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Recursive Database Delete


I have two tables in my database, one for the folders, where each folder has a parent id and an id itself, and one for the files where each file has a parent id for the folder its in. Now If the user deletes a folder, every file and folder within it, no matter how many there are, should be deleted. Can anyone give me the idea?




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A seemingly simple problem with(out) a seemingly impossible solution. PHP Code:

function subfolders($folderIn = '', $levelIn = 0) {
    $folderName = $folderIn;
    $folderIn .= ($folderIn!='') ? '/' : ''
    $levelOut = $levelIn+1;
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    foreach($tmp as $key=>$value) {
        $dir[] = end(explode('/', $value));
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        $str = ''
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        echo $str.$dir[$key]."
";
        echo $str.'<font color="red">  subfolders('.$dir[$key].', '.$levelOut.')</font>'."
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Support Recursive
I assume the answer is yes. I try to write readSubdir function read all files in all sub-directories.

<?php
readSubdir("Documents/2005");

function readSubdir($dirPath) {
$dirPointer = opendir($dirPath);
while (($file = readdir($dirPointer)) != false) {
if ($file == "." || $file == "..")
continue;
if (filetype($file) == "dir") {
# if (is_dir($file) == true) {
# if (strcmp(filetype($file), "dir") == 0) {
readSubdir($file);
} else {
string(3) "dir"
..

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Can't Get Head Around Recursive Function.
My question relates to a directory site I'm working on.

I have an ID for a category. This is likely the child of child of a child, etc. category. For example - Holiday: Travel: Plains

Given that the ID for plains is, say 10, I want to build the above with navigation, ie. looking like:

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Possible Bug With Recursive Array References
I am using PHP 5.0.4 with Apache 2, on WinXP Pro. This behavior
appears to be fundamental however, and should not be affected by
platform.

It would seem that there is some kind of bug in the process that
creates the reference when it is being assigned to an array element
within itself. If it is already referenced, it just assigns the
existing reference and avoids the problem.

As I was reading the documentation about references, I noticed the
warning about "complex arrays". Here is what it says:

----- begin PHP docs -----
Complex arrays are sometimes rather copied than referenced. Thus
following example will not work as expected. Example 21-3. References
with complex arrays

<?php
$top = array(
'A' => array(),
'B' => array(
'B_b' => array(),
),
);

$top['A']['parent'] = &$top;
$top['B']['parent'] = &$top;
$top['B']['B_b']['data'] = 'test'
print_r($top['A']['parent']['B']['B_b']); // array()
?>
----- end PHP docs -----

So I decided to play around with this, and sure enough I got the same
results. But after making a few changes, I discovered that the
behavior is caused by recursively assigning the reference, and not due
to the array structure itself. Consider this example code:

<?php
$top = array( 'X' => 1, 'Y' => 1, 'Z' => 0 );
$top['Y'] = &$top;
$top['X'] = &$top;
$top['Z'] = 4;

echo "X = ", var_dump( $top['X']['Z'] );
echo "Y = ", var_dump( $top['Y']['Z'] );
echo "Z = ", var_dump( $top['Z'] );
?>

The results show:

X = int(0)
Y = int(4)
Z = int(4)

The result for X still has the original value. This would seem to
agree with the orginal statement in the PHP docs. But, if you reverse
the order of the reference assignments like this:

$top['Y'] = &$top;
$top['X'] = &$top;
$top['Z'] = 4;

Then, the result for Y has the original value.

X = int(4)
Y = int(0)
Z = int(4)

Furthermore, if you assign some arbitrary variable a reference to $top
before doing anything else...

$z = &$top;

The output appears to be "correct" now:

X = int(4)
Y = int(4)
Z = int(4)

Looking at the var_dump of the actual resulting array struct reveals
that where the reference is being assigned matches the contents of the
array at *that point in time* up until the next recursive reference
assignment. At that point $top branched off, leaving the first one
pointing to the previous instance. So it would appear that it is
actually a fractal array structure :) Each member that gets another
ref to $top adds another fractal generation to the var_dump.

But nonetheless, assigning a reference to a separate variable stops the
branching for all subsequent recursive reference assignments. So it
appears that assigning a reference to an element within itself like
that does not correctly create the reference, unless the reference was
already created.

Another way to demonstrate this is to compare the output of these two
scripts:

<?php
$top = array( 'W' => 1, 'X' => 1, 'Y' => 1, 'Z' => 0 );
$top['WW'] = 'wwwww' $top['W'] = &$top; unset ( $top['WW'] );
$top['XX'] = 'xxxxx' $top['X'] = &$top; unset ( $top['XX'] );
$top['YY'] = 'yyyyy' $top['Y'] = &$top; unset ( $top['YY'] );
$top['Z'] = 4;
var_dump( $top );
?>

<?php
$top_t = array( 'W' => 1, 'X' => 1, 'Y' => 1, 'Z' => 0 );
$top_t['WW'] = 'wwwww' $top_w = $top_t; $top_w['W'] = &$top_w; unset (
$top_w['WW'] );
$top_w['XX'] = 'xxxxx' $top_x = $top_w; $top_x['X'] = &$top_x; unset (
$top_x['XX'] );
$top_x['YY'] = 'yyyyy' $top_y = $top_x; $top_y['Y'] = &$top_y; unset (
$top_y['YY'] );
var_dump( $top_y );
?>

Basically, the output is the same, except that in the first one, the
dump of $top['Y']['Y'] is shorted to "*RECURSION*" but not in the
second.

Now compare the output of these two scripts:

<?php
for ( $i = 0; $i < 10; $i ++ ) $top[$i] = &$top;
$top['A'] = 'AAAAA' var_dump( $top );
?>

<?php
$z = &$top;
for ( $i = 0; $i < 10; $i ++ ) $top[$i] = &$top;
$top['A'] = 'AAAAA' var_dump( $top );
?>

The only difference is the reference assignment at the beginning of the
second one. But the results differ vastly. The first outputs over
157457 lines, while the second only outputs about 2554 lines.

What I would like to know, is if this is actually a bug, or if this
behavior is intentional. I do not have much knowledge of how the Zend
Engine creates the references. But I find it at least somewhat
dangerous that it can have that "fractal" effect so easily. And since
it can be avoided by simply setting a reference to a separate variable,
I am convinced that something is broken (or at least VERY confusing).

The design of the language does not seem to justify this statement:

"make a direct reference assignment to the array before adding
recursive references inside it, or else the structure will branch with
each assignment"

So... any thoughts?

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I'm trying to put together a file download system with categories / subcategories. I made the following 3 tables: Code:

FILES
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FILE_DESC VARCHAR2
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-------------------------------------------
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FILE_CATEGORIES_REL
-------------------------------------------
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I am using Oracle, so no worries about the non mysql data types.
So I have been looking at freeware code for about 2 days and I can't understand how to create a function that recursively displays my categories. Ideally I am trying to output a table Such that when I click on a category, it displays sub categories and files within it.

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Recursive Function Problems
I have got a number of functions that query my database and displays a particular catagory passed in the url. The functions display any sub category that category may have as well as well as teaser text. All of this is displayed dymanically in row of 3 column table layout. This is queried using a simple MySQL wrapper... and the query function in the wrapper uses mysql_connect()

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Hello,

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return $child;

}

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I've got a function that reads all files and folders in a directory given directory. I would like this to be recursive, so when it encounters a folder, it runs the function over again with the new folder (directory). Problem is, I didn't write this function, so I'm not exactly sure how to accomplish this. Code:

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Allinone/Recursive Script
I'm trying to create a combined login/database input script that has an if conditional where if the login details have been entered it present the database input screen and if they are not entered it presents the login screen.

Now I've got it to work, it runs, but both forms are being displayed, and it seems to be ignoring the if conditional (obviously when the page first loads nothing's been entered). Code:

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Recursive MySQL Query?
I'm try to create an unordered list of parent/child relationships in my DB. My DB table is setup like this.

members
-member_id
-fname
-lname
-parrent_id

So I want to query this table and output an unordered list like this: Code:

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Copy Recursive Directories
I need to be able to do a recursive copy of a directory on a staging server (virtual) to a the production server (another virtual on the same machine.) I've been tring the examples at http://www.php.net/copy, after much tweaking, I still can not get this to work.

I get no errors anywhere and when I check the paths they are correct. The permissions are correct as well. Code:

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