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Posted By

collin on 11/01/06


Tagged

php array index map


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map_index

 / Published in: PHP
 

A way of compacting an array of arrays into an array of values.

Say you have an NxM matrix, where each child array represents a row, and you want to iterate over the first element in each row: foreach(mapindex(0, $matrix) as $firstelem) ...

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  1. function map_index($index, $array)
  2. {
  3.     $out = array();
  4.     foreach($array as $row)
  5.         $out[] = $row[$index];
  6.     return $out;
  7. }

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