Passing extra data in $_POST vars

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I need to pass an id along with a form field e.g 

<input name="__field_name" value="1234" />

this only passes the name and value as a key => value pair. i need to keep the name (dynamically entered by the user) and value intact for later use, but i also need to pass an ID along with this var.

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how can i do this cleanly? i was thinking putting it in the name and doing a regex to seperate it e.g. 

__field_name__ID

although this seems messy…

points to consider:

  • there are allot of post variables that are generated by the CMS (wordpress) that i wont use
  • name must be retained in original format along with value
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3 comments

  1. Why not submit the data as an array?

    Instead of calling your field __field_name__id or some mess, use the facilities PHP provides: Call your input field field_name[id] and when the form is posted back to the server, PHP’s $_POST array will have a sub-array called field_name which contains the key=>value mappings you’d mentioned.

    If you have two such fields you want to tie together, use the following:

    <input type="text" name="myFields[id]" />
<input type="text" name="myFields[name]" />

    And on postback, PHP will provide you with a $_POST['myFields']['id'] and $_POST['myFields']['name'].

  3. You need to add a hidden form field which contains the Id of the first field. You can name it as field1_ID or something. 

    <input type="text" name="first_field" value="As_Entered_By_User"/>
<input type="hidden" name="first_field_id" value="id_first_field"/>

    Or if you are familiar with Javascript, You can post it using javascript with single form field putting the id as an attribute. 

    <input type="text" name="first_field" id="first_field_id" value="as_enteredBy_user"/>
<script>var id_to_post=document.form1.first_field.id;</script>

    here form1 is the name of the form containing the input box.