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January 28, 2011 21:51
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| /** | |
| * @param unsortedRecords The array that needs to be sorted. This array must be in the typical | |
| * format that our arrays are in after retrieving database data (i.e. array of records). | |
| * @param sortKeys The record keys that we'll be sorting on. | |
| * If this is an array, multi-column sorting will be done. | |
| * @param sortDirections The direction to sort the columns. | |
| * If this is an array, it should match up with the sort_keys array. | |
| * @param sortTypes The type of sorting that should be done (SORT_NUMERIC, SORT_STRING, etc. ) | |
| * If this is an array, it should match up with the sort_keys array. | |
| * @example To sort records by 'last_name' in descending order: | |
| * $sortedArray = multisortRecords( $records, 'last_name', SORT_DESC ) | |
| * @example To sort records by 'last_name' ascending, then 'first_name' descending: | |
| * $sortedArray = multisortRecords( $records, array( 'last_name', 'first_name' ), array( SORT_ASC, SORT_DESC ) ) | |
| * @author - Matthew Hayes <Matthew.Hayes@AllThingsCode.com | |
| */ | |
| function multisortRecords( &$unsortedRecords, $sortKeys, $sortDirections = SORT_ASC, $sortTypes = null ) | |
| { | |
| if( ( ! is_array( $unsortedRecords ) ) || ( ! count( $unsortedRecords ) ) ) { | |
| return array(); | |
| } | |
| // Convert params to arrays if they are not already. | |
| if( ! is_array( $sortKeys ) ) { | |
| $_sort_keys = array( $sortKeys ); | |
| } | |
| if( ! is_array( $sortDirections ) ) { | |
| $sortDirections = array_fill( 0, count( $sortKeys ), $sortDirections ); | |
| } | |
| if( ! is_array( $sortTypes ) ) { | |
| $sortTypes = array_fill( 0, count( $sortKeys ), $sortTypes ); | |
| } | |
| // Convert the sort directions in case they are plain text | |
| foreach( array_keys( $sortDirections ) as $key ) { | |
| switch( $sortDirections[ $key ] ) { | |
| case SORT_ASC: | |
| case SORT_DESC: | |
| break; | |
| case 'DESC': | |
| case 'SORT_DESC': | |
| $sortDirections[ $key ] = SORT_DESC; | |
| break; | |
| case 'ASC': | |
| case 'SORT_ASC': | |
| default: | |
| $sortDirections[ $key ] = SORT_ASC; | |
| } | |
| } | |
| // Convert the sort types in case they are plain text | |
| foreach( array_keys( $sortTypes ) as $key ) { | |
| switch( $sortTypes[ $key ] ) { | |
| case SORT_NUMERIC: | |
| case SORT_STRING: | |
| break; | |
| case 'NUMERIC': | |
| case 'SORT_NUMERIC': | |
| $sortTypes[ $key ] = SORT_NUMERIC; | |
| break; | |
| case 'STRING': | |
| case 'SORT_STRING': | |
| $sortTypes[ $key ] = SORT_STRING; | |
| break; | |
| default: | |
| $sortTypes[ $key ] = null; | |
| } | |
| } | |
| // Convert the data we'll be sorting on to column format | |
| $sortColumns = array(); | |
| foreach( $unsortedRecords as $key => $record ) { | |
| $sortColumns['primary_key'][ $key ] = $key; | |
| foreach( $sortKeys as $sortKeyIndex => $sortKeyName ) { | |
| $sortColumns[ $sortKeyName ][ $key ] = $record[ $sortKeyName ]; | |
| } | |
| } | |
| // Generate parameters for array_multisort() | |
| $arrayMultisortParams = array(); | |
| for( $i = 0; $i < count( $sortKeys ); $i++ ) { | |
| $arrayMultisortParams[] = $sortColumns[ $sortKeys[ $i ] ]; | |
| $arrayMultisortParams[] = $sortDirections[ $i ]; | |
| if( ! is_null( $sortTypes[ $i ] ) ) { | |
| $arrayMultisortParams[] = $sortTypes[ $i ]; | |
| } | |
| } | |
| // We HAVE to pass in the primary_key column so that we can put it all back together later. | |
| $arrayMultisortParams[] = $sortColumns['primary_key']; | |
| // This is where the actual sort is done. See Also: http://us.php.net/manual/en/function.array-multisort.php | |
| call_user_func_array( 'array_multisort', $arrayMultisortParams ); | |
| // Convert back to record format. | |
| // We just build a new sorted array | |
| // using the primary_key column (which is in the correct order now). | |
| $sortedRows = array(); | |
| foreach( $sortColumns['primary_key'] as $key ) { | |
| $sortedRows[ $key ] = $unsortedRecords[ $key ]; | |
| } | |
| return $sortedRows; | |
| } |
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