PHP XML problem solving Write a PHP script that accepts HTTP GET and POST reques
ID: 3794866 • Letter: P
Question
PHP XML problem solving
Write a PHP script that accepts HTTP GET and POST requests. When sent a GET request, your script should generate HTML markup containing a simple form with a text input box like that shown below. Enter XML: The user is allowed to enter simple XML into the text box to perform an arithmetic operation, by specifying the type of operation: add/subtract/multiply/divide, and a pair of numbers on which to perform the operation. When the user clicks the Submit button shown above, the PHP script should be sent a POST request with the XML entered by the user. Your script will need to parse the XML to perform the requested arithmetic operation. Ensure that your script can parse and understand the XML code below and perform the requested 'add' operation. add 5 3 The parser should also be able to handle the other arithmetic operations including subtract, multiply and divide. It should also report parse errors and invalid arithmetic operations, and handle divide-by-zero errors.Explanation / Answer
to create a html form
<html>
<body>
<form action="oper.asp" method="get">
Enter xml <input type="text" name="name"><br>
<input type="submit">
</form>
</body>
</html>
welcome.php
<html>
<body>
Enter xml <?php echo $_GET["name"]; ?><br>
</body>
</html>
oper.asp
<%
'--------------------------------------------------------------------
'The "ConvertFormtoXML" Function accepts to parameters.
'strXMLFilePath - The physical path where the XML file will be saved.
'strFileName - The name of the XML file that will be saved.
'--------------------------------------------------------------------
Function ConvertFormtoXML(strXMLFilePath, strFileName)
'Declare local variables.
Dim objDom
Dim objRoot
Dim objField
Dim objFieldValue
Dim objPI
Dim x
'Instantiate the Microsoft XMLDOM.
Set objDom = server.CreateObject("Microsoft.XMLDOM")
objDom.preserveWhiteSpace = True
'Create your root element and append it to the XML document.
Set objRoot = objDom.createElement("contact")
objDom.appendChild objRoot
'Iterate through the Form Collection of the Request Object.
For x = 1 To Request.Form.Count
'Check to see if "btn" is in the name of the form element.
'If it is, then it is a button and we do not want to add it
'to the XML document.
If instr(1,Request.Form.Key(x),"btn") = 0 Then
'Create an element, "enter xml".
Set objField = objDom.createElement("enter xml")
'Create a new element, "field_value".
Set objFieldValue = objDom.createElement("field_value")
'Set the value of the field_value element equal to
'the value of the current field in the Form Collection.
objFieldValue.Text = Request.Form(x)
'Append the field element as a child of the root element.
objRoot.appendChild objField
'Append the field_value element as a child of the field elemnt.
objField.appendChild objFieldValue
End If
Next
'Create the xml processing instruction.
Set objPI = objDom.createProcessingInstruction("xml", "version='1.0'")
'Append the processing instruction to the XML document.
objDom.insertBefore objPI, objDom.childNodes(0)
'Save the XML document.
objDom.save strXMLFilePath & "" & strFileName
'Release all of your object references.
Set objDom = Nothing
Set objRoot = Nothing
Set objField = Nothing
Set objFieldValue = Nothing
Set objPI = Nothing
End Function
'Do not break on an error.
On Error Resume Next
'Call the ConvertFormtoXML function, passing in the physical path to
'save the file to and the name that you wish to use for the file.
ConvertFormtoXML "c:","Contact.xml"
'Test to see if an error occurred, if so, let the user know.
'Otherwise, tell the user that the operation was successful.
If err.number <> 0 then
Response.write("Errors occurred while saving your form submission.")
Else
Response.write("Your form submission has been saved.")
End If
%>
oper.xml
<? xml version='1.0' encoding='UTF-8'?>
<arithmetic>
<add>1 2 </add>
<subtract>10 2 </subtract>
<multipy>10 2 </multiply>
<divide>20 2 </divide>
</arithmetic>
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