isset（）或！empty（）函数对视图中的所有变量有效吗？

Question

Hi I'm using CakePHP and I'm wondering do you guys puts isset() or !empty() around all of your variables in the views? Or should I depend on the data validation? What would be the suggested solution?

Answer 1

I think you should know the differences between isset and empty and use the one that fulfills your needs.

empty will return FALSE if the variable has a non-empty and non-zero value.

The following values are considered to be empty:

• "" (an empty string)
• 0 (0 as an integer)
• "0" (0 as a string)
• NULL
• FALSE
• array() (an empty array)
• var $var; (a variable declared, but without a value in a class)

On the other hand isset will return FALSE if the variable does not exist or has been unset with unset(), or the variable has been set to NULL.