I'm having a small problem. In a class called reservation that has an attribute called reserve , which in the database is a tinyint(4), and an attribute kamp, which is int(10). I'm trying to do this:
if ($this->kamp == 387 || $this->kamp == 388 || $this->kamp == 389) {
$this->reserve = 0;
} else {
$this->reserve = 1;
}
Now my problem is, the code ALWAYS jumps straight to the else bracket. Even when I'm 100% sure $this->kamp is 387, 388 or 389.
Does this have anything to do with datatypes or am I missing something? I think the problem lies within this piece of code, since in my database there are objects showing up where reserve = 1 and the kamp is one of the three numbers I mentioned.
Thanks!
i think this will work for you.
$val = intval($this->kamp);
and then print or echo for result it will giving you value or not ?
let me know if i can help you more.
Related
I have the following SQLite table
CREATE TABLE keywords
(
id INTEGER PRIMARY KEY,
lang INTEGER NOT NULL,
kwd TEXT NOT NULL,
count INTEGER NOT NULL DEFAULT 0,
locs TEXT NOT NULL DEFAULT '{}'
);
CREATE UNIQUE INDEX kwd ON keywords(lang,kwd);
Working in PHP I typically need to insert keywords in this table, or update the row count if the keyword already exists. Take an example
$langs = array(0,1,2,3,4,5);
$kwds = array('noel,canard,foie gras','','','','','');
I now these data run through the following code
$len = count($langs);
$klen = count($kwds);
$klen = ($klen < $len)?$klen:$len;
$sqlite = new SQLite3('/path/to/keywords.sqlite');
$iStmt = $sqlite->prepare("INSERT OR IGNORE INTO keywords (lang,kwd)
VALUES(:lang,:kwd)");
$sStmt = $sqlite->prepare("SELECT rowid FROM keywords WHERE lang = :lang
AND kwd = :kwd");
if (!$iStmt || !$sStmt) return;
for($i=0;$i < $klen;$i++)
{
$keywords = $kwds[$i];
if (0 === strlen($keywords)) continue;
$lang = intval($langs[$i]);
$keywords = explode(',',$keywords);
for($j=0;$j < count($keywords);$j++)
{
$keyword = $keywords[$j];
if (0 === strlen($keyword)) continue;
$iStmt->bindValue(':kwd',$keyword,SQLITE3_TEXT);
$iStmt->bindValue(':lang',$lang,SQLITE3_INTEGER);
$sStmt->bindValue(':lang',$lang,SQLITE3_INTEGER);
$sStmt->bindValue(':kwd',$keyword,SQLITE3_TEXT);
trigger_error($keyword);
$iStmt->execute();
$sqlite->exec("UPDATE keywords SET count = count + 1 WHERE lang =
'{$lang}' AND kwd = '{$keyword}';");
$rslt = $sStmt->execute();
trigger_error($sqlite->lastErrorMsg());
trigger_error(json_encode($rslt->fetchArray()));
}
}
which generates the following trigger_error output
Keyword: noel
Last error: not an error
SELECT Result: {"0":1,"id":1}
Keyword: canard
Last Error: not an error
SELECT Reult:false
Keyword:foiegras
Last Error: not an error
SELECT Result: false
From the SQLite command line I see that the three row entries are present and correct in the table with the id/rowid columns set to 1, 2 and 3 respectively. lastErrorMsg does not report an error and yet two of the three $rslt->fetchArray() statements are returning false as opposed to an array with rowid/id attributes. So what am I doing wrong here?
I investigated this a bit more and found the underlying case. In my original code the result from the first SQLite3::execute - $iStmt-execute() - was not being assigned to anything. I did not see any particular reason for fetching and interpreting that result. When I changed that line of code to read $rslt = $iStmt->execute() I got the expected result - the rowid/id of the three rows that get inserted was correctly reported.
It is as though internally the PHP SQLite3 extension buffers the result from SQLiteStatement::execute function calls. When I was skipping the assignment my next effort at running such a statement, $sStmt->execute() was in effect fetching the previous result. This is my interpretation without knowing the inner workings of the PHP SQLite3 extension. Perhaps someone who understands the extension better would like to comment.
Add $rslt = NONE; right after trigger_error(json_encode($rslt->fetchArray())); and the correct results appear.
FetchArray can only be called once and somehow php is not detecting that the variable has changed. I also played with changing bindValue to bindParam and moving that before the loop but that is unrelated to the main issue.
It is my opinion that my solution should not work unless there is a bug in php. I am too new at the language to feel confident in that opinion and would like help verifying it. Okay, not a bug, but a violation of the least surprise principle. The object still exists in memory so without finalizing it or resetting the variable, fetch array isn't triggering.
I am facing a really strange problem which i am debugging from past 2 hours but unable to find the solution. Before explaining the problem, let me show the code
My Controller Function is
$this->load->library('datatables');
$actionLinkBar = $this->load->view("content/updates/dt_files/action_bar", array(), TRUE);
$this->datatables
->select("id, name, status")
->where('id', $this->session_data['user_id'])
->from("t_user")
->add_column("action", $actionLinkBar, 'id, name, status');
echo $this->datatables->generate();
And the code in my action_bar view is
<?php
$status_rec = '$3';
var_dump($status_rec); // STRANGE OUTPUT - string(2) "1"
?>
<div class="action_bar" data-update-id="<?php echo '$1'; ?>">
<?php if ($status_rec == '1') { ?> // HENCE COMPARISON ALWAYS FAILS
<span>Present</span>
<?php }else { ?>
<span>Absent</span>
<?php } ?>
</div>
Now explaining the problem.. I am using Datatables with Codeigniter. I have a view template action_bar which will be displayed in one of the columns of datable in front end. The view has if/else condition based on value of status field from DB. If status feild value = 1 = Present. Else it is Absent. But though the $status_rec has value as '1' it still fails in comparison. Strange thing is on var_dumping $status_rec, i found that though it has proper value, the length is weird(2) though its single int. I even tried trimming etc but still no effect. Maybe that's why the comparison is failing. Your help is really needed :/
P.S - The DB feild that holds this value is int with length 1
I also had a similar problem solved it a bit by changing the library:
Datatables.php with if condition
changes in the 194, 196 and 440 strings
How to use:
$if = array('0' => array('if_condition'=>'$3', 'if_condition_eqv'=>'1', 'if_true'=>'<span>Present</span></div>', 'if_false'=>'<span>Absent</span></div>'));
$this->datatables->add_column("action", '<div class="action_bar" data-update-id="$1">', 'id, name, status');
BUT you have to change: ".=" On "=" (strings 497 and 504)
Should work.
I would really appreciate if someone will correct code
P.S. Sorry for my english
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I saw on StackOverflow a "point in polygon" raytracing algorithm that I implemented in my PHP Code. Most of the time, it works well, but in some complicated cases, with complex polygons and vicious points, it fails and it says that point in not in polygon when it is.
For example:
You will find here my Polygon and Point classes: pointInPolygon method is in Polygon class. At the end of the file, there are two points that are supposed to lie inside the given polygon (True on Google Earth). The second one works well, but the first one is buggy :( .
You can easily check the polygon on Google Earth using this KML file.
Have been there :-) I also travelled through Stackoverflow's PiP-suggestions, including your reference and this thread. Unfortunately, none of the suggestions (at least those I tried) were flawless and sufficient for a real-life scenario: like users plotting complex polygons on a Google map in freehand, "vicious" right vs left issues, negative numbers and so on.
The PiP-algorithm must work in all cases, even if the polygon consists of hundreds of thousands of points (like a county-border, nature park and so on) - no matter how "crazy" the polygon is.
So I ended up building a new algorithm, based on some source from an astronomy-app:
//Point class, storage of lat/long-pairs
class Point {
public $lat;
public $long;
function Point($lat, $long) {
$this->lat = $lat;
$this->long = $long;
}
}
//the Point in Polygon function
function pointInPolygon($p, $polygon) {
//if you operates with (hundred)thousands of points
set_time_limit(60);
$c = 0;
$p1 = $polygon[0];
$n = count($polygon);
for ($i=1; $i<=$n; $i++) {
$p2 = $polygon[$i % $n];
if ($p->long > min($p1->long, $p2->long)
&& $p->long <= max($p1->long, $p2->long)
&& $p->lat <= max($p1->lat, $p2->lat)
&& $p1->long != $p2->long) {
$xinters = ($p->long - $p1->long) * ($p2->lat - $p1->lat) / ($p2->long - $p1->long) + $p1->lat;
if ($p1->lat == $p2->lat || $p->lat <= $xinters) {
$c++;
}
}
$p1 = $p2;
}
// if the number of edges we passed through is even, then it's not in the poly.
return $c%2!=0;
}
Illustrative test :
$polygon = array(
new Point(1,1),
new Point(1,4),
new Point(4,4),
new Point(4,1)
);
function test($lat, $long) {
global $polygon;
$ll=$lat.','.$long;
echo (pointInPolygon(new Point($lat,$long), $polygon)) ? $ll .' is inside polygon<br>' : $ll.' is outside<br>';
}
test(2, 2);
test(1, 1);
test(1.5333, 2.3434);
test(400, -100);
test(1.01, 1.01);
Outputs :
2,2 is inside polygon
1,1 is outside
1.5333,2.3434 is inside polygon
400,-100 is outside
1.01,1.01 is inside polygon
It is now more than a year since I switched to the above algorithm on several sites. Unlike the "SO-algorithms" there have not been any complaints so far. See it in action here (national mycological database, sorry for the Danish). You can plot a polygon, or select a "kommune" (a county) - ultimately compare a polygon with thousands of points to thousands of records).
Update
Note, this algorithm is targeting geodata / lat,lngs which can be very precise (n'th decimal), therefore considering "in polygon" as inside polygon - not on border of polygon. 1,1 is considered outside, since it is on the border. 1.0000000001,1.01 is not.
Hope you can help I have a simple query updating positions x and y based various user id etc. But I have a problem when I pass the variable to be updated (through ajax) to PHP, I get the variable fine but on placing it in a query a number 1 is added to the query end making the last id unusable (see example id 68 becomes 681).
Never seen this before, I am relatively new to sql tho, hope someone can shed some light on this?
$xupdate = $_POST['xupdate'];
$yupdate = $_POST['yupdate'];
$stickytext_id = $_POST['stickytextid'];
$user_id= $_POST['uid'];
$proj_id=$_POST['projid'];
echo $xupdate; //output 358
echo'<br>';
echo $yupdate; //output 203
echo'<br>';
echo $stickytext_id; //output 68
echo'<br>';
echo $proj_id; //output 7
echo'<br>';
$sql_update_stickyxy="UPDATE textsticky SET textsticky_x = $xupdate AND textsticky_y = $yupdate
WHERE textsticky_id = $stickytext_id";
echo $sql_update_stickyxy; //outputs UPDATE textsticky SET textsticky_x = 358 WHERE textsticky_id = 681 not 68?
Looking at your echo'd output you obviously embezzled some of your code. As a first debugging measure you might use $_POST['stickytextid'] instead of $stickytext_id inside your query and see where it gets you.
i have to value
$mo=strtotime($input_array['MondayOpen']);
$mc=strtotime($input_array['MondayClose']);
now i need a if condition to display an error on below conditions
if one of them($mo or $mc) are empty, null or blank.
if close time($mc) is less than open time($mo)
means if both are empty(null) or $mc>$mo then go further
please suggest optimized one line if condition for this
i know it seems very basic question, but i m facing problem when both are null
either i was using simple
if(($mo==NULL && $mc!=NULL) || ( $mo>=$mc && ($mo!=NULL && $mc!=NULL)) )
Keep in mind that 0, null, and blank all mean completely different things here. As indicated previously, strtotime will never return NULL. However, 0 is a valid unix timestamp, whereas false means that the strtotime function was unable to process the value provided.
Also, you've requested that a single-line solution; however, in my opinion, it is much better in this case to write out each condition and display a different error message for each condition. That way, the user knows what actually went wrong. Perhaps this is a better way:
// Only check for errors if we have at least one value set
if (!empty($input['MondayOpen']) || !empty($input['MondayClosed']) {
$mo = strtotime($input['MondayOpen']);
$mc = strtotime($input['MondayClosed']);
$invalid = false;
if (false === $mo) {
echo "Invalid Opening Time\n";
$invalid = true;
}
if (false === $mc) {
echo "Invalid Closing Time\n";
$invalid = true;
}
if (!$invalid && $mc <= $mo) {
echo "Closing time must be After Opening Time\n";
$invalid = true;
}
if ($invalid) {
exit(); // Or handle errors more gracefully
}
}
// Do something useful
All right. How about this.
It checks whether $mo and $mc are valid dates using is_numeric. Any NULL or false values will be caught by that.
I haven't tested it but it should work.
I spread it into a huge block of code. In the beginning, when learning the language, this is the best way to make sense out of the code. It is not the most elegant, nor by far the shortest solution. Later, you can shorten it by removing whitespace, or by introducing or and stuff.
I'm not 100% sure about the number comparison part, and I don't have the time to check it right now. You'll have to try out whether it works.
You need to decide how you want to handle errors and insert the code to where my comments are. A simple echo might already do.
// If $mo or $mc are false, show error.
// Else, proceed to checking whether $mo is larger
// than $mc.
if ((!is_numeric($mo)) and (is_numeric($mc)))
{
// Error: $mo is either NULL, or false, or something else, but not a number.
// While $mc IS a number.
}
elseif ((!is_numeric($mc)) and (is_numeric($mo)))
{
// Error: $mc is either NULL, or false, or something else, but not a number.
// While $mo IS a number.
}
else
{
if (($mc <= $mo) and ((is_numeric($mc) or (is_numeric($mo)))))
{
// Error: closing time is before opening time.
}
else
{
// Success!!
}
}
in php, strotime will return a integer or false. Checking for null in this case will never bear fruit, but otherwise...
if((!$mo xor !$mc) || ($mc && $mc<=$mo)){
print('error');
}else{
print('no_error');
}
oops, edited for correctness. I transposed $mc and $mo. XOR should be correct though.
You can try:
print ((empty($mo) && empty($mc)) || ($mc > $mo)) ? 'case_true_message' : 'case_false_message';
But you should also check the manual :) - for basic control structures