how to use if conditions for post request data in php - php

Question

I have three input boxes in html:
<input type='text' name='source' />
<input type='text' name='target' />
<input type='text' name='date' />
<input type='submit' name='submit' value='go' />
In this, i am successfully retrieved source and target data from mysql but if date is not supplied then i have to retrieve last 7 days data from database. I can try this, and created a function for select query but use seven variables and structured them in table form. Problem is i can't design a suitable logic for all of this like,
retrieve seven days data of source if date is not suppplied retrieve
seven days data of target if date is not suppplied
I can try this using if and elseif condition like:
if (isset($_POST['source']) && empty($_POST['target'] && empty($_POST['date'] ) {
//fired query function seven times with different dates through pass a query
$init->get_result( $_POST['source'], date('Y-m-d') );
}
function for select_query:
function get_result() {
$query = "select count(*) from tablename where column=$_POST['source']";
$this->select_query($query); //from there select query function called
}
function select_query($post, $date) {
$res = $mysqli->query($query);
$row->$res->fetch_row();
return $row[0];
}
And if date is supplied then data is retrieved for specific date, all this done well but not logic well. Also i am using form action as php_self to get an result on same page, but when i am using result in variable and show in html table then i have to given a condition that after specify post data result is show, which is not done. This is so lengthy, but problem is very critical for me. Please have a look on this.
Update: I get values from database in php in this code:
if ( !empty( $_POST['source'] ) && empty( $_POST['target'] ) && empty( $_POST['date'] ) ) {
echo '<table border=1>';
echo '<tr>' . '<td>' ."<input type=submit name='tod' value=" . date( 'Y-m-d' )." >" . '</td>' . '<td>' . $adinit->get_req_data( $_POST['source'], date( 'Y-m-d' ) ) . '</td>' . '</tr>';
}
I am created a input button in echo statement, which shows date. I am trying to create an event on button which shows another tabular data from database. How can i do this?

Answer 1

You can use strtotime() function:
if (isset($_POST['source']) && empty($_POST['target'] && empty($_POST['date'] ) {
$time = strtotime('-7 days'); // or strtotime('-1 week') works too
//fired query function seven times with different dates through pass a query
$init->select_query( $_POST['source'], date('Y-m-d', $time) );
}
Appendix:
In order to work with time interval of one day you have to change your query to something like this:
get_req_data($source, $date) {
$dateMax = date('Y-m-d', strtotime($date) + (60 * 60 * 24)); // + 1 days
$query = "Select count(*) from tablename where time >= '$date' AND time <= '$dateMax'";
...
}
This will only work if time column is of datetime/timestamp type.