I have an array ($myArray) which looks like this:
Array (
[0] => 2001
[1] => 2002
[2] => 2003
[3] => 2004
[4] => 2005
[5] => 2006
[6] => 2007
etc etc
When I use
$occurences = array_count_values($myArray)
I get
Array (
[2001] => 5
[2002] => 7
[2003] => 7
[2004] => 7
[2005] => 7
[2006] => 2
[2007] => 6 )
When I try to index using
echo $occurences[0];
I get an error of
Undefined offset: 0
try using foreach() if you want to loop over your ocurrences array :
foreach($occurences as $item) {
echo $item . '<br>';
}
but if you want only the first element, you could use reset($occurences)
reset() gives you the first value of the array if you have an element inside the array, it also gives you FALSE in case the array is empty.
The keys in the result of array_count_values are the values in the input array. So the [0] key you're looking for isn't there. You can see in the output
Array (
[2001] => 5
[2002] => 7
[2003] => 7 ...
that the first key is [2001].
If you want to get the first item, either explicitly refer to $occurrences[2001], or use
echo reset($occurrences);
instead if you don't know what the first year will be.
If you want more than just the first element, $occurrences can also be iterated with foreach.
foreach ($occurrences as $year => $count) { ...
There is no key name '0' in $occurences.
As you can see in the print_r of $occurences in your question, the keys of that array are the values from $myarray.
If you want to print the first value of $occurences, you should write :
echo $occurences['2001'];
If you read the array_count_values documentation it tells you that the function returns an associative array.
Returns an associative array of values from array as keys and their count as value.
So you cannot call the $occurences array like that.
So from what you explained above, you have the following:
<?php
$myarray = array (
0 => 2001,
1 => 2002,
2 => 2003,
3 => 2004,
4 => 2005,
5 => 2006,
6 => 2007 );
$occurences = array_count_values($myarray);
print_r($occurences);
This gives me the following:
Array ( [2001] => 1
[2002] => 1
[2003] => 1
[2004] => 1
[2005] => 1
[2006] => 1
[2007] => 1 )
Obviously, the values will differ as I guess you have a larger data set in $myarray.
If you want to get the value of each of the years, you would do echo $occurrences['2003']; which will give you back the value of the year.
