I'm having trouble checking as to why my echo statement does not appear. I am using a web hosting service so I can use PHP scripts (double checked using simple echo "Hello World!" PHP scripts before). My file does have a .php file extension.
My goal is to simply add two numbers using PHP function from two inputs and just display the result.
<body>
<div>
<form action="index.php">
Enter First Number:<br>
<input type="text" name="first_input" value="">
<br>
Enter Second Number:<br>
<input type="text" name="second_input" value=""><br>
<input type="submit" value="Calculate">
</form>
<?php
function Calc_Addition() {
$first_input = filter_input(INPUT_GET, 'first_input');
$second_input = filter_input(INPUT_GET, 'second_input');
$amount_output = $first_input + $second_input;
echo "$amount_output";
}
?>
</div>
</body>
You need to both parse the input values as numbers (or pass them as such) and execute the function you're calling, like so:
<body>
<div>
<form action="index.php" method="get">
Enter First Number:<br>
<input type="text" name="first_input" value="">
<br>
Enter Second Number:<br>
<input type="text" name="second_input" value=""><br>
<input type="submit" value="Calculate">
</form>
<?php
function Calc_Addition() {
$first_input = intval($_GET['first_input']);
$second_input = intval($_GET['second_input']);
$amount_output = $first_input + $second_input;
echo $amount_output;
}
if(isset($_GET['first_input'])) {
Calc_Addition();
}
?>
</div>
</body>
You need to execute the function. You aren't doing so
<body>
<div>
<form action="index.php">
Enter First Number:<br>
<input type="text" name="first_input" value="">
<br>
Enter Second Number:<br>
<input type="text" name="second_input" value=""><br>
<input type="submit" value="Calculate">
</form>
<?php
//Check if isset, then execute function
if (isset($_GET['first_input'])) {
Calc_Addition();
}
function Calc_Addition() {
$first_input = filter_input(INPUT_GET, 'first_input');
$second_input = filter_input(INPUT_GET, 'second_input');
$amount_output = $first_input + $second_input;
echo "$amount_output";
}
?>
</div>
</body>
I think you need to cast your $first_input and $second_input variables as int's before adding them. So $amount_output would read as follows:
$amount_output = intval($first_input) + intval($second_input);
Related
Here is a code that I've made:
<form method="post" action="test.php">
<input type="text" name="name" placeholder="name"/><br />
<input type="submit" value="Validate" />
</form>
<?php
$sum=0;
if(isset($_POST['name'])){
$sum+=1;
}
echo "sum = $sum";
?>
When I enter some text in the form and click Validate, the page display sum=1, but after this, when I enter nothing in the form and click Validate, the page STILL displays sum=1.
Why does the variable $sum is not reloaded between the two Validate ? Is there a way to escape it ?
Thanks
This will solve the issue
<?php
$sum=0;
if(isset($_POST['name']) && $_POST['name'] != ''){
$sum+=1;
}
echo "sum = $sum";
?>
This is because isset() checks for the existence of the $_POST variable. In your case, the $_POST variable exists and has an empty string value.
Your code will work if you change isset() to !empty() like so;
<form method="post" action="test.php">
<input type="text" name="name" placeholder="name"/><br />
<input type="submit" value="Validate" />
</form>
<?php
$sum=0;
if(!empty($_POST['name'])){
$sum+=1;
}
echo "sum = $sum";
?>
More about the empty() function here.
Another way would be to check the request that your client has made on your page. So that if it is a simple refresh (not with a form refresh), it is a GET request and so, the variable should not be incremented and if the form has been sent, then you can do whatever you want such as incrementing the data.
So if the client is sending the form with an input text filled, then you can increment the value. In all other cases, the value should remain a zero.
<form method="post" action="test.php">
<input type="text" name="name" placeholder="name"/><br />
<input type="submit" value="Validate" />
</form>
<?php
$sum=0;
if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['name']) && !empty($_POST['name']))
{
$sum++; /* strictly equivalent to: $sum += 1; */
}
?>
<samp>sum = <?php echo $sum; ?></samp>
Try this
<form method="post" action="test.php">
<input type="text" name="name" placeholder="name"/><br />
<input type="submit" name="submit" value="Validate" />
</form>
<?php
$sum=0;
if(isset($_POST['submit'])){
$sum+=1;
}
echo "sum = $sum";
?>
You can try below:
if(isset($_POST['name']) && strlen($_POST['name'])>0){
$sum+=1;
You have the code appending 1 to variable $sum
but your if statement is based on the name field being passed.
Not if the name field has any data in it.
So... you have made your code add 1 as long as name field is passed,
regardless if it has text input or not.
Also, you should reassign the varible to reset it.
+= should just be =
<form method="post" action="test.php">
//----------------------------- add empty value to input ------------
<input type="text" name="name" value="" placeholder="name"/><br />
<input type="submit" value="Validate" />
</form>
<?php
$sum=0;
if(isset($_POST['name'])){
$sum=1;
}
echo "sum = $sum";
?>
I am new to PHP, I have mentioned below my HTML and PHP codes. I am not able to get the textbox value to PHP. I have mentioned below both HTML and PHP codes.
HTML Code:
Section <input type="text" name="f_b1_s1_sec" id="f_b1_s1_sec">
Content <input type="text" name="f_b1_s1_con" id="f_b1_s1_con"><br><br>
Para <input type="text" name="f_b1_s1_para" id="f_b1_s1_para">
PHP Code:
$tx0 = $_POST["f_b1_s1_sec"];
$tx1 = $_POST["f_b1_s1_con"];
$tx2 = $_POST["f_b1_s1_para"];
Please Clarify.
Thank you!
Try this:
<?php
if( isset( $_POST["go"] ) {
$tx0 = $_POST["f_b1_s1_sec"];
$tx1 = $_POST["f_b1_s1_con"];
$tx2 = $_POST["f_b1_s1_para"];
}
?>
<form action="insertyourphp.php" method="post">
Section <input type="text" name="f_b1_s1_sec" id="f_b1_s1_sec">
Content <input type="text" name="f_b1_s1_con" id="f_b1_s1_con"><br><br>
Para <input type="text" name="f_b1_s1_para" id="f_b1_s1_para">
<input type="submit" name="go" value="Go">
</form>
I would like to add an input element to the form dynamically using only PHP.
I know how to make this using php and JavaScript combination, thus do nto advice abotu JavaScript.
The example below does not work. Could you please advice and comment:
input.php
<br> <input type="text" name="mob[]" value="" size="3" >
form.php
<?php
if( isset($_POST['AddNum']) ){
$AddNumCount=$_POST['AddNumCount'];
$AddNumCount=$AddNumCount+1;
echo $AddNumCount;
}
if( isset($_POST['register']) ){
print_r($_POST['register']);
}
if (!isset($AddNumCount)) {$AddNumCount=5;}
?>
<form action="" method="post" id="form1" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" >
<br>
<?php for ($i=0; $i<$AddNumCount; $i++) { Include('input.php'); } ?>
<br> Add number: <input type="submit" name="AddNum" form="form1" value="Add NUmber"> </p>
<input type="hidden" name="AddNumCount" form="form1" value=" <?php $AddNumCount; ?> "> </p>
<br></form><input type="submit" name="register" id="regcont" value="register"> </p>
</form>
Maybe you know how to make single submit button for many forms?
I mean each input would be a separare form and all forms can be submittted with the button on the end?
You use two action attrs. Maybe you mean:
<form method="post" id="form1" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" >
For submitting many forms by one button - you need to use JavaScript and send them in cycle via AJAX.
I am sorry i change this post. This is working example for dynamical PHP.
Use EXform.php. Other files are generated or helping.
Maybe it is also possible to make this using Session variables and header for redirecting to regenerated webpage.
EXform.php
<?php if (isset( $_POST['AddNum'])) { Include("GENinput.php"); } ?>
<?php if (!isset( $_POST['AddNumCount'])) { $_POST['AddNumCount']=1; Include("GENinput.php"); } ?>
<form action="" method="post" id="form1" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" >
<?php Include("INCinput.php"); ?>
<br> Add number: <input type="submit" name="AddNum" form="form1" value="Add NUmber"> </p>
<input type="hidden" name="AddNumCount" form="form1" value="<?php echo $AddNumCount; ?>"> </p>
<input type="submit" name="register" id="regcont" value="register"> </p>
<br></form>
</form>
GENinput.php // generates included file
<?php
if( isset($_POST['AddNum']) ){
$AddNumCount=$_POST['AddNumCount']; //=
$fnameinp="INCinput.php";
$fileinp=fopen($fnameinp,"w");
$_POST['AddNumCount']=$AddNumCount=$AddNumCount+1;
//echo "AddNumCount=".$AddNumCount;
$strV=""; $stri="";
for ($i=0; $i<$AddNumCount; $i++) {
$strV.=" \n
<?php
if( isset(\$_POST['v']['tname']['colname'][".$i."]) )
{ \$v['tname']['colname'][".$i."]=\$_POST['v']['tname']['colname'][".$i."];}
else { \$v['tname']['colname'][".$i."]=".$i."; }
?>
";
$stri.=" <br> <input type=\"text\" name=\"v[tname][colname][".$i."]\" value=\"<?php echo \$v['tname']['colname'][".$i."]; ?>\" > \n\n";
}
fwrite($fileinp,$strV);
fwrite($fileinp,$stri);
fclose($fileinp);
}
I'm trying to make a simple web application that adds scores from a physical game such as Scrabble. Most of the code is a HTML form, asking for one input per form element. It then puts the data generated from the form and initializes the appropriate variables. The one part I can't figure out is how to add the new score to the last score. I tried to add variables, like $lastScore, but that didn't seem to work either. Does anyone have any suggestions?
<?php
//Gets data from HTML form
$addScore1 = $_REQUEST['addScore1'];
$addScore2 = $_REQUEST['addScore2'];
//Generates HTML form
echo "<!DOCTYPE html>
<html>
<head>
<title>Score Add</title>
</head>
<body>
<div id=\"displayNames\">
<p>
$player1
<form method=\"post\" action=\"\">
<label for=\"addScore1\">Enter your score:</label>
<input type=\"text\" name=\"addScore1\" id=\"addScore1\" />
<input type=\"submit\" />
</form>
</p>
<p>
$player2
<form method=\"post\" action=\"\">
<label for=\"addScore2\">Enter your score:</label>
<input type=\"text\" name=\"addScore2\" id=\"addScore2\" />
<input type=\"submit\"/>
</form>
</p>
</div>
</body>
</html>";
?>
On submit, the script is calling itself and loses all the variables. You need to store their current score, e.g. in the session, in a database, or in a hidden field in the form.
With hidden field in your form:
<form method="post" action="">
<label for="addScore1">Enter your score:</label>
<input type="text" name="addScore1" id="addScore1" />
<--! the addition is done in the next line in value-->
<input type="hidden" name="oldScore1" id="oldScore1" value="<?=($oldscore1 + $addScore1)?>" />
<input type="submit" />
</form>
Do the same with your second form --> oldScore2 etc...
At the top of your script, read the oldscore from $_REQUEST
//Gets data from HTML form
$addScore1 = $_REQUEST['addScore1'];
$addScore2 = $_REQUEST['addScore2'];
$oldScore1 = $_REQUEST['oldScore1'];
$oldScore2 = $_REQUEST['oldScore2'];
// as alternative, do the addition here:
$oldScore1 += $addScore1;
$oldScore2 += $addScore2;
Rewriting your code as a whole, try it:
I edited all those <?php=$somevalue?>because they don't seem to work with your PHP-setup, and replaced them with <?php echo $somevalue> ?>... let me know how it works...
<?php
// Get data from HTML form. $_POST is fine, because form method is set to POST.
$addScore1 = $_POST['addScore1'];
$addScore2 = $_POST['addScore2'];
$oldScore1 = $_POST['oldScore1'];
$oldScore2 = $_POST['oldScore2'];
// if these are numeric values, add them up
if (is_numeric($addScore1) && is_numeric($oldScore1)) $oldScore1 += $addScore1;
if (is_numeric($addScore2) && is_numeric($oldScore2)) $oldScore2 += $addScore2;
// Generate HTML form -- in HTML, much to complicated in PHP, unless it is necessary for sth else
?>
<html>
<head>
<title>Score Add</title>
</head>
<body>
<div id="displayNames">
<p><?php echo $player1; ?> current score: <?php echo $oldScore1; ?>
<form method="post" action="">
<label for="addScore1">Enter your score:</label>
<input type="text" name="addScore1" id="addScore1" />
<input type="hidden" name="oldScore1" id="oldScore1" value="<?php echo $oldscore1; ?>" />
<input type="submit" />
</p>
<p><?php echo $player2; ?> current score: <?php echo $oldScore2; ?>
<label for="addScore2">Enter your score:</label>
<input type="text" name="addScore2" id="addScore2" />
<input type="hidden" name="oldScore2" id="oldScore2" value="<?php echo $oldscore2; ?>" />
<input type=\"submit\"/>
</form>
</p>
</div>
</body>
</html>
Sorry if this is a rather basic question.
I have a page with an HTML form. The code looks like this:
<form action="submit.php" method="post">
Example value: <input name="example" type="text" />
Example value 2: <input name="example2" type="text" />
<input type="submit" />
</form>
Then in my file submit.php, I have the following:
<?php
$example = $_POST['example'];
$example2 = $_POST['example2'];
echo $example . " " . $example2;
?>
However, I want to eliminate the use of the external file. I want the $_POST variables on the same page. How would I do this?
Put this on a php file:
<?php
if (isset($_POST['submit'])) {
$example = $_POST['example'];
$example2 = $_POST['example2'];
echo $example . " " . $example2;
}
?>
<form action="" method="post">
Example value: <input name="example" type="text" />
Example value 2: <input name="example2" type="text" />
<input name="submit" type="submit" />
</form>
It will execute the whole file as PHP. The first time you open it, $_POST['submit'] won't be set because the form has not been sent.
Once you click on the submit button, it will print the information.