter if statement.