IF（MAX（$ yourArray）小于5）{
  //在阵列中的所有值都小于5
}
 

Is there a function to do this?

For example if I have an array like 1,1,3,2,1,2,3,2,2,3,3,2,5,1 The function should return true if and only if all the numbers in the array are less than 5

if(max($yourArray) < 5) {
  //all values in array are less than 5
}