I have really no idea what's happening. The story:
I use PDO for a SELECT statement on a database.
$sql = "SELECT a,b,c,performance,points,compare
FROM normvalues
WHERE x=:x AND y=1 AND z=:z";
$stmt = $GLOBALS['PDO']->prepare($sql);
$stmt->bindParam(":x",$x);
$stmt->bindParam(":z",$z);
$stmt->execute();
$res=$stmt->fetchAll(PDO::FETCH_ASSOC);
So that's fine and it is working. When I var_dump the $res variable I get something like:
array(6) {
["a"]=> string(2) "44"
["b"]=> string(4) "1176"
["c"]=> string(4) "1166"
["performance"]=> string(4) "50.1"
["points"]=> string(1) "1"
["compare"]=> string(2) "-1"
}
[1]=>
array(6) {
["a"]=> string(2) "57"
["b"]=> string(4) "1176"
["c"]=> string(4) "1166"
["performance"]=> string(4) "47.7"
["points"]=> string(1) "2"
["compare"]=> string(2) "-1"
}
[2]=>
array(6) {
["a"]=> string(2) "70"
["b"]=> string(4) "1176"
["c"]=> string(4) "1166"
["performance"]=> string(4) "44.7"
["points"]=> string(1) "3"
["compare"]=> string(2) "-1"
}
...
That's also okay. But I have to sort the result another way. So I am doing:
foreach($res as $e){
$this->normTable[$e['a']][$e['points']]=$e['performance'];
$this->normTable[$e['a']]['compare']=$e['compare'];
}
And now I am completely lost. By assigning $e['performance'] I get wrong values. Actually this should be the performance values.
[1176]=>
array(4) {
[1]=> string(2) "50"
["compare"]=> string(2) "-1"
[2]=> string(2) "48"
[3]=> string(2) "45"
}
I already checked the values in the database and they are correct. By doing doubleval() I'd get the right values, but the problem is that not every value is a double but also integer or string. I also tried to typecast with (string) but it's the same result. I have no explanation.
Update:
It's a very big project and I just tried to minimize it as possible and to make my problem as clear as possible. But now I have figured out something new:
I do an 'echo()' of my first variable in the normTable during the loop:
foreach($res as $e){
$this->normTable[$e['a']][$e['points']]=$e['performance'];
echo "a:".$e['a']." pt: ".$e['points']." perf: ".$e['performance']."-".$this->normTable[1176][1]."\n";
$this->normTable[$e['a']]['compare']=$e['compare'];
}
and the value is changing from '50.1' to '50'. Still can't figure out the reason. Is there a size limitaion of arrays in PHP?
UPDATE 2 and a big SORRY!
As I said, it is a big project. So the table I read out, has some values for some attributes twice or more. Actually such a case should not happen. That's why the answer is simple: It became 50 because 50 was assigned. I'm so sorry for having waisted your time. But I totally excluded this case and since I am also coding in C, my first thought was: memory leak - clear case!
Thanks for your help.
Meh, I don't have 50 reputation; can't comment only answer.
If you replace a with be in your loop, you should get your expected result (given your data sample). I.e.:
foreach($res as $e){
$this->normTable[$e['b']][$e['points']]=$e['performance'];
$this->normTable[$e['b']]['compare']=$e['compare'];
}
But I'm not sure this really solves your problem. YMMV.
Hi i'm using Laravel 5 and i have an array with 5 element
array(5) { [0]=> string(25) "Ruby on rails" [1]=> string(14)
"Web Develop" [2]=> string(12) "Asp.net" [3]=> string(3) "Php" [4]=>
string(4) "Java" }
And i use this function to create friendly url
foreach ($tag as $value)
{
$href = str_slug($value, "-");
}
And i get this
string(18) "Ruby-on-rails" string(10) "Web-Develop" string(9)
"asp-net" string(3) "php" string(4) "java"
So how i can foreach those string i get and pass into view to make friendly url.Thanks for help
If I understand it the right way, you are trying to merge all your tags together to one URL. The problem is, that you create a slug for each single tag and not for all tags.
The output you gave us seems to be an array, so you could use the php function implode to stick them all together. For example:
$slug = implode('-', $yourArrayWithSingleSlugs )
This would put a - between each single slug in your array and combine them to a string.
I have written an xml-parser to read an XML-file. The XML-file is not mine so I can't change the structure. Things work great till I got to this special point. I want to read a value but I don't have a key to access this value.
I marked the values (in red) in the screenshot below which I want to access.
When I dump the parent element (the PRAT->VALUE) I get this in return:
object(SimpleXMLElement)#31 (3) { ["#attributes"]=> array(5) { ["nr"]=> string(1) "1" ["unit"]=> string(3) "bar" ["unit_id"]=> string(4) "3103" ["vo"]=> string(0) "" ["vo_id"]=> string(0) "" } [0]=> string(2) "20" [1]=> string(1) "2" }
As seen, at the end of the dump the values that I want to access are presented. I tried to access it like an array but that doesn't work. The values are not part of the attributes.
use (String) keyword in front of it.
eg.
echo (String) PRAT->VALUE;
***i am making a quiz app using php and mysql and i have to display random questions..but i have defined static indexes for the answers..my program shows random question by refreshing the window but the answers index dont refresh according to question as they are static
<?php
$con=mysql_connect('localhost','root','test123');
mysql_select_db("quiz",$con);
?>
<html>
<body>
<form method="get" action="result.php">
<?php
$query="select m_question,a,b,c,d,e from mcq ORDER BY RAND()";
$result=mysql_query($query);
$rows=mysql_num_rows($result);
$a=1;
for($j=0;$j<$rows;$j++)
{
echo "<br> $a." .mysql_result($result,$j,'m_question')."<br>" ;
echo "<input type = radio name=$a value='a'>" .mysql_result($result,$j,'a');
echo "<input type = radio name=$a value='b'>" .mysql_result($result,$j,'b');
echo "<input type = radio name=$a value='c'>" .mysql_result($result,$j,'c');
echo "<input type = radio name=$a value='d'>" .mysql_result($result,$j,'d');
echo "<input type = radio name=$a value='e'>" .mysql_result($result,$j,'e');
$a++;
}
?>
<br>
<br>
<input type = "submit" value ="submit result">
</body>
</html>
and this is my result file where i am comparing results .ans of 1 questions is "b" option and and 2nd is "a" and so on...
<?php
$result=0;
if ($_GET[1]=='b')
{$result++;}
if ($_GET[2]=='a')
{$result++;}
if ($_GET[3]=='b')
{$result++;}
if ($_GET[4]=='b')
{$result++;}
echo "your score::".$result;
?>
I'm not sure what you mean by 'Static indexes for the answers', but you should remember that your database schema should always reflect the data stored in such a way that you could answer any questions you might have just by looking at the data available. Since I don't exactly know what you have based only on your code (you don't specify your schema, for example), I'll assume we're starting from scratch - and you can compare what you have to what I come up with.
The Schema
First, you have two sets of data: Questions, and Answers. Since this is a quiz app, I'm presuming that the format of the quiz is 'Multiple Choice'; that is, each Question has two or more possible answers, and only one of them is correct.
This means that we should split the questions and the answers into two tables; lets call them 'questions' and 'answers' respectively.
Questions
In the 'questions' table, we need a few things:
A unique, numeric identifier for each question. This is needed to set up any relationships in the future, so that we can point to any particular question easily (sure the text strings in the question are probably unique already, but when you want to quickly point to a specific item in the table, computers are much faster at comparing and searching through numbers than they are at comparing and searching through text). This will be our primary key.
The question itself. This is rather obvious.
So far, our schema looks something like this (primary keys in bold):
questions
q_id
question
Note: 'q_id' (or whatever you name your primary key) should also be labeled as 'AUTO_INCREMENT'. When you enter each question into the database, you leave that field 'null', and it'll automatically assign it the next available number.
Answers
Now for the 'answers' table, we'll need some different things. We'll need to identify each answer individually (to be able to point to each one they can choose), the question the answer belongs to, and we'll also have to be able to identify which one is the correct answer.
We can do this by having, along with an 'answer id' primary key, a 'foreign key' referencing the 'q_id' column in the 'questions' table, since it's the primary key for that table and thus identifies each row (each question) uniquely. Then all we need is the answer itself, and whether or not it's the correct answer. The end result is something like this:
answers
a_id
q_id (foreign key: questions.q_id)
answer
correct (enum: 'yes', 'no')
This also allows for questions to have no right answer, or multiple right answers. You'd have to take care of your data to make sure it's in line with the quiz. If you want to restrict only one right answer per question, you can add a 'UNIQUE' index that encompasses both 'q_id' and 'correct'. In MySQL, it'd look something like:
UNIQUE INDEX (q_id, correct),
That would go inside of your CREATE TABLE statement, or into a separate ALTER TABLE statement.
Note: 'q_id' in 'answers' should not *use either AUTO_INCREMENT* or be a primary key. If you feel it is causing a bottleneck, put an index on it.
Example Data Set
To help see this schema in action, lets make a simple quiz:
questions
1, "How many inches are in a mile?";
2, "Why do people breathe air?";
3, "Why is Monty Python popular?";
answers
1, 1, "63,360", 'yes';
2, 1, "5,280", 'no';
3, 1, "Over a million", 'no';
4, 1, "Several Hundred", 'no';
5, 2, "So they don't die", 'yes';
6, 2, "Because it's cool", 'no';
7, 2, "Because it's polite", 'no';
8, 2, "So they can laugh at people who don't", 'no';
9, 3, "Because people find it funny", 'yes';
10, 3, "Because it is", 'no';
11, 3, "Because of the French", 'no';
12, 3, "It's popular?", 'no';
Querying in PHP
There are two sets of queries to worry about here: grabbing the questions, and grabbing the answers. I would like to first point out that in your code examples, you're using the old, antiquated 'mysql' set of functions ('mysql_query', 'mysql_result', and so forth).
This is HIGHLY discouraged, and you should learn to use either the newer 'Mysqli' library, or the more abstracted 'PDO' library. I will be using Mysqli.
Method 1: All at once.
The first way you could run the queries, is to select all the questions, and then all the answers at once, put them into a data structure (your own class, or just a nested array), and then randomize the order in which they're displayed. Here is some code showing this. The comments are worth reading:
<?php
//Connect to MySQL:
$con = new mysqli("localhost", "tynach", "505.2.0", "quiz");
//Grab the question list:
$get_questions = $con->prepare("SELECT q_id, question FROM questions");
$get_questions->execute();
$get_questions->bind_result($q_id, $question);
$questions = array();
while ($get_questions->fetch()) {
// We use $q_id twice because if you scramble the array, the first one
// changes. However, we still might want to keep track of the original
// question ID number.
// The reason we use it in that first spot to begin with is so that we
// know for sure that we can associate the answers to the correct
// questions.
$questions[$q_id] = array($q_id, $question, array());
}
// Grab the answer list:
$get_answers = $con->prepare("SELECT a_id, q_id, answer, correct FROM answers");
$get_answers->execute();
$get_answers->bind_result($a_id, $q_id, $answer, $correct);
while ($get_answers->fetch()) {
$questions[$q_id][2][$a_id] = array($a_id, $answer, $correct);
}
// Scramble the array, and print it out:
shuffle($questions);
var_dump($questions);
?>
The output to that is:
array(3) {
[0]=>
array(3) {
[0]=>
int(1)
[1]=>
string(30) "How many inches are in a mile?"
[2]=>
array(4) {
[1]=>
array(3) {
[0]=>
int(1)
[1]=>
string(6) "63,360"
[2]=>
string(3) "yes"
}
[2]=>
array(3) {
[0]=>
int(2)
[1]=>
string(5) "5,280"
[2]=>
string(2) "no"
}
[3]=>
array(3) {
[0]=>
int(3)
[1]=>
string(14) "Over a million"
[2]=>
string(2) "no"
}
[4]=>
array(3) {
[0]=>
int(4)
[1]=>
string(15) "Several Hundred"
[2]=>
string(2) "no"
}
}
}
[1]=>
array(3) {
[0]=>
int(2)
[1]=>
string(26) "Why do people breathe air?"
[2]=>
array(4) {
[5]=>
array(3) {
[0]=>
int(5)
[1]=>
string(17) "So they don't die"
[2]=>
string(3) "yes"
}
[6]=>
array(3) {
[0]=>
int(6)
[1]=>
string(17) "Because it's cool"
[2]=>
string(2) "no"
}
[7]=>
array(3) {
[0]=>
int(7)
[1]=>
string(19) "Because it's polite"
[2]=>
string(2) "no"
}
[8]=>
array(3) {
[0]=>
int(8)
[1]=>
string(37) "So they can laugh at people who don't"
[2]=>
string(2) "no"
}
}
}
[2]=>
array(3) {
[0]=>
int(3)
[1]=>
string(28) "Why is Monty Python popular?"
[2]=>
array(4) {
[9]=>
array(3) {
[0]=>
int(9)
[1]=>
string(28) "Because people find it funny"
[2]=>
string(3) "yes"
}
[10]=>
array(3) {
[0]=>
int(10)
[1]=>
string(13) "Because it is"
[2]=>
string(2) "no"
}
[11]=>
array(3) {
[0]=>
int(11)
[1]=>
string(21) "Because of the French"
[2]=>
string(2) "no"
}
[12]=>
array(3) {
[0]=>
int(12)
[1]=>
string(13) "It's popular?"
[2]=>
string(2) "no"
}
}
}
}
I had more to write, but I'm about to go to a Superbowl party, so I'll edit this post with more info later.
I hope I can make this question clear enough.
I'm looking to put a list of arrays inside one master array, dynamically, so that it looks like this:
masterarray {
array1
{ [0]=>VAL1 [1]=>VAL2 }
array2
{ [0]=>VAL1 [1]=>VAL2 }
array3
{ [0]=>VAL1 [1]=>VAL2 }
}
I've tried, but I could only get it to look like this:
array(1) { [0]=> array(2) { [0]=> string(1) "1" [1]=> string(13) "CODE" } }
array(2) { [0]=> array(2) { [0]=> string(1) "1" [1]=> string(13) "CODE" } [1]=> array(2) { [0]=> string(1) "1" [1]=> string(13) "CODE" } }
array(3) { [0]=> array(2) { [0]=> string(1) "1" [1]=> string(13) "CODE" } [1]=> array(2) { [0]=> string(1) "1" [1]=> string(13) "CODE" } [2]=> array(2) { [0]=> string(1) "1" [1]=> string(13) "CODE" } }
And that's definitely not what I'm aiming for. Nothing seems contained. I need the format specified above.
I'm using the explode function on a string pulled from a file to make this table of arrays (I think you call it that)
Here is the code I'm using that's not working.
$variabledebugging = file("FILE.TXT");//LOOK IN THIS FILE FOR THE NUMBER AND SET IT TO A VAR.
$i=0;
foreach($variabledebugging as $placeholder){
$variabledebuggingtbl[] = explode("\t",$variabledebugging[$i]);
var_dump($variabledebuggingtbl);
$i++;
}
I've tried a couple of different variations, but that's the one I'm using now.
To be clear, that file being pulled (each line as a value in an array) has 2 things written to each line, separated by a tab character, so that's the system I'm going on.
Thank you! I'm sure this is a simple task, I just can't think it through.
Oh and while I'm at is there a way to make debugging more readable?
You ARE getting the right result. The reason it seems wrong is that you are running var_dump inside the loop. And why don't you use the $placeholder variable?
$variabledebugging = file("FILE.TXT");
foreach($variabledebugging as $placeholder){
$variabledebuggingtbl[] = explode("\t", $placeholder);
}
var_dump($variabledebuggingtbl);
I'm not sure what you mean by "making debugging more readable", but if you want some linebreaks and indentation you should just look in the generated HTML code. var_dump do add spacing to make it readable but it is ignored by the web browser. If you don't want to read the HTML source, just add your var_dump to a <pre> element.