Sort array by one field in array |
PHP: sort array by one field in array
There's probably a PHP function that does this, but I haven't been able to find it, so I rolled my own. First procedurally:
# ingredients
# $ARRAY : array or arrays to be sorted
# $sortby_index : index/column to be sorted on
# $key_index : equivalent to primary key column in SQL array
# get ordering array
foreach ( $ARRAY as $_DATA )
{
$_key = $_DATA[$key_index];
$ORDERING[$_key] = $_DATA[$sortby_index];
}
# sort ordering array
asort($ORDERING);
# DEBUG
#trigger_notice($ORDERING);
# map ARRAY back to ordering array
foreach ( $ORDERING as $_key => $_sort_col_val )
{
# get index for ARRAY where ARRAY[][$key_index] == $_key
foreach ($ARRAY as $_i => $_DATA)
{
if ( $_key == $_DATA[$key_index] )
{
$SORTED[] = $ARRAY[$_i];
continue;
}
}
}
Now as a function
function sort_array_of_arrays($ARRAY, $sortby_index, $key_index)
{
// *** NOTES
/*
requires array of associative arrays -- not checked within array
*/
// *** DATA
# order array
$ORDERING = array();
# return
$SORTED = array();
# internal
$_DATA = array();
$_key = '';
$_sort_col_val = '';
$_i = 0;
// *** MANIPULATE
# get ordering array
foreach ( $ARRAY as $_DATA )
{
$_key = $_DATA[$key_index];
$ORDERING[$_key] = $_DATA[$sortby_index];
}
# sort ordering array
asort($ORDERING);
# DEBUG
#trigger_notice($ORDERING);
# map ARRAY back to ordering array
foreach ( $ORDERING as $_key => $_sort_col_val )
{
# get index for ARRAY where ARRAY[][$key_index] == $_key
foreach ($ARRAY as $_i => $_DATA)
{
if ( $_key == $_DATA[$key_index] )
{
$SORTED[] = $ARRAY[$_i];
continue;
}
}
}
// *** RETURN
return $SORTED;
} # end Fx
Assumes asort will sort matters for you. Function will not work if you have to do some calculations on the sort index before sorting. But easily adapted.
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