How can I execute a PHP function in a form action

Question

I am trying to run a function from a PHP script in the form action  My code   lt  php require once    username php      echo    lt form name  quot form1 quot  method  quot post quot  action  quot username   quot  gt     lt p gt       lt label gt         lt input type  quot text quot  name  quot textfield quot  id  quot textfield quot  gt       lt  label gt     lt  p gt     lt p gt       lt label gt         lt input type  quot submit quot  name  quot button quot  id  quot button quot  value  quot Submit quot  gt       lt  label gt     lt  p gt   lt  form gt      gt   I echo the form but I want the function  quot username quot  which is called from username php to be executed  how can I do this in a simliar way to the above

User · Answer

I think it should be like this     lt  php require once    username php      echo    lt form name  form1  method  post  action   lt  php username     gt   gt    lt p gt     lt label gt      lt input type  text  name  textfield  id  textfield  gt     lt  label gt    lt  p gt    lt p gt     lt label gt      lt input type  submit  name  button  id  button  value  Submit  gt     lt  label gt    lt  p gt   lt  form gt      gt

User · Answer

I m not sure I understand what you are trying to achieve as we don t have what username   is supposed to return but you might want to try something like that  I would also recommend you don t echo whole page and rather use something like that  it s much easier to read and maintain    lt  php require once    username php     if  isset   POST        textfield     POST  textfield       this will get you what was in the                                        textfield if the form was submitted     gt    lt form name  form1  method  post  action   lt  php echo   SERVER  PHP SELF       gt     lt p gt Your username is   lt  php echo username      gt  lt  p gt     lt p gt       lt label gt         lt input type  text  name  textfield  id  textfield  gt       lt  label gt     lt  p gt     lt p gt       lt label gt         lt input type  submit  name  button  id  button  value  Submit  gt       lt  label gt     lt  p gt   lt  form gt    This will post the results in the same page  So first time you display the page  only the empty form is shown  if you press on submit  the textfield field will be in the  textfield variable and you can display it again as you want   I don t know if the username   function was supposed to return you the URL of where you should send the results but that s what you d want in the action attribute of your form  I ve put the result down in a sample paragraph so you see how you can display the result  See the  Your username is     part        Edit   If you want to send the value without leaving the page  you want to use AJAX  Do a search on jQuery on StackOverflow or on Google   You would probably want to have your function return the username instead of echo it though  But if you absolutely want to echo it from the function  just call it like that  lt  php username     gt  in your HTML form   I think you will need to understand the flow of the client-server process of your pages before going further  Let s say that the sample code above is called form php    Your form php is called  The form php generates the HTML and is sent to the client s browser  The client only sees the resulting HTML form  When the user presses the button  you have two choices  a  let the browser do its usual thing so send the values in the form fields to the page specified in action  in this case  the URL is defined by PHP SELF which is the current page php   Or b  use javascript to push this data to a page without refreshing the page  this is commonly called AJAX  A page  in your case  it could be changed to username php  will then verify against the database if the username exists and then you want to regenerate HTML that contains the values you need  back to step 1

User · Answer

In PHP functions will not be evaluated inside strings  because there are different rules for variables    lt  php function name       return  Mark      echo  My name is  name          Output  My name is name   echo  My name is     name       Output  My name is Mark   The action parameter to the  tag in HTML should not reference the PHP function you want to run  Action should refer to a page on the web server that will process the form input and return new HTML to the user  This can be the same location as the PHP script that outputs the form  or some people prefer to make a separate PHP file to handle actions   The basic process is the same either way    Generate HTML form to the user  User fills in the form  clicks submit  The form data is sent to the locations defined by action on the server  The script validates the data and does something with it  Usually a new HTML page is returned    A simple example would be    lt  php      POST is a magic PHP variable that will always contain    any form data that was posted to this page     We check here to see if the textfield called  name  had    some data entered into it  if so we process it  if not we    output the form  if  isset   POST  name         print name   POST  name       else     print form          In this function we print the name the user provided  function print name  name          name should be validated and checked here depending on use       In this case we just HTML escape it so nothing nasty should      be able to get through    echo  Your name is     htmlentities  name         This function is called when no name was sent to us over HTTP  function print form       echo        lt form name  form1  method  post  action    gt       lt p gt  lt label gt  lt input type  text  name  name  id  textfield  gt  lt  label gt  lt  p gt       lt p gt  lt label gt  lt input type  submit  name  button  id  button  value  Submit  gt  lt  label gt  lt  p gt       lt  form gt           gt    For future information I recommend reading the PHP tutorials  http   php net tut php  There is even a section about Dealing with forms

User · Answer

Is it really a function call on the action attribute  or it should be on the onSUbmit attribute  because by convention action attribute needs a page URL   I think you should use AJAX with that   There are plenty PHP AJAX Frameworks to choose from  http   www phplivex com example submitting-html-forms-with-ajax  http   www xajax-project org en docs-tutorials learn-xajax-in-10-minutes   ETC   Or the classic way   http   www w3schools com php php ajax php asp  I hope these links help

User · Answer

lt  php require once    username php      if  isset   POST  textfield           echo username        return     echo    lt form name  form1  method  post  action    gt     lt p gt       lt label gt         lt input type  text  name  textfield  id  textfield  gt       lt  label gt     lt  p gt     lt p gt       lt label gt         lt input type  submit  name  button  id  button  value  Submit  gt       lt  label gt     lt  p gt   lt  form gt      gt    You need to run the function in the page the form is sent to

User · Answer

You can put the username   function in another page  and send the form to that page

User · Answer

It s better something like this   post the data to the self page and maybe do a check on user input       lt  php     require once    username php          if isset   POST           echo  form post      ex   POST  textfield               echo        lt form name  form1  method  post  action        SERVER  PHP SELF        gt         lt p gt           lt label gt             lt input type  text  name  textfield  id  textfield  gt           lt  label gt         lt  p gt         lt p gt           lt label gt             lt input type  submit  name  button  id  button  value  Submit  gt           lt  label gt         lt  p gt       lt  form gt          gt

[php] How can I execute a PHP function in a form action?

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