|
PHP - Check If Php Variable Is Empty
i am pulling the login date from the databases and i want it to check if the variable is empty and if it is echo Never Loged In and if it not empty echo the date
<?php include'db.php'; $id=$_GET['id']; $sql=mysql_query("SELECT * FROM admin WHERE id='$id'")or die(mysql_error()); while($row=mysql_fetch_array($sql)) { $date=$row['login_date']; if($date > 0) { echo"Never Loged In"; } else { echo"$date"; } } ?> Similar TutorialsI have two array, how I can have if else to check if both array1 and array2 are empty? if (empty both arrays) { } else { even if one of them are not empty } Hi, I have a form containg three text inputs and one text area. On the php page that processes the form, I want to check first to make sure the user entered something (input field is not empty) before processing the form. I'll just provide a skeleton of form processing page below. *(I'm save space and time by omitting the form itself but he text inputs fields have the following name attributes "name", "company", "email", and the textarea field's name attribute is "message" ) I'll do my best to explain the code in further detail within the code comments. Code: [Select] <?php //Turn on output buffering. Allows for headers to be called anywhere on script. See pg228 Ulman. ob_start(); if (isset($_POST['submit'])) { // Initialize a session to keep tract of error and success messages: session_start(); //Define a session variable that keeps tract of how many times user accesses page. $_SESSION['views'] = 1; // Connect to the database. require('config/config.php'); //Check for errors. //Check to make sure they entered their name. if (!empty ( $_POST['name'])) { $a = TRUE; } else { $a = FALSE; //This variable will be echoed on the form if field is missing a value $_SESSION['name'] = '*Please enter a valid name.'; } //Check to make sure they entered their company name. if (!empty ( $_POST['company'])) { $b = TRUE; } else { $b = FALSE; //This variable will be echoed on the form if field is missing a value $_SESSION['company'] = '*Please enter the name of an institution you are affiliated with.'; } //Check to make sure email is valid. if(eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $_POST['email'])) { $c = TRUE; }else { $c = FALSE; //This variable will be echoed on the form if field is missing a value or email format is wrong. $_SESSION['email'] = '*Please enter a valid email address.'; } //Check to make sure they entered their message. if (!empty ( $_POST['message'])) { $d = TRUE; } else { $d = FALSE; //This variable will be echoed on the form if field is missing a value $_SESSION['message'] = '*Please enter your message.'; } //If no errors if (empty($_SESSION['name'] ) && empty($_SESSION['company'] ) && empty($_SESSION['email'] ) && empty($_SESSION['message'] ) ) { //Insert data into database. $query = "INSERT INTO table... ; $result = mysql_query($query) or die("Data could not be inserted into table because: " .mysql_error()); if (mysql_affected_rows() == 1) { // Display success message //This variable will be echoed on the form if everything is filled out correctly. $_SESSION['sent'] = "Your email has been sent. We will get back to you shortly."; // Display contact page (the page containing the form) header("Location: contact_page.php"); exit(); }else{die(mysql_error());} //Display error messages. } else {// if errors array is not empty // Display page (page containing the form) header("Location: contact_page.php"); exit(); }//End of if there are errors. }//End of if submit. ?> So there it is. Everything works fine except that the part which checks if the textarea (named "message") is empty, doesn't work. If I click the submit button without filling out any field, the appropriate error messages are printed for the text input fields but not the text area field. If I fill out all fields correctly and leave the "message" field blank, the form gets processed correctly and values are placed in the database and the success message is printed out. This is also the case when I enter a value for "message" textarea field. Now I tried something. I changed the textarea to a text field and the $_SESSION['message'] variable finally got echoed when I left this field blank. So apparently, the problem arises from the fact that the named attribute from a textarea tag is not being processed correctly?? Who knows what's going wrong here? I have the form / script below that works to add multiple rows of data with one query. One thing I did not think about is what if the first set of form fields are filled and the second is not. Currently the script insert an empty row. I'm sure how I would go about checking for an empty row and if there is an empty row ignore it and do not put it in the DB. Can someone point me in the right direction? Code: [Select] <?php // Begin the script for this page if (isset($_POST['submit'])) { //Assign each array to a variable $id = $_POST['id']; $store = $_POST['store']; $item = $_POST['item']; $itemprice = $_POST['itemprice']; $itemnumber = $_POST['itemnumber']; $couponvalue = $_POST['couponvalue']; $couponsused = $_POST['couponsused']; $limit = count($id); $values = array(); // initialize an empty array to hold the values for($i=0;$i<$limit;$i++){ $store[$i] = check_input($store[$i]); $item[$i] = check_input($item[$i]); $itemprice[$i] = check_input($itemprice[$i]); $itemnumber[$i] = check_input($itemnumber[$i]); $couponvalue[$i] = check_input($couponvalue[$i]); $couponsused[$i] = check_input($couponsused[$i]); $values[$i] = "( '{$id[$i]}', '{$store[$i]}', '{$item[$i]}', '{$itemprice[$i]}', '{$itemnumber[$i]}', '{$couponvalue[$i]}', '{$couponsused[$i]}')"; // build the array of values for the query string } $query = "INSERT INTO `item` (user_id, store, item, itemprice, itemnumber, couponvalue, couponsused) VALUES " . implode( ', ', $values ); // Form the query string and add the implod()ed values if (!mysql_query($query,$link)){ die('Error: ' . mysql_error()); } else { $added = "Your items have been added."; } } ?> <div class="pageContent"> <div id="main"> <div class="container"> <?php echo $added; if($_SESSION['id']){ echo '<form action="" method="post">'; echo '<table cellpadding= "4">'; echo '<tr>'; echo '<input type="hidden" name="id[]" id="id[]" value='.$_SESSION['id'].' />'; echo '<td><DIV CLASS="p2"><b>Store</b></div>'; echo '<input type="text" name="store[]" id="store[]" size="15" maxlength="255"/></td>'; echo '<td><DIV CLASS="p2"><b>Item</b></div>'; echo '<input type="text" name="item[]" id="item[]" size="15" maxlength="255"/></td>'; echo '<td><DIV CLASS="p2"><b>Item Price</b></div>'; echo '<input type="text" name="itemprice[]" id="itemprice[]" size="5" maxlength="255"/></td>'; echo '<td><DIV CLASS="p2"><b>Item #</b></div>'; echo '<select name="itemnumber[]" id="itemnumber[]"><option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option><option value="6">6</option><option value="7">7</option><option value="8">8</option><option value="9">9</option><option value="10">10</option><option value="11">11</option><option value="12">12</option><option value="13">13</option><option value="14">14</option><option value="15">15</option><option value="16">16</option><option value="17">17</option><option value="18">18</option><option value="19">19</option><option value="20">20</option></select></td>'; echo '<td><DIV CLASS="p2"><b>Coupon Value</b></div>'; echo '<input type="text" name="couponvalue[]" id="couponvalue[]" size="10" maxlength="255"/></td>'; echo '<td><DIV CLASS="p2"><b># Coupons</b></div>'; echo '<select style="width: 60px;" name="couponsused[]" id="couponsused[]"><option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option><option value="6">6</option><option value="7">7</option><option value="8">8</option><option value="9">9</option><option value="10">10</option><option value="11">11</option><option value="12">12</option><option value="13">13</option><option value="14">14</option><option value="15">15</option><option value="16">16</option><option value="17">17</option><option value="18">18</option><option value="19">19</option><option value="20">20</option></select></td>'; echo '<td><DIV CLASS="p2"><b>Doubled Coupon</b></div>'; echo '<select style="width: 75px;" name="doubledcoupon[]" id="doubledcoupon[]"><option value="1">Yes</option><option value="0">No</option></td>'; echo '</tr>'; echo '<tr>'; echo '<input type="hidden" name="id[]" id="id[]" value="'.$_SESSION['id'].'" />'; echo '<td><input type="text" name="store[]" id="store[]" size="15" maxlength="255"/></td>'; echo '<td><input type="text" name="item[]" id="item[]" size="15" maxlength="255"/></td>'; echo '<td><input type="text" name="itemprice[]" id="itemprice[]" size="5" maxlength="255"/></td>'; echo '<td><select name="itemnumber[]" id="itemnumber[]"><option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option><option value="6">6</option><option value="7">7</option><option value="8">8</option><option value="9">9</option><option value="10">10</option><option value="11">11</option><option value="12">12</option><option value="13">13</option><option value="14">14</option><option value="15">15</option><option value="16">16</option><option value="17">17</option><option value="18">18</option><option value="19">19</option><option value="20">20</option></select></td>'; echo '<td><input type="text" name="couponvalue[]" id="couponvalue[]" size="10" maxlength="255"/></td>'; echo '<td><select style="width: 60px;" name="couponsused[]" id="couponsused[]"><option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option><option value="6">6</option><option value="7">7</option><option value="8">8</option><option value="9">9</option><option value="10">10</option><option value="11">11</option><option value="12">12</option><option value="13">13</option><option value="14">14</option><option value="15">15</option><option value="16">16</option><option value="17">17</option><option value="18">18</option><option value="19">19</option><option value="20">20</option></select></td>'; echo '<td><select style="width: 75px;" name="doubledcoupon[]" id="doubledcoupon[]"><option value="1">Yes</option><option value="0">No</option></td>'; echo'</tr>'; echo'<tr>'; echo '<input type="submit" name="submit" value="Submit Item">'; echo'</tr>'; echo '</table>'; echo'</form>'; } else { echo '<h1>Please, <a href="index.php">login</a> and come back later!</h1>'; } ?> </div> </div> </div> Ok so i have registration page on my webs but i didn't work on empty fields so how could i check all fields? Code: [Select] //if no name if(!$name){ $error = "Username missing."; } //if no pass if($pass == false){ $error = "$error,Password missing"; } //if no pass conf if($pass_conf == false) { $error = "$error,Pass conf missing."; } //if no email if($email == false){ $error = "$error,Email missing."; } //pass conf if($pass != $pass_conf){ $error = "$error,Passwords do not match."; } echo "<script>alert('$error');</script>;"; //header("Location: register.php"); My script gives same results every time (even if i fill any of fields)...also if i un-comment header command it wont show alert..it just reloads the page So can anyone help me with this? Thanks.. Hi i would like to know what is the best way to check if a textarea or an input box is empty. Is the empty function effective? Been trying to find an answer and keep running around in circles... I have: ( left test echos in there) if ($r['left_house_number'] != '') { /* Now see what they are supposed to get */ $left_customer_query = "SELECT * FROM customer WHERE house_number ='".$r['left_house_number']."' AND street = '".$r['left_house_street']."' AND route_number = '".$_SESSION['route_number']."'"; // echo "SELECT * FROM customer WHERE house_number ='".$r['left_house_number']."' AND street = '".$r['left_house_street']."' AND route_number = '".$_SESSION['route_number']."'"; $left_customer_result = mysql_query($left_customer_query) or die(mysql_error()); $left_customer_result_count = mysql_num_rows($left_customer_result); echo $r['left_house_number'].' =lhn1'; while ($lrow = mysql_fetch_array($left_customer_result)) { echo $r['left_house_number'].' =lhn2'; /* See if there is any customer if not display blank row */ echo $left_customer_result_count.' = count '; if ($left_customer_result_count < 1) { echo $r['left_house_number'].' =lhn3'; echo '<span class="delivery_nothing">'.$r['left_house_number'].' </span> 1<span class="delivery_nothing">'.$r['left_house_street'].' '; } else { /* Have a customer, now check to see if they are supposed to get something */ if ($lrow['status'] != "AC" && $lrow['status'] != "VH") { /* Customer is stopped or on vacation so show house number and street not bolded */ echo '<span class="delivery_nothing">'.$r['left_house_number'].'</span>2<span class="delivery_nothing">'.$r['left_house_street']; echo $r['left_house_number'].' =lhn4'; } else { /* Now check for correct delivery day and return data */ if (Show_Product($lrow['product']) == '1') { echo $r['left_house_number'].' =lhn5'; echo '<span class="delivery_bold">'.$lrow['house_number'].'</span><span class="delivery_bold">'.$lrow['placement'].'</span><span class="delivery_bold">'.$lrow['street'].'</span>'; echo Product_Formater($lrow['product']); } I have tried... if ($left_customer_result_count < 1) { if ($left_customer_result_count == 0) { if ($left_customer_result_count == '') { if ($left_customer_result_count === 0) { And I can't get it to work. the count "test echo" is either blank or 1 If I echo the sql statement with values I know aren't in the db and paste it into phpmyadmin: SELECT * FROM customer WHERE house_number = '3333' AND street = 'Chili Avenue' AND route_number = '68-24-630' I get: "MySQL returned an empty result set" And if I change it to something that is in the db: SELECT * FROM customer WHERE house_number = '3019' AND street = 'Chili Avenue' AND route_number = '68-24-630' I get: "Showing rows 0 - 0 (1 total, Query took 0.0012 sec)" So what do I have to do to get this to work right? What does it actually output when there are no results returned? thanks, i am trying to check if the array element (which would be a file) is null or not. when i run it, uploading one file, it says "Please select some files to upload first!" X 3. what am i doing wrong? my code: http://pastebin.com/m0k3fEd2 Now this one is a bit of a shit head. I am using a really comprehensive class i found on on the web for upload / re-size / crop but i want to be able to override it's error handling and i am not good enough to start modifying the code in the class with out fucking it up. Firstly i will show you how i have invoked the class. Code: [Select] if( isset($_FILES['image'] ) ) { //Class includes include("../scrips/php/cms/database.insert.class.php"); include ("../scrips/php/cms/img.upload.resize.crop.class.php.php"); //----------|Start: upload, resize & save $your_image = new _image; //----------| Upload orginal image $your_image->uploadTo = 'uploads/'; $upload = $your_image->upload($_FILES['image']); //----------| Resize and upload small thumbnail $your_image->newPath = 'thums/'; $your_image->newWidth = 50; $your_image->newHeight = 50; $resized = $your_image->resize(); //----------| Resize and upload medium thumbnail $your_image->newPath = 'thums2/'; $your_image->newWidth = 100; $your_image->newHeight = 100; $resized = $your_image->resize(); //----------| Getting the image name to insert into the database futher on in the code $name = $resized; $img_str = explode("/",$name); $final_img_name = $img_str['1']; echo "Article has been added!"; //----------------|end //----------------| Start database insert (class manipulation) $table = "blog_posts"; $title = "'".$_POST['ArticleTitle']."',"; $img = "'".$final_img_name."',"; $post = "'".$_POST['ArticleBody']."',"; $aurthor_id = "'1',"; $category_id = "'".$_POST['Category']."',"; $date_posted = "NOW()"; $values = array("$title","$img","$post","$aurthor_id","$category_id","$date_posted"); $fields = array('title,','img,','post,','aurthor_id,','category_id,','date_posted'); $obj= new DatabaseInsert; $obj->DatabaseConnectionRequire(); $obj->ArticleInsert($values,$fields,$table); //----------------|end } As you can see it's fairly basic. What i want to do is before it runs this script and starts including/invoking the class etc, i want to be able to check to see if there is a value been posted from a FILE FORM OBJECT and if there is to proceed with this script, alternatively i want it to execute another code which will handle it in regards to the concept of my page. A simple javascript alert with be ok providing it reloaded the page to it's default state. If any one can help me here i would appreciate it a lot. Thanks Code: [Select] Array ( [Comment] => Array ( [post_id] => 1 [name] => cc [email] => [body] => spam ) ) How can i check if email is empty or not? Is there any php built in function? Should i use foreach? Hey guys, Really dumb question, but I want to check if a bunch of variables are all not empty. Then, if they aren't, I want to execute a mySQL query. Right now I have this which I know is wrong because it doesn't work the right way: Code: [Select] if($album != null || $artist != null || $year != null || $genre != null) { // stuff here... } Obviously I want all of those variables to be checked if they are empty or not. I did a quick Google and found that checking if the variables are null wouldn't be the correct way of solving this situation because an "empty string" is still not null? Anyway, any help would be appreciated. I'm pretty sure it's really simple :p. I have this line in my code $result2 = mysqli_query($link, 'Select * from categories where cat_loc ='.$nav['id']); how do I say "if $result2 is empty or false"? (basically if it didn't find any cat_loc = to $nav['id']) to echo '</li>'; I'll try to explain this as easily as possible. I'm working on making a little link shortener site just for fun/practice as a beginner with php. I originally used the source code 'lilurl' as a base to start out, but now I'm adding stuff to it for actual practice. I need some help though. I have two files, my index and my external php file. The external file is called on at the beginning of the index with require_once. The user submits a url into the PHP_SELF form and a url is returned, and it works all great. Now I'm trying to add the option to make a custom url suffix. Code: [Select] <form action="<?php echo $_SERVER['PHP_SELF']?>" method="post"> <fieldset> <label for="longurl">Enter a URL:</label> <input type="text" name="longurl" id="longurl" /> <input type="text" name="suffix" id="suffix" /> <input type="submit" name="submit" id="submit" value="Shrink!" /> </fieldset> </form>[/code] The form looks like this. I added the 'suffix' textbox. So after the user submits the code, it goes back up to the top (phpself). A variable is set for the url the user has inputted as "$longurl", like this. Code: [Select] $longurl = trim(mysql_escape_string($_POST['longurl']));So I added this. Code: [Select] $suffix = ($_POST['suffix']);And to check if it worked, I went down the the bottom of the index and had it echo the suffix variable. When I entered in code into the suffix text box, it would be echoed at the bottom of the page, so the variable did receive the value. So here's where the external file comes in. It is called on by require_once at the very beginning of the index. It is full of functions. One of the functions generates a random string of numbers (that I coded) to be used as the url suffix (uses the $id variable). So my plan was to erase the $id = $rand1 . blah blah stuff and put $id = $suffix. $suffix being the variable from the index that the user inputted. Make sense? Well whenever I try it, it always acts the like the variable is empty, even when I echo it on the index it returns the value of the textbox. Does anyone know what I'm doing wrong? Could it be because since I call on $suffix in the external file, and it's only been declared in the index that it's treating it like a new/empty variable? [spoiler] Someone also explained it to me like this. -I call upon the external file. -I declare the variable is the value of the text box. (Which means it's currently empty because the form has not been submitted.) -Then, the form is submitted as PHP_SELF. -The external file is called upon again. -The variable is then assigned a value. It's hard to explain, but basically that the variable in the external file is not told about the new value of the variable because they are declared after the external file is called upon? :\ So I tried moving the $suffix = ($_POST['suffix']); before the external file is called upon, but the same thing happens. It's hard to explain the situation, but I've tried a lot of things and can't get it to work.[/spoiler] Hello all, I am a beginner at PHP and trying to form an IF statement, I'm running into a problem which I cannot seem to solve. Due to my lack of syntax knowledge I would appreciate if someone could point me in the right direction. The combo variables are sent to this page through a form and defined as these variables at the top of the page. e.g $combo0 = $_POST["combo0"]; When the results are displayed any form field which was left blank or empty I want to show "N/A" if data is detected in being sent through the form I then want the "Else" statement to take affect. Currently when I run the below statement N/A is echoed despite if data was sent through the form fields or not.... if (empty($scrap)) { echo "<h3>Submitted Scrap Results</h3> No scrap parts were booked off"; } elseif (empty($combo0) || empty($combo1) || empty($combo2) || empty($combo3) || empty($combo4)) { echo "N/A"; } else { echo "<h3>Submitted Scrap Results</h3> <b>Reason:</b> " .$combo0." - ".$combo1." - ".$combo2." - ".$combo3." - ".$combo4." <br /> <b>on machine</b> " .$mid. " - <b>No. Scrap</b> " .$noscrap. ""; } Anyone any ideas? How would I write this in php?: Code: [Select] If $url does not begin with 'http://' $url = '' I want to assign nothing to the variable if it doesn't begin with http:// Thanks! I know the following simple demonstration fails and what to do to rectify it (though with a lot of additional code is necessary), but I don't know why this is the behaviour. It would be great if someone could explain to me why, and what the neatest way of fixing it would be. Code: [Select] +----------+--------------+------+-----+---------+ | Field | Type | Null | Key | Default | +----------+--------------+------+-----+---------+ | Id | int(11) | NO | PRI | NULL | | Name | varchar(45) | YES | | NULL | | Number | int(9) | YES | | NULL | Code: [Select] $name = "Bradley Cooper"; $number = ""; $query = "INSERT INTO table (Id, Name, Number) VALUES (1, '$name', $number)"; mysql_query($query); Because the $number variable is empty, this simple query fails. Logically, one would think that nothing or NULL gets inserted to that field since the MySQL structure rule states that default is NULL, and since nothing is fed to it in the query, I think that it would automatically be NULL since if the column is omitted, that is exactly the value that will be inserted. Enclosing the variable with quotes is not preferable since this field accepts integers. Also, converting the variable to an integer by (int)$number results in a 0, which is not what I want either. Checking if the variable is empty of not, and if it is, assign $number = "''" so that the query would succeed by enclosing the empty string with single quotes. But this creates a lot of unnecessary code (some of my tables are 80 columns wide and the query therefore have equal amount of variables). So to summarise, why is this happening and how do I neatly avoid assigning quotes to the empty strings? In other words, how do I insert nothing when variables that usually contain an integer is on occation empty? Is if($variable) the same as if(!empty($variable)), just different syntax? Hello Everyone, I am having issues where people are submitting null characters on my website (I.e. %00). Currently, I check if their is a value by using the empty function, and I also am checking if the value after running the trim command is =="". How can I check for these special characters to make sure that whatever they are submitting actually contains some sort of legitimate value? Thanks! I want an if statement that not only checks for the existence of a variable, but which also checks all the variables already created for one with a specific value. For example, I have a loop which creates variables, but I don't want it to make two variables with the same value. The problem is, using
if(isset(${'h'.$x}==false) && ${'h'.$x} != 3{
}
won't work since the variable equal to 3 could be named h4, whereas this one will be named h5. I hoped I explained this efficiently enough, sorry about any confusion.
Hi , I have a login page that i acces via www.mydomain.com/logib.php?last_visited_page.php however the passed in variable last_visited_page.com is not always set . once the login script has run , when the variable it is not set i would want jump to myaccount.php otherwise jump to last_visited_page.php How do i check for no variable beinf present and therefore jump to myaccount.php Many Thanks Fraser |
|||||||