PHP determines whether an array contains the value of another array

in_array() function
Briefly ：in_array($needle, $array[, $strict = FALSE])
Altogether 3 Parameters ,
The first parameter is the value to check （ the latter ）, It can be an array or a specific value .
The second parameter is the array to check （ The former ）, ditto .
The third one doesn't have to write , The default is false, It's written in true We have to compare whether the data types are the same .
I think the third one is very necessary . Sometimes there will be problems if you don't write .

Another basic usage is that an array contains a value , But if you want to include another array , Only when another array is a complete subarray of the original array , I tried some that should be like this . There are cases in the link at the beginning . Be sure to look at the case ！

		 if(in_array('SB',$params,true))
        {
    
            echo ' There are illegal characters ';
        }