set value of input field by php variable s value

Question

I have a simple php calculator which code is    lt html gt       lt head gt           lt title gt PHP calculator lt  title gt       lt  head gt        lt body bgcolor  orange  gt           lt h1 align  center  gt This is PHP Calculator lt  h1 gt           lt center gt               lt form method  post  action  phptest php  gt                  Type Value 1  lt br gt  lt input type  text  name  value1  gt  lt br gt                  Type value 2  lt br gt  lt input type  text  name  value2  gt  lt br gt                  Operator  lt br gt  lt input type  text  name  sign  gt  lt br gt                  Result  lt br gt  lt input type text  name  result  gt                   lt div align  center  gt                       lt input type  submit  name  submit  value  Submit  gt                   lt  div gt               lt  form gt           lt  center gt    lt  php     if isset   POST  submit               value1   POST  value1             value2   POST  value2             sign   POST  sign             if  value1                    echo   lt script gt alert  Please Enter Value 1   lt  script gt                exit                       if  value2                    echo   lt script gt alert  Please Enter Value 2   lt  script gt                exit                       if  sign                     echo  Your answer is       value1  value2              exit                       if  sign   -                 echo  Your answer is       value1- value2              exit                       if  sign                     echo  Your answer is       value1  value2              exit                       if  sign                     echo  Your answer is       value1  value2              exit                      gt    All I want to do is that answer should be displayed in the result input field instead of echoing them separately  Please help  I Know it s simple but I am  new in PHP

User · Accepted Answer

One way to do it will be to move all the php code above the HTML, copy the result to a variable and then add the result in the <input> tag.
Try this -

<?php
//Adding the php to the top.
if(isset($_POST['submit']))
{
    $value1=$_POST['value1'];
    $value2=$_POST['value2'];
    $sign=$_POST['sign'];
    ...
        //Adding to $result variable
    if($sign=='-') {
      $result = $value1-$value2;
    }
    //Rest of your code...
}
?>
<html>
<!--Rest of your tags...-->
Result:<br><input type"text" name="result" value = "<?php echo (isset($result))?$result:'';?>">

User · Answer

inside the Form  You can use this code  Replace your variable name  i use  variable    lt input type  text  value   lt  php echo  isset  variable    variable      gt   gt

[php] set value of input field by php variable's value

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