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- <?php
- /*
- ==============================================================================
- Dokeos - elearning and course management software
-
- Copyright (c) 2004 Dokeos S.A.
- Copyright (c) 2003 Ghent University (UGent)
- Copyright (c) 2001 Universite catholique de Louvain (UCL)
- Copyright (c) Bart Mollet (bart.mollet@hogent.be)
-
- For a full list of contributors, see "credits.txt".
- The full license can be read in "license.txt".
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
-
- See the GNU General Public License for more details.
-
- Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
- Mail: info@dokeos.com
- ==============================================================================
- */
- /**
- ==============================================================================
- * This is a library with some functions to sort tabular data
- *
- * @package dokeos.library
- ==============================================================================
- */
- define('SORT_DATE', 3);
- define('SORT_IMAGE',4);
- class TableSort
- {
- /**
- * String to lowercase (keep accents).
- * @param string $txt The string to convert
- * @author René Haentjens
- * This function is 8859-1 specific and should be adapted when Dokeos is
- * used with other charsets.
- */
- function strtolower_keepaccents($txt)
- {
- return strtolower(strtr($txt, "ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ", "àáâãäåæçèéêëìíîïðñòóôõöøùúûüýþ"));
- }
- /**
- * String to lowercase.
- * @param string $txt The string to convert
- * @author René Haentjens
- * This function is 8859-1 specific and should be adapted when Dokeos is
- * used with other charsets.
- */
- function strtolower_eorlatin($txt)
- {
- return str_replace(array ("æ", "ß"), array ("ae", "ss"), strtr(TableSort::strtolower_keepaccents($txt), "àáâãäåçèéêëìíîïðñòóôõöøùúûüýÿ", "aaaaaaceeeeiiiidnoooooouuuuyy"));
- // do not replace "þ" by "th", leave it at the end of the alphabet...
- // do not replace any of "$&¢£¥©ª®µº", though they resemble letters...
- }
- /**
- * Create a string to use in sorting.
- * @param string $txt The string to convert
- * @author René Haentjens
- * This function is 8859-1 specific and should be adapted when Dokeos is
- * used with other charsets.
- * See http://anubis.dkuug.dk/CEN/TC304/EOR/eorhome.html
- * Function 'orderingstring' can be used to implement EOR level 1 ordering,
- * for 8859- 1.
- */
- function orderingstring($txt)
- {
- return ereg_replace("[^0-9a-zþ]", "", TableSort::strtolower_eorlatin($txt));
- }
- /**
- * Sort 2-dimensional table.
- * @param array $data The data to be sorted.
- * @param int $column The column on which the data should be sorted (default =
- * 0)
- * @param string $direction The direction to sort (SORT_ASC (default) or
- * SORT_DESC)
- * @param constant $type How should data be sorted (SORT_REGULAR, SORT_NUMERIC,
- * SORT_STRING,SORT_DATE,SORT_IMAGE)
- * @return array The sorted dataset
- * @author bart.mollet@hogent.be
- */
- function sort_table($data, $column = 0, $direction = SORT_ASC, $type = SORT_REGULAR)
- {
- switch ($type)
- {
- case SORT_REGULAR :
- if (TableSort::is_image_column($data, $column))
- {
- return TableSort::sort_table($data, $column, $direction, SORT_IMAGE);
- }
- elseif (TableSort::is_date_column($data, $column))
- {
- return TableSort::sort_table($data, $column, $direction, SORT_DATE);
- }
- elseif (TableSort::is_numeric_column($data, $column))
- {
- return TableSort::sort_table($data, $column, $direction, SORT_NUMERIC);
- }
- return TableSort::sort_table($data, $column, $direction, SORT_STRING);
- break;
- case SORT_NUMERIC :
- $compare_function = 'strip_tags($el1) > strip_tags($el2)';
- break;
- case SORT_STRING :
- $compare_function = 'strnatcmp(TableSort::orderingstring(strip_tags($el1)),TableSort::orderingstring(strip_tags($el2))) > 0';
- break;
- case SORT_IMAGE :
- $compare_function = 'strnatcmp(TableSort::orderingstring(strip_tags($el1,"<img>")),TableSort::orderingstring(strip_tags($el2,"<img>"))) > 0';
- break;
- case SORT_DATE :
- $compare_function = 'strtotime(strip_tags($el1)) > strtotime(strip_tags($el2))';
- }
- $function_body = '$el1 = $a['.$column.']; $el2 = $b['.$column.']; return ('.$direction.' == SORT_ASC ? ('.$compare_function.') : !('.$compare_function.'));';
- // Sort the content
- usort($data, create_function('$a,$b', $function_body));
- return $data;
- }
- /**
- * Checks if a column of a 2D-array contains only numeric values
- * @param array $data The data-array
- * @param int $column The index of the column to check
- * @return bool true if column contains only dates, false otherwise
- * @todo Take locale into account (eg decimal point or comma ?)
- * @author bart.mollet@hogent.be
- */
- function is_numeric_column($data, $column)
- {
- $is_numeric = true;
- foreach ($data as $index => $row)
- {
- $is_numeric &= is_numeric(strip_tags($row[$column]));
- }
- return $is_numeric;
- }
- /**
- * Checks if a column of a 2D-array contains only dates (GNU date syntax)
- * @param array $data The data-array
- * @param int $column The index of the column to check
- * @return bool true if column contains only dates, false otherwise
- * @author bart.mollet@hogent.be
- */
- function is_date_column($data, $column)
- {
- $is_date = true;
- foreach ($data as $index => $row)
- {
- if(strlen(strip_tags($row[$column])) != 0 )
- {
- $check_date = strtotime(strip_tags($row[$column]));
- // strtotime Returns a timestamp on success, FALSE otherwise.
- // Previous to PHP 5.1.0, this function would return -1 on failure.
- $is_date &= ($check_date != -1 && $check_date != false);
- }
- else
- {
- $is_date &= false;
- }
- }
- return $is_date;
- }
- /**
- * Checks if a column of a 2D-array contains only images (<img src="
- * path/file.ext" alt=".."/>)
- * @param array $data The data-array
- * @param int $column The index of the column to check
- * @return bool true if column contains only images, false otherwise
- * @author bart.mollet@hogent.be
- */
- function is_image_column($data, $column)
- {
- $is_image = true;
- foreach ($data as $index => $row)
- {
- $is_image &= strlen(trim(strip_tags($row[$column],'<img>'))) > 0; // at least one img-tag
- $is_image &= strlen(trim(strip_tags($row[$column]))) == 0; // and no text outside attribute-values
- }
- return $is_image;
- }
- }
- ?>
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