Hello,
I want help for recursive in php which like structure is attachment file..
[1] Sire (Parent)
> Sub1
->nChild..
> Sub2
[2] Dam (Parent)
> Sub1
->nChild..
> Sub2
->nChild..
Do you have some example of code so its better for me.
Thank You.
Huh? What does your recursive function do? What are inputs and what output you want? Or you simply want a search for something? The word recursive is very broad.
@Taywin:Given In Details.
[1]I have One dropdown box there have number of Goat Names.
[2]When select it then it geneted his Sir and Dam Names.
[3] If Sir and Dame have his N-childs then its also Display Names.
Names records come from database simple.
OK, so the input is a name used in query to get from database. You must always define base cases for a recursive function, or it will run forever! A very simple idea for the function (Depth-First-Search) is as follows...
function a_recursive_function(name)
data = get_data_from_database(name)
if data not exist // base case
done!
end if
display data(SireName)
a_recursive_function(data(SireName)
display data(DamName)
a_recursive_function(data(DamName)
end function
We always try to prevent ourselves from sinking into recursive function in PHP. However, if that is what you need, please consider the simple function I wrote to demonstrate how recursion works.
Recursion in PHP is a function or method that calls itself within itself.
Huh!???? I know my definition is a little blurry. For a moment allow me to provide a generic example without logic.
function genericFunction()
{
return genericFunction();
}
We can make our simple non-logical function above as template.
Let say we have a paren array as shown below,
$parent = array(
'a'=>(array('a_one' => 'a_one value','a_two'=>'a_two value', 'a_three' => 'a_three value')),
'b'=>(array('b_one' => 'b_one value','b_two'=>'b_two value', 'b_three' => 'b_three value'))
);
and we want a function that will give us the $parent['a'] and $parent['b'] recursively.
Array ( [a_one] => a_one value [a_two] => a_two value [a_three] => a_three value )
Array ( [b_one] => b_one value [b_two] => b_two value [b_three] => b_three value )
we can simply write a function that can do or provide us an output like the above.
the function::
function find_child_in_parent($child,$parent = array())
{
if(is_array($parent)){
foreach($parent as $p_key => $p_value){
if($p_key == $child){
return ( $p_value );
} // endif
} //endforeach
if(is_array($p_value)){
//recursion here
$recursion_res = find_child_in_parent($child,$p_value);
return($recursion_res ? $recursion_res : FALSE);
}
return FALSE;
}
}
we call the function like this
$parent = array(
'a'=>(array('a_one' => 'a_one value','a_two'=>'a_two value', 'a_three' => 'a_three value')),
'b'=>(array('b_one' => 'b_one value','b_two'=>'b_two value', 'b_three' => 'b_three value'))
);
print_r(find_child_in_parent('a',$parent));
echo '<br/>';
print_r(find_child_in_parent('b',$parent));
the result will be the same as I expected it shown in the earlier paragraph.
Good luck to you. please feel free to experiment. Don't be afraid in making mistakes. :)...
@Taywin: as you guide me here i have worked but its going infinite.
function generate_tree($sire)
{
global $wpdb;
$sql = $wpdb->prepare("SELECT * FROM mm_goats WHERE goat_name = %s", $sire);
$rowsire = $wpdb->get_row($sql, ARRAY_A);
if(empty($rowsire))
{
echo "done";
}
echo $rowsire['sire']; //this porsion come infinite as output
generate_tree($rowsire['sire']);
echo $rowsire['dam']; //this porsion not come in output
generate_tree($rowsire['dam']);
}
You need to return (exit the function) right after line 10 inside the if statement. ;)
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