10-07-2012
The versions of awk that I use (on OS X) don't have the asort() and asorti() functions, but I have read the gawk man page. Unlike the sort utility, there is no way to specify a sort key for these functions; they always sort the array using the entire contents of the string as the sort key. If you want to use asort() in gawk to sort with field 1 as your primary sort key and the second part of field 2 as your secondary key; you need to prepend each line in your array with primary and secondary sort fields, use asort() or asorti() to sort the modified records, and then strip off the added sort fields when you print (or otherwise process) the results.
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ASORT(3) 1 ASORT(3)
asort - Sort an array and maintain index association
SYNOPSIS
bool asort (array &$array, [int $sort_flags = SORT_REGULAR])
DESCRIPTION
This function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is
used mainly when sorting associative arrays where the actual element order is significant.
PARAMETERS
o $array
- The input array.
o $sort_flags
- You may modify the behavior of the sort using the optional parameter $sort_flags, for details see sort(3).
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
asort(3) example
<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
asort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val
";
}
?>
The above example will output:
c = apple
b = banana
d = lemon
a = orange
The fruits have been sorted in alphabetical order, and the index associated with each element has been maintained.
SEE ALSO
arsort(3), The comparison of array sorting functions.
PHP Documentation Group ASORT(3)