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當我點擊搜索按鈕時沒有在文本框中輸入任何文本，它給了我「警告：mysqli_fetch_assoc（）期望參數1爲mysqli_result，字符串給出」this error ，我怎麼能弄清楚這個問題，這裏是我的代碼的任何幫助將不勝感激警告：mysqli_fetch_assoc（）期望參數1是mysqli_result，給出的字符串
<?php
$title ="Manage Page";
include "includes/home_page_header.php";
?>
<?php
$error_array = array();
$count =1;
$firstName = $lastName = $email = $status =$res_users = $checkbox ="";
if(isset($_POST['Search']))
{
$firstName = $_POST['firstName'];
$lastName = $_POST['lastName'];
$email = $_POST['email'];
$status = $_POST['status'];
if($firstName !="")
{
$sql_users ="SELECT * FROM `users` WHERE `firstName` LIKE '$firstName'";
}
else if($lastName !="")
{
$sql_users ="SELECT * FROM `users` WHERE `lastName` LIKE '$lastName'";
}
else if($email !="")
{
$sql_users ="SELECT * FROM `users` WHERE `email` LIKE '$email'";
}
else if($firstName !="" && $lastName !="")
{
$sql_users ="SELECT * FROM `users` WHERE `firstName` LIKE '$firstName' AND `lastName` LIKE '$lastName'";
}
else
{
$sql_users = "SELECT * FROM `users`";
}
if(isset($_GET['user_id']))
{
$user_id = $_GET['user_id'];
$sql_users = "DELETE from `users` WHERE user_id=".$user_id;
if ($link->query($sql_users) == TRUE)
{
$error ="Record deleted successfully";
array_push($error_array,$error);
}
if ($link->query($sql_users) == FALSE)
{
$error = "Your Abort Delete operation";
array_push($error_array,$error);
}
}
if($status == "Active")
{
$sql_users= "SELECT * FROM `users` WHERE `status` LIKE 'Active'";
$res_users = mysqli_query($link,$sql_users);
if($res_users && mysqli_num_rows($res_users) > 0)
{
while($log_row_users = mysqli_fetch_assoc($res_users))
{
$status = $log_row_users["status"];
}
}
}
if($status == "Inactive")
{
$sql_users= "SELECT * FROM `users` WHERE `status` LIKE 'Inactive'";
$res_users = mysqli_query($link,$sql_users);
if($res_users && mysqli_num_rows($res_users) > 0)
{
while($log_row_users = mysqli_fetch_assoc($res_users))
{
$status = $log_row_users["status"];
}
}
}
$res_users = mysqli_query($link ,$sql_users);
}
if(isset($_POST['delete_all']))
{
}
?>
<script>
$(document).ready(function()
{
$(".delete_button").on('click',function()
{
var result =confirm("Are you sure you want to delete ?");
if(result)
{
return true;
}
else
{
return false;
}
});
});
//function wantTodelete(user_id)
//{
// return confirm("Are you sure you want to delete ?");
//}
$(document).ready(function()
{
$("#checkAll").change(function() {
$("input:checkbox").prop('checked', $(this).prop("checked"));
});
});
</script>
<table border="1px" class="manage_table">
<form name="listingForm" action="" method="post">
<tr>
<?php
if($error_array !=0)
{
foreach($error_array as $value)
{
echo "<tr style='color:green;'><td></td><td> ". $value. "</td></tr>";
}
}
?>
</tr>
<tr>
<td></td>
<td><input type="text" name="firstName"></td>
<td><input type="text" name="lastName"></td>
<td><input type="text" name="email"></td>
<td>
<select name="status">
<option>Select Status </option>
<option value="Active" <?php echo $status;?>>Active </option>
<option value="Inactive" <?php echo $status;?>>Inactive </option>
</select>
</td>
<td><input style="width:135px" type="submit" name="Search" value="Search"></td>
<td><input type="submit" id="delete_all" name="delete_all" value="Delete All" onclick="return deleteAll();" /></td>
</tr>
<tr>
<th>Sr.No</th>
<th>First Name</th>
<th>Last Name</th>
<th>Email</th>
<th>Status</th>
<th>Action</th>
<th><input type="checkbox" id="checkAll" name="check_all[]"/></th>
</tr>
<?php
if($log_row_users = mysqli_fetch_assoc($res_users))
{
$user_id = $log_row_users['user_id'];
$firstName = $log_row_users['firstName'];
$lastName = $log_row_users['lastName'];
$email = $log_row_users['email'];
$status = $log_row_users['status'];
?>
<tr>
<td><?php echo $count++ ;?></td>
<td><?php echo $firstName;?></td>
<td><?php echo $lastName ;?></td>
<td><?php echo $email ;?></td>
<td>
<?php
if($status == "Active")
{
echo "<b style='color:#3CF'>".$status."</b>";
}
if($status == "Inactive")
{
echo "<b style='color:#F00'>".$status."</b>";
};
?>
</td>
<td>
<a style="margin-left:25px" href="http://localhost/sample/home_page_edit.php?user_id=<?php echo $user_id;?>" onclick="redirectMe();" name="redirect" id="redirect"><img src="images/pencil.png" /></a>
<a style="margin-left:35px" href="http://localhost/sample/home_page_manage.php?user_id=<?php echo $user_id;?>" name="delete_button" class="delete_button" ><img src="images/delete.png" /></a>
</td>
<th>
<input name="checkbox[]" type="checkbox" id="checkbox[]" class="checkbox">
</th>
</tr>
</form>
<?php
}
?>
</table>
<?php
include "includes/home_page_footer.php";
?>
它應該是'$結果= mysqli_query（$的SQL）; while（$ row = mysqli_fetch_array（$ result））：[...] endwhile;'，但是，也許你的查詢返回一個空的結果，所以它導致錯誤？在提取它們之前檢查你的結果是不是null。請注意，你有很多注入點，搜索如何防止SQLi注入。對於速度查詢，你可以這樣做：'foreach（$ db-> query（$ sql）as $ row）：[...] endforeach;' – KDOT