89 lines
2.5 KiB
PHP
89 lines
2.5 KiB
PHP
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<?
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/* EXAMPLE:
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$sample_arr = array (
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array (
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"UserName" => "Usr1",
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"Sex" => "male",
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"Country" => "US",
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"Children" => 3,
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"BirthDate" => "1970-07-21"
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),
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array (
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"UserName" => "TheUser",
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"Sex" => "female",
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"Country" => "Canada",
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"Children" => 0,
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"BirthDate" => "1975-11-05"
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)
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);
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$srt = new arr_multisort($sample_arr);
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$srt->sort();
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dump_arr($sample_arr);
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//Sort by sex descending and children ascending
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$srt->colNames = array("Sex", "Children");
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$srt->colDirs = array(SRT_DESC,SRT_ASC);
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$sample_arr = $srt->sort();
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//Sort by sex ascending and Birth date decending
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$srt->colNames = array("Sex", "BirthDate");
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$srt->colDirs = array(SRT_ASC,SRT_DESC);
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$sample_arr = $srt->sort();
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*/
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define("SRT_ASC",1);
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define("SRT_DESC",-1);
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Class arr_multisort{
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//The array to be sorted
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var $arr = NULL;
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//Single dimensioned array with column names. Ex. array("UserName","Sex","Country")
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var $colNames = NULL;
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/*
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Single dimensioned array with sort directions. Ex. array(SRT_ASC,SRT_ASC,SRT_DESC)
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Must have the same length as $colNames array
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*/
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var $colDirs = NULL;
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//Constructor
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function arr_multisort(&$arr,$colNames=array(),$colDirs=array()){
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$this->arr = $arr;
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$this->colNames = $colNames;
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$this->colDirs = $colDirs;
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}
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//sort() method
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function &sort(){
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usort($this->arr,array($this,"_compare"));
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return $this->arr;
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}
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//Comparison function [PRIVATE]
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function _compare($a,$b,$idx = 0){
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if(count($this->colNames) == 0 || count($this->colNames) != count($this->colDirs)) return 0;
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$a_cmp = $a[$this->colNames[$idx]];
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$b_cmp = $b[$this->colNames[$idx]];
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$a_dt = strtotime($a_cmp);
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$b_dt = strtotime($b_cmp);
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if(($a_dt == -1) || ($b_dt == -1))
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$ret = $this->colDirs[$idx]*strnatcasecmp($a_cmp,$b_cmp);
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else{
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$ret = $this->colDirs[$idx]*(($a_dt > $b_dt)?1:(($a_dt < $b_dt)?-1:0));
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}
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if($ret == 0){
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if($idx < (count($this->colNames)-1))
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return $this->_compare($a,$b,$idx+1);
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else
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return $ret;
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}
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else
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return $ret;
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}
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}
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?>
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