php - Can't use method return value in write context -

php - Can't use method return value in write context -

the next if status causing error:

if( !empty ($this -> session -> userdata( 'user_id') ) ) { $user_id = $this -> session -> userdata( 'user_id' ); } else { $error = "id doesn't exist"; }

i next error:

fatal error: can't utilize method homecoming value in write context in (line number)

how can prepare it?

replace first if statement if( ! $this->session->userdata('user_id') ).

the empty function check if variable empty userdata function. additionally, information, according codeigniter documentation, userdata function returns false if item doesn't exist, means if user_id doesn't exist in session, code in else executed.

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