Search and Sort with MySQL Data in PHP - php

Question

I'm learning PHP, I create a page to show my data table in MySQL. I want to paging, searching, sorting with that data.
I write some conditions to search and sort. But it's not working. My Paging seem work fine.
<?php
echo "<form action = 'Activiti_Data_Table_Detail.php' method = 'post'>";
echo "<input type = 'text' name = 'valueToSearch' placeholder = 'Value to search'><br><br>";
echo "<input type = 'submit' name = 'search' value = 'Filter'><br><br>";
echo "<input type = 'submit' name = 'ASC' value = 'Ascending'><br><br>";
echo "<input type = 'submit' name = 'DESC' value = 'Descending'><br><br>";
echo "<table id = 'datatable' border='1'>";
echo "<thead>";
echo "<tr>";
echo "<th>ID_</th>";
echo "<th>PROC_INST_ID_</th>";
echo "<th>BUSINESS_KEY_</th>";
echo "<th>PROC_DEF_ID_</th>";
echo "<th>START_TIME_</th>";
echo "<th>END_TIME_</th>";
echo "<th>DURATION_</th>";
echo "<th>START_USER_ID_</th>";
echo "<th>START_ACT_ID_</th>";
echo "<th>END_ACT_ID_</th>";
echo "<th>SUPER_PROCESS_INSTANCE_ID_</th>";
echo "<th>DELETE_REASON_</th>";
echo "<th>TENANT_ID_</th>";
echo "<th>NAME_</th>";
echo "</tr>";
echo "</thead>";
//connect to database
$con=mysqli_connect("localhost","root","123456","activiti") or die(mysqli_connect_errno());
//define how many results per page
$result_per_page = 10;
//number of results stored in database
$sql = "SELECT * FROM act_hi_procinst";
$result = mysqli_query($con, $sql);
$num_of_results = mysqli_num_rows($result); //225
//determine number of total pages available
$number_of_pages = ceil($num_of_results/$result_per_page);
//determine current page is on
if (!isset($_GET['page'])) {
$page = 1;
} else {
$page = $_GET['page'];
}
//determine the SQL LIMIT starting number for the result on the displaying page
$this_page_first_result = ($page - 1) * $result_per_page;
if(isset($_POST['search']) & isset($_POST['ASC'])){
$valueToSearch = $_POST['valueToSearch'];
$sql = "SELECT * FROM act_hi_procinst WHERE concat(ID_, PROC_INST_ID_, PROC_DEF_ID_, START_TIME_, END_TIME_, DURATION_) LIKE '%".$valueToSearch."%'
ORDER BY END_TIME_ ASC LIMIT" .$this_page_first_result . ',' . $result_per_page;
} elseif (isset($_POST['search']) & isset($_POST['DESC'])) {
$valueToSearch = $_POST['valueToSearch'];
$sql = "SELECT * FROM act_hi_procinst WHERE concat(ID_, PROC_INST_ID_, PROC_DEF_ID_, START_TIME_, END_TIME_, DURATION_) LIKE '%".$valueToSearch."%'
ORDER BY END_TIME_ DESC LIMIT" .$this_page_first_result . ',' . $result_per_page;
} elseif (isset($_POST['search'])) {
$valueToSearch = $_POST['valueToSearch'];
$sql = "SELECT * FROM act_hi_procinst WHERE concat(ID_, PROC_INST_ID_, PROC_DEF_ID_, START_TIME_, END_TIME_, DURATION_) LIKE '%".$valueToSearch."%'
LIMIT" .$this_page_first_result . ',' . $result_per_page;
} elseif (isset($_POST['ASC'])) {
$sql = "SELECT * FROM act_hi_procinst ORDER BY END_TIME_ ASC LIMIT" .$this_page_first_result . ',' . $result_per_page;
} elseif (isset($_POST['DESC'])) {
$sql = "SELECT * FROM act_hi_procinst ORDER BY END_TIME_ DESC LIMIT" .$this_page_first_result . ',' . $result_per_page;
} else {
$sql = "SELECT * FROM act_hi_procinst LIMIT" .$this_page_first_result . ',' . $result_per_page;
}
$result = mysqli_query($con, $sql);
while ($row = mysqli_fetch_array($result)) {
echo "<tbody>";
echo "<tr>";
echo "<td><a href='Data_Table_Detail.php' target='_blank'>" . $row['ID_'] . "</a></td>";
echo "<td>" . $row['PROC_INST_ID_'] . "</td>";
echo "<td>" . $row['BUSINESS_KEY_'] . "</td>";
echo "<td>" . $row['PROC_DEF_ID_'] . "</td>";
echo "<td>" . $row['START_TIME_'] . "</td>";
echo "<td>" . $row['END_TIME_'] . "</td>";
echo "<td>" . $row['DURATION_'] . "</td>";
echo "<td>" . $row['START_USER_ID_'] . "</td>";
echo "<td>" . $row['START_ACT_ID_'] . "</td>";
echo "<td>" . $row['END_ACT_ID_'] . "</td>";
echo "<td>" . $row['SUPER_PROCESS_INSTANCE_ID_'] . "</td>";
echo "<td>" . $row['DELETE_REASON_'] . "</td>";
echo "<td>" . $row['TENANT_ID_'] . "</td>";
echo "<td>" . $row['NAME_'] . "</td>";
echo "</tr>";
}
echo "</tbody>";
echo "</table>";
echo "</form>";
//display the links to the page
for($page = 1; $page <= $number_of_pages; $page++) {
echo '' . $page . ' ';
}
mysqli_close($con);
?>
When I run this, it say: Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result.
Can you help me?
Thank you!

Answer 1

try change all your ifs for this:
$valueToSearch = isset($_POST['search']) ? $_POST['valueToSearch'] : '';
$orderBy = isset($_POST['ASC']) ? 'ORDER BY END_TIME_ ASC' : (isset($_POST['DESC']) ? 'ORDER BY END_TIME_ DESC' : '');
$sql = "SELECT * FROM act_hi_procinst WHERE concat(ID_, PROC_INST_ID_, PROC_DEF_ID_, START_TIME_, END_TIME_, DURATION_) LIKE '%".$valueToSearch."%' " . $orderBy . " LIMIT " . $this_page_first_result . ',' . $result_per_page;