Array position where new value starts

hi,

i have array $a contains id in different frequency, , sorted. want know "array position" id number changes. array given here result i'm looking - 0,4,9,12

array ($a):

1001
1001
1001
1001
1002
1002
1002
1002
1002
1003
1003
1003
1004
1004
1004

hi,

you can solve follow:

# multiline for($i = 0;$i -lt $a.count;$i++) {   if($a[$i] -ne $a[$i-1])   {     $i   } }  # oneliner for($i = 0;$i -lt $a.count;$i++){if($a[$i] -ne $a[$i-1]){$i}}

malte

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