目标是对我的搜索结果进行分页，但由于某些原因，当我搜索并且结果不止一个页面时，我点击第二页并且没有任何内容出现。我认为原因是因为POST，但我真的不确定。我哪里错了？
<?php
include "functions.php";
error_reporting(E_ALL);
ini_set('display_errors', '1');
$search_output = "";
$nr = "";
if(isset($_POST['searchquery']) && $_POST['searchquery'] != ""){
$searchquery = preg_replace('#[^a-zA-Z 0-9?!]#i', '', $_POST['searchquery']);
$sqlCommand2 = "
(SELECT id AS id, username AS name, firstname AS admin
FROM myMembers
WHERE firstname LIKE '%$searchquery%' OR lastname LIKE '%$searchquery%' OR username LIKE '%$searchquery%')
UNION (SELECT id AS id, team_name AS name, churchname AS admin
FROM myTeams
WHERE team_name LIKE '%$searchquery%' OR churchname LIKE '%$searchquery%' OR admin_name LIKE '%$searchquery%') ORDER BY id";
$query = mysql_query($sqlCommand2) or die(mysql_error());
$nr = mysql_num_rows($query);
if($nr > 0){
$nr = mysql_num_rows($query); // Get total of Num rows from the database query
if (isset($_GET['pn'])) { // Get pn from URL vars if it is present
$pn = preg_replace('#[^0-9]#i', '', $_GET['pn']); // filter everything but numbers for security(new)
} else { // If the pn URL variable is not present force it to be value of page number 1
$pn = 1;
}
//This is where we set how many database items to show on each page
$itemsPerPage = 10;
// Get the value of the last page in the pagination result set
$lastPage = ceil($nr / $itemsPerPage);
// Be sure URL variable $pn(page number) is no lower than page 1 and no higher than $lastpage
if ($pn < 1) { // If it is less than 1
$pn = 1; // force if to be 1
} else if ($pn > $lastPage) { // if it is greater than $lastpage
$pn = $lastPage; // force it to be $lastpage's value
}
// This creates the numbers to click in between the next and back buttons
$centerPages = ""; // Initialize this variable
$sub1 = $pn - 1;
$sub2 = $pn - 2;
$add1 = $pn + 1;
$add2 = $pn + 2;
if ($pn == 1) {
$centerPages .= ' <span class="pagNumActive">' . $pn . '</span> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '" style="color:black">' . $add1 . '</a> ';
} else if ($pn == $lastPage) {
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '" style="color:black">' . $sub1 . '</a> ';
$centerPages .= ' <span class="pagNumActive">' . $pn . '</span> ';
} else if ($pn > 2 && $pn < ($lastPage - 1)) {
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub2 . '" style="color:black">' . $sub2 . '</a> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '" style="color:black">' . $sub1 . '</a> ';
$centerPages .= ' <span class="pagNumActive">' . $pn . '</span> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '" style="color:black">' . $add1 . '</a> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add2 . '" style="color:black">' . $add2 . '</a> ';
} else if ($pn > 1 && $pn < $lastPage) {
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '" style="color:black">' . $sub1 . '</a> ';
$centerPages .= ' <span class="pagNumActive">' . $pn . '</span> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '" style="color:black">' . $add1 . '</a> ';
}
// This line sets the "LIMIT" range... the 2 values we place to choose a range of rows from database in our query
$limit = 'LIMIT ' .($pn - 1) * $itemsPerPage .',' .$itemsPerPage;
// Now we are going to run the same query as above but this time add $limit onto the end of the SQL syntax
// $sql2 is what we will use to fuel our while loop statement below
$sql2 = mysql_query("
(SELECT id AS id, username AS name, firstname AS admin
FROM myMembers
WHERE firstname LIKE '%$searchquery%' OR lastname LIKE '%$searchquery%' OR username LIKE '%$searchquery%')
UNION (SELECT id AS id, team_name AS name, churchname AS admin
FROM myTeams
WHERE team_name LIKE '%$searchquery%' OR churchname LIKE '%$searchquery%' OR admin_name LIKE '%$searchquery%') ORDER BY id $limit");
$paginationDisplay = ""; // Initialize the pagination output variable
// This code runs only if the last page variable is not equal to 1, if it is only 1 page we require no paginated links to display
if ($lastPage != "1"){
// This shows the user what page they are on, and the total number of pages
$paginationDisplay .= 'Page <strong>' . $pn . '</strong> of ' . $lastPage. '<img src="images/clearImage.gif" width="48" height="1" alt="Spacer" />';
// If we are not on page 1 we can place the Back button
if ($pn != 1) {
$previous = $pn - 1;
$paginationDisplay .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $previous . '" style="color:black"> Back</a> ';
}
// Lay in the clickable numbers display here between the Back and Next links
$paginationDisplay .= '<span class="paginationNumbers">' . $centerPages . '</span>';
// If we are not on the very last page we can place the Next button
if ($pn != $lastPage) {
$nextPage = $pn + 1;
$paginationDisplay .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $nextPage . '" style="color:black"> Next</a> ';
}
}
////////////Display output/////////////////////////////////////////////////////////
while($row = mysql_fetch_array($sql2)){
$id = $row["id"];
$name = $row['name'];
$real = $row['admin'];
$sql_if1 = mysql_query("SELECT id, username, firstname FROM myMembers");
while($row2 = mysql_fetch_array($sql_if1)){
$if1id = $row2['id'];
$if1user = $row2['username'];
$if1first = $row2['firstname'];
$userpic1 = '<div style="width:50px; height:50px; overflow:hidden; float:left; margin-right:20px;">' . check_pic("members", $if1id, "50", "profile") . '</div>';
if($id == $if1id && $name == $if1user){
$search_output .= '<div style="height:60px; padding:7px 5px 0px 5px;">' . $userpic1 . 'Username - <a href="profile.php?id='.$if1id.'" style="color:black;">' . $if1user . '<br />First Name - '.$if1first.'</a></div><hr />';
}
}
$sql_if2 = mysql_query("SELECT id, team_name, admin_name, churchname FROM myTeams");
while($row3 = mysql_fetch_array($sql_if2)){
$if2id = $row3['id'];
$if2user = $row3['team_name'];
$if2first = $row3['admin_name'];
$if2church = $row3['churchname'];
$userpic2 = '<div style="width:50px; height:50px; overflow:hidden; float:left; margin-right:20px;">' . check_pic("teams", $if2id, "50", "team") . '</div>';
if($id == $if2id && $name == $if2user){
$search_output .= '<div style="height:60px; padding:7px 5px 0px 5px;">' . $userpic2 . '<a href="team.php?id='.$if2id.'" style="color:black;">Team Name - ' . $if2user . '<br />Team Admin - '.$if2first.'</a></div><hr />';
}
}
} // close while
} else {
$search_output = "<hr />0 results for <strong>$searchquery</strong><hr />$sqlCommand2";
}
}
?>
答案 0 :(得分：2)
if(isset($_POST['searchquery']) && $_POST['searchquery'] != "")可以替换为if(!empty($_POST['searchquery']))
你不需要$nr = mysql_num_rows($query); 里面的'if（$ nr＆gt; 0）';
你知道$ sql_if1和$ sql_if2没有where子句吗？ protip，这很好，如果超出主要的获取循环，使用内部方法重新调整行，但这是另一个故事......
现在，在更概念的层面上，你可能最好只查询一次db。一个简单的选择是将结果存储在$ _SESSION中。
if (empty($_GET['pn'])) {
... //db query stuff
$query = mysql_query($sqlCommand2) or die(mysql_error());
$results = $query->to_array; // to sure if it exists, use pdo anyway ^^
$_SESSION['usersChurchResults'] = $results;
}
else {
$results = $_SESSION['usersChurchResults']
}
$nr = count($results);
...
然后很容易对数组进行分页。
最后，是的，这是由于$ _POST。当您单击“第2页”时，您将获得$ _GET参数（页码），但没有$ _POST，因为表单未提交。所以基本上，你必须在执行sql2之前结束if（！empty（$ _ POST））块，并在它之外声明if (isset($_GET['pn']))块，以便能够在你的“限制”结构中访问$ pn功能
想要完整的代码，还是这样呢？
编辑：我在那里，所以在这里：
<?php
include "functions.php";
error_reporting(E_ALL);
ini_set('display_errors', '1');
$search_output = "";
$nr = "";
if (isset($_GET['pn'])) { // Get pn from URL vars if it is present
$pn = preg_replace('#[^0-9]#i', '', $_GET['pn']); // filter everything but numbers for security(new)
} else { // If the pn URL variable is not present force it to be value of page number 1
$pn = 1;
}
if( ! empty($_POST['searchquery']) ) {
$searchquery = preg_replace('#[^a-zA-Z 0-9?!]#i', '', $_POST['searchquery']);
// TODO: use pdo, plizzz
$_SESSION['membersTeamsSearchquery'] = $searchquery;
$sqlCommand2 = "
(SELECT id AS id, username AS name, firstname AS admin
FROM myMembers
WHERE firstname LIKE '%$searchquery%' OR lastname LIKE '%$searchquery%' OR username LIKE '%$searchquery%')
UNION (SELECT id AS id, team_name AS name, churchname AS admin
FROM myTeams
WHERE team_name LIKE '%$searchquery%' OR churchname LIKE '%$searchquery%' OR admin_name LIKE '%$searchquery%') ORDER BY id";
$query = mysql_query($sqlCommand2) or die(mysql_error());
$nr = mysql_num_rows($query);
if($nr > 0){
$nr = mysql_num_rows($query); // Get total of Num rows from the database query
//This is where we set how many database items to show on each page
$itemsPerPage = 10;
// Get the value of the last page in the pagination result set
$lastPage = ceil($nr / $itemsPerPage);
// Be sure URL variable $pn(page number) is no lower than page 1 and no higher than $lastpage
if ($pn < 1) { // If it is less than 1
$pn = 1; // force if to be 1
} else if ($pn > $lastPage) { // if it is greater than $lastpage
$pn = $lastPage; // force it to be $lastpage's value
}
// This creates the numbers to click in between the next and back buttons
$centerPages = ""; // Initialize this variable
$sub1 = $pn - 1;
$sub2 = $pn - 2;
$add1 = $pn + 1;
$add2 = $pn + 2;
if ($pn == 1) {
$centerPages .= ' <span class="pagNumActive">' . $pn . '</span> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '" style="color:black">' . $add1 . '</a> ';
} else if ($pn == $lastPage) {
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '" style="color:black">' . $sub1 . '</a> ';
$centerPages .= ' <span class="pagNumActive">' . $pn . '</span> ';
} else if ($pn > 2 && $pn < ($lastPage - 1)) {
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub2 . '" style="color:black">' . $sub2 . '</a> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '" style="color:black">' . $sub1 . '</a> ';
$centerPages .= ' <span class="pagNumActive">' . $pn . '</span> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '" style="color:black">' . $add1 . '</a> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add2 . '" style="color:black">' . $add2 . '</a> ';
} else if ($pn > 1 && $pn < $lastPage) {
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '" style="color:black">' . $sub1 . '</a> ';
$centerPages .= ' <span class="pagNumActive">' . $pn . '</span> ';
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '" style="color:black">' . $add1 . '</a> ';
}
}
} // end POST
// TODO: output/echo pagination display and centerPages, maybe??????????????????????????????????????????????
if($nr > 0){ /* output pagination */ }
//// get output data //// and several more /
if($nr > 0 || empty($_POST['searchquery'])){ // "|| $np > 1" won't work if you click on page 2, and then page 1 again
// This line sets the "LIMIT" range... the 2 values we place to choose a range of rows from database in our query
$limit = 'LIMIT ' .($pn - 1) * $itemsPerPage .',' .$itemsPerPage;
// Now we are going to run the same query as above but this time add $limit onto the end of the SQL syntax
// $sql2 is what we will use to fuel our while loop statement below
$searchquery = $_SESSION['membersTeamsSearchquery'];
$sql2 = mysql_query("
(SELECT 'member' AS type, id AS id, username AS name, firstname AS admin
FROM myMembers
WHERE firstname LIKE '%$searchquery%' OR lastname LIKE '%$searchquery%' OR username LIKE '%$searchquery%')
UNION (SELECT 'team' AS type, id AS id, team_name AS name, churchname AS admin
FROM myTeams
WHERE team_name LIKE '%$searchquery%' OR churchname LIKE '%$searchquery%' OR admin_name LIKE '%$searchquery%') ORDER BY id $limit");
$paginationDisplay = ""; // Initialize the pagination output variable
// This code runs only if the last page variable is not equal to 1, if it is only 1 page we require no paginated links to display
if ($lastPage != "1"){
// This shows the user what page they are on, and the total number of pages
$paginationDisplay .= 'Page <strong>' . $pn . '</strong> of ' . $lastPage. '<img src="images/clearImage.gif" width="48" height="1" alt="Spacer" />';
// If we are not on page 1 we can place the Back button
if ($pn != 1) {
$previous = $pn - 1;
$paginationDisplay .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $previous . '" style="color:black"> Back</a> ';
}
// Lay in the clickable numbers display here between the Back and Next links
$paginationDisplay .= '<span class="paginationNumbers">' . $centerPages . '</span>';
// If we are not on the very last page we can place the Next button
if ($pn != $lastPage) {
$nextPage = $pn + 1;
$paginationDisplay .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $nextPage . '" style="color:black"> Next</a> ';
}
}
////////////Display output/////////////////////////////////////////////////////////
// TODO: don't use row2 rowX, or play saint row, use $row_myMembers...
// TODO: get the firstname, userpic, etc in in "sql2" query.
// TODO: will only work if IDs in members and teams are different, AFTER the addition of my where clause.
while($row = mysql_fetch_assoc($sql2)){
$id = $row["id"];
$name = $row['name'];
//$sql_if1 = mysql_query("SELECT id, username, firstname FROM myMembers");
$real = $row['admin'];
if ( $row['type'] == 'member' ) {
$sql_if1 = mysql_query("SELECT id, username, firstname FROM myMembers WHERE id=".$id); // if ID is an integer
while($row2 = mysql_fetch_array($sql_if1)){
$if1id = $row2['id'];
$if1user = $row2['username'];
$if1first = $row2['firstname'];
$userpic1 = '<div style="width:50px; height:50px; overflow:hidden; float:left; margin-right:20px;">' . check_pic("members", $if1id, "50", "profile") . '</div>';
if($id == $if1id && $name == $if1user){
$search_output .= '<div style="height:60px; padding:7px 5px 0px 5px;">' . $userpic1 . 'Username - <a href="profile.php?id='.$if1id.'" style="color:black;">' . $if1user . '<br />First Name - '.$if1first.'</a></div><hr />';
}
}
}
else // if team
{
$sql_if2 = mysql_query("SELECT id, team_name, admin_name, churchname FROM myTeams WHERE id='".$id."'"); // if ID is a string
while($row3 = mysql_fetch_array($sql_if2)){
$if2id = $row3['id'];
$if2user = $row3['team_name'];
$if2first = $row3['admin_name'];
$if2church = $row3['churchname'];
$userpic2 = '<div style="width:50px; height:50px; overflow:hidden; float:left; margin-right:20px;">' . check_pic("teams", $if2id, "50", "team") . '</div>';
if($id == $if2id && $name == $if2user){
$search_output .= '<div style="height:60px; padding:7px 5px 0px 5px;">' . $userpic2 . '<a href="team.php?id='.$if2id.'" style="color:black;">Team Name - ' . $if2user . '<br />Team Admin - '.$if2first.'</a></div><hr />';
}
}
}
} // close while
} else {
$search_output = "<hr />0 results for <strong>$searchquery</strong><hr />$sqlCommand2";
} // OPEN BEER \o/
?>
还有很多工作要做，但它会起作用。
答案 1 :(得分：1)
如果设置了'searchquery'，您的脚本似乎只生成输出。
您构建的链接仅回答'pn ='问题。
也许添加：
$centerPages .= ' <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '&searchquery=' . $_POST["searchquery"] .'" style="color:black">' . $add1 . '</a> '
到以下链接：
if($pn==1) {
部分。
这是一个非常长的剧本，可能会有更多的问题。