php - Struggling to sort a muldimensional associative array -

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i have spent long time looking through forums, cannot work.

i have multidimensional, assoctaive array (in class). declared as:

protected $issnlookup = array();

in function, (to populate array data source):

foreach($this->keys $k) {     $issn = $this->getissn($k);     if($issn != '') { // publication has issn        if(array_key_exists($issn, $this->issnlookup)) {            $this->issnlookup[$issn]['number']++;        }        else {            $additem = array( 'journal' => $this->getjournal($k), 'number' => 1);            $this->issnlookup[$issn] = $additem;        } // else, key not on $issnlookup     } // if $issn != '' } // foreach

if display array contents, using:

foreach($this->issnlookup $key => $value) {   echo $key . ' (' . $value['journal'] . '): ' . $value['number'] . '</br>'; }

... looks good. (this sample):

0924-669x (applied intelligence): 3  1943-068x (ieee transactions on computational intelligence , ai in games): 6  1000-9000 (journal of computer science , technology): 1  0377-2217 (european journal of operational research): 8  0020-7721 (international journal of systems science): 1  1619-4500 (4or - quarterly journal of operations research): 2  0160-5682 (journal of operational research society): 11

if sort, using

usort($this->issnlookup, array($this, 'issnlookupjournalnamesort'));

with function (to compare values):

function issnlookupjournalnamesort($a, $b) {     return strcmp($a['journal'], $b['journal']); }

and display again (using same code above), get:

0 (4or - quarterly journal of operations research): 2  1 (advances in econometrics): 1  2 (annals of operations research): 3  3 (applied intelligence): 3  4 (applied soft computing): 3  5 (artificial life): 1

the sort has worked (i.e. names sorted - has happened 9-char id? seems have reverted counter

any appreciated.

the answer simple, use uasort:

uasort — sort array user-defined comparison function , maintain index association

uasort($this->issnlookup, array($this, 'issnlookupjournalnamesort'));

additional info on sorting methods http://php.net/manual/en/array.sorting.php.





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