I don't know how efficient this is, but it might work well enough if your files are small:
There used to be a bug in asort, so go with caution. Also, asort is a gnu extension (I believe) so it might not be available. You could write a small sort function in the awk programme; again I don't know how efficient that is. I use a small bubble sort function, to avoid asort, but only in conjunction with small tasks because of a concern for efficiency.
EDIT: I ran a quick test to sort 25 values per line, over 100,000 lines. It took 10.6s on my not so speedy laptop.
Last edited by agama; 07-02-2012 at 11:37 PM..
Reason: Additional info.
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Discussion started by: mokachoka
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LEARN ABOUT PHP
asort
ASORT(3) 1 ASORT(3)asort - Sort an array and maintain index associationSYNOPSIS
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)