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Scripts > PHP > Navigatie systemen > sql_navigation()

sql_navigation()

Auteur: CelestialCelebi - 01 september 2004 - 19:19 - Gekeurd door: Dennisvb - Hits: 4745 - Aantal punten: 2.92 (6 stemmen)




Uhm, check uitleg? ^_^

Code:
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  1. <?php
  2. /*
  3. ***************************************************************************
  4. * Function sql_navigation(), used to create a link-index of page numbers  *
  5. * for paging through the records which come from your MySQL-database.     *
  6. * Copyright (C) 2004 The Celestial Celebi.                                *
  7. * This program is free software; you can redistribute it and/or modify it *
  8. * under the terms of the GNU General Public License as published by the   *
  9. * Free Software Foundation; either version 2 of the License, or (at your  *
  10. * option) any later version.                                              *
  11. * This program is distributed in the hope that it will be useful, but     *
  12. * WITHOUT ANY WARRANTY; without even the implied warranty of              *
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
  14. * General Public License for more details.                                *
  15. * You should have received a copy of the GNU General Public License along *
  16. * with this program; if not, write to the Free Software Foundation, Inc., *
  17. * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.               *
  18. ***************************************************************************
  19. */
  20.  
  21. /*
  22. ***************************************************************************
  23. * @function: sql_navigation(): Returns an array for creating a            *
  24. * pagination.                                                             *
  25. * @param $rDatabaseconnection (resource): Your database connection, we    *
  26. *  need it to get the total number of records from the database.  This    *
  27. *  parameter must be given by reference.                                  *
  28. * @param $aTable (string / array): The table where we need to take out    *
  29. *  the records for the navigation, can be an array of two elements: 1st   *
  30. *  is the table and the 2nd is a piece of query after the FROM.           *
  31. * @param $sUrl (string): The name of the file in your URL, plus (if there *
  32. *  is any) the query string, needed for making correct navigation links.  *
  33. * @param $sAlias (string): The alias you want to give the navigation you  *
  34. *  are making now, it becomes part of the URL: index.php?MYALIAS=40.      *
  35. * @param $iPerpage (int): The number of records you want to display per   *
  36. *  page.                                                                  *
  37. * @param $iType (int): The type of navigation, you can use either the     *
  38. *  constants or integer numbers, see constants for more information.      *
  39. * @return array: All information you need to display your navigation.     *
  40. *-------------------------------------------------------------------------*
  41. * @started on: 12 May 2004 at 20:25:56 by The Celestial Celebi.           *
  42. * @last edited on: 20 June 2004 at 11:36:38 by The Celestial Celebi.      *
  43. * @constructs used: array, else, elseif, if, for, return.                 *
  44. * @functions used: ceil, intval, is_array, isset, mysql_error,            *
  45. * mysql_query, mysql_result, trigger_error, str_replace, strstr, trim.    *
  46. ***************************************************************************
  47. */
  48.  
  49. function sql_navigation(&$rDatabaseconnection, $aTable, $sUrl, $sAlias, $iPerpage, $iType)
  50. {
  51. 	if(is_array($aTable))
  52. 	{
  53. 		$sQuerybit = ' ' . $aTable[1];
  54. 		$sTable = $aTable[0];
  55. 	}
  56. 	else
  57. 	{
  58. 		$sTable = $aTable;
  59. 		$sQuerybit = '';
  60. 	}
  61. 	$sSqlgetnumberofrecordsstring = "SELECT COUNT(1) AS totalrecords FROM " . $sTable . $sQuerybit;
  62. 	if(!$rSqlgetnumberofrecordsquery = mysql_query($sSqlgetnumberofrecordsstring, $rDatabaseconnection))
  63. 	{
  64. 		trigger_error('sql_navigation(): Could not query the total number of records from database, ' . mysql_error(), E_USER_WARNING);
  65. 		return;
  66. 	}
  67. 	else
  68. 	{
  69. 		$iTotalrecords = mysql_result($rSqlgetnumberofrecordsquery, 0, 'totalrecords');
  70. 		$iTotalpages = ($iTotalrecords / $iPerpage);
  71. 		$iTotalpages = ceil($iTotalpages);
  72. 		if(!isset($_GET[$sAlias]) || $_GET[$sAlias] > $iTotalpages || $_GET[$sAlias] < 1 || intval($_GET[$sAlias]) != $_GET[$sAlias]) // a whole block.. it's here to validate the pagenumber as some users might f*ck it up
  73. 		{
  74. 			$iCurrent = 1;
  75. 		}
  76. 		else
  77. 		{
  78. 			$iCurrent = intval($_GET[$sAlias]);
  79. 		}
  80. 		$iStartpoint = (($iCurrent - 1) * $iPerpage);
  81. 		if($iCurrent == $iTotalpages && ($iTotalrecords % $iPerpage) != 0)
  82. 		{
  83. 			$iEndpoint = ($iTotalrecords % $iPerpage);
  84. 			if($iEndpoint == 0)
  85. 			{
  86. 				$iEndpoint += 1;
  87. 			}
  88. 		}
  89. 		elseif($iTotalrecords == 0)
  90. 		{
  91. 			$iEndpoint = 0;
  92. 		}
  93. 		else
  94. 		{
  95. 			$iEndpoint = $iPerpage;
  96. 		}
  97. 		$sNavigation = '';
  98. 		if($iTotalpages != 1 && $iTotalrecords != 0)
  99. 		{
  100. 			if(strstr($sUrl, '?'))
  101. 			{
  102. 				$sUrlseperator = '&';
  103. 			}
  104. 			else
  105. 			{
  106. 				$sUrlseperator = '?';
  107. 			}
  108. 			if($iType == NAV_BOTH || $iType == NAV_PAGENUMBERS)
  109. 			{
  110. 				for($i = 1; $i <= $iTotalpages; $i++)
  111. 				{
  112. 					if($iCurrent == $i)
  113. 					{
  114. 						$sNavigation .= ' <b>' . $i . '</b> ';
  115. 					}
  116. 					else
  117. 					{
  118. 						$sNavigation .= ' <a class="navigation" href="' . $sUrl . $sUrlseperator . $sAlias . '=' . $i . '">' . $i . '</a> ';
  119. 					}
  120. 				}
  121. 			}
  122. 			if($iType == NAV_BOTH || $iType == NAV_PREVIOUSNEXT)
  123. 			{
  124. 				if($iCurrent != 1)
  125. 				{
  126. 					$sNavigation = '<a class="navigation" href="' . $sUrl . $sUrlseperator . $sAlias . '=' . ($iCurrent - 1) . '">vorige</a> ' . $sNavigation;
  127. 				}
  128. 				else
  129. 				{
  130. 					$sNavigation = 'vorige ' . $sNavigation;
  131. 				}
  132. 				if($iCurrent < $iTotalpages)
  133. 				{
  134. 					$sNavigation .= ' <a class="navigation" href="' . $sUrl . $sUrlseperator . $sAlias . '=' . ($iCurrent + 1) . '">volgende</a>';
  135. 				}
  136. 				else
  137. 				{
  138. 					$sNavigation .= ' volgende';
  139. 				}
  140. 			}
  141. 			$sNavigation = str_replace('  ', ' ', $sNavigation);
  142. 			$sNavigation = trim($sNavigation);
  143. 		}
  144. 		return array(
  145. 			'current' => $iCurrent,
  146. 			'navigation' => $sNavigation,
  147. 			'startpoint' => $iStartpoint,
  148. 			'endpoint' => $iEndpoint,
  149. 			'totalrecords' => $iTotalrecords,
  150. 			'totalpages' => $iTotalpages
  151. 		);
  152. 	}
  153. }
  154. ?>
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