Which is a better way to check if an array has more than one element

Question

I just need to check if an array has more than one element   I am trying to do it this way    if  isset  arr  1       the other traditional way is   if  sizeof  arr  gt 1    Which of the two is better  In such situaions  how should I judge between two alternate methods  Is there any performance check meter available to measure which is better

User · Answer

For checking an array empty   is better than sizeof     If the array contains huge amount of data  It will takes more times for counting the size of the array  But checking empty is always easy     for empty   if  empty  array        echo  Data exist     else       echo  No data        for sizeof  if sizeof  array  gt 1        echo  Data exist    else      echo  No data

User · Answer

The first method if  isset  arr  1     will not work on an associative array   For example  the following code displays  Nope  not more than one     arr   array       a    gt   apple        b    gt   banana       if  isset  arr  1           echo  Yup  more than one      else       echo  Nope  not more than one

User · Answer

Use this  if  sizeof  arr   gt  1                  Or   if  count  arr   gt  1                  sizeof   is an alias for count    they work the same   Edit  Answering the second part of the question  The two lines of codes in the question are not alternative methods  they perform different functions  The first checks if the value at  arr  1   is set  while the second returns the number of elements in the array

User · Answer

I assume  arr is an array then this is what you are looking for  if   sizeof  arr   gt  1

User · Answer

Obviously using count  arr   gt  1  sizeof is just an alias for count  is the best solution  Depending on the structure of your array  there might be tons of elements but no  array  1   element

User · Answer

if is array  arr   amp  amp  count  arr   gt  1   Just to be sure that  arr is indeed an array   sizeof is an alias of count  I prefer to use count because    1 less character to type sizeof at a quick glance might mean a size of an array in terms of memory  too technical

User · Answer

isset   only checks if a variable is set   Has got nothing to do with size or what the array contains

User · Answer

if  count  arr   gt   2         array has at least 2 elements     sizeof   is an alias for count    Both work with non-arrays too  but they will only return values greater than 1 if the argument is either an array or a Countable object  so you re pretty safe with this

User · Answer

I prefer the count   function instead of sizeOf   as sizeOf   is only an alias of count   and does not mean the same in many other languages  Many programmers expect sizeof   to return the amount of memory allocated

User · Answer

Use count    if  count  my array   gt  1       do     this page explains it pretty well http   phparraylength com

User · Answer

I do my array looping and getting filled defaults accordingly in Swift 4 5     for index in 0   lt 3               let isIndexValid   allObjects indices contains index          var yourObject Class   Class           if isIndexValid   yourObject   allObjects index           resultArray append yourObject

[php] Which is a better way to check if an array has more than one element?

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