Scared to think about it? About the third parameter of in_array

Usein_array ()Determine whether there is a certain value in the array. If the third parameter is omitted, sometimes the result may be meaningless...

For example, the following Code snippet:

      
Changed toin_array('Hello', $arr, true)This problem can be solved
      
This problem does not exist in JS, for example, use The indexOf () function can be rewritten like this
      

      
I don’t know if this question will make you fall into silence→_→
      
Related recommendations: "PHP video tutorial》
      
The above is the detailed content of Scared to think about it? About the third parameter of in_array. For more information, please follow other related articles on the PHP Chinese website!