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navPage: docs
heading: ft_api_load_field
- API,/api/
- API v1.x,/api/v1
- Function Reference,/api/function_reference/
- Other Functions,/api/other_functions/
- ft_api_load_field
prev: Other Functions,/api/other_functions/
next: ft_api_display_captcha,/api/ft_api_display_captcha/
versions: FT2
categories: api
tags: developer
{% include open_section.html nav='nav_api_v1.html' selected='ft_api_load_field' nav_width=5 %}
This invaluable little function is a wrapper for ft_load_field, used in the core script. It's used for
storing and overwriting the contents of a single form field in sessions based on a sequence of priorities.
It assumes that a variable name can be found in GET, POST or SESSIONS (or all three). What this function does
is return the value stored in the most important variable (GET first, POST second, SESSIONS third), and
update sessions at the same time. This is extremely helpful in situations where you don't want to keep having
to submit the same information from page to page. The third parameter is included as a way to set a default
It takes three parameters:
<li>the field name</li>
<li>the session key used to store the value</li>
<li>the default value</li>
One common place for this is to store the current page in memory for a paginated list of data:
{% codemirror php %}
$page = ft_api_load_field("page", "session_page", 1);
{% endcodemirror %}
This does the following: the first time the page is loaded, it uses the third parameter - the default value
"1" (page 1). If the query string contains a page=X value or if the page has received a field called "page",
it overwrites the value in sessions and stores the appropriate value in $page. The nice thing is that you
don't need to keep sending the "page" value to the webpage. It will always remember the last value. This can
save you a lot of fuss and bother!
<h4>A technical note</h4>
The function information is actually stored here: $_SESSION["ft"][<b>session key</b>] - e.g. in the previous
example, it would be stored: $_SESSION["ft"]["session_page"]. So in case you need to empty it, you'll need to
directly modify that value in sessions.
{% include close_section.html %}
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