I have a function that shows a random banner from array:
//func.php
function rand_rek($rek_array){
$numberOfBanners = count($rek_array);
$numberOfBanners = $numberOfBanners - 1;
$randomBanner = rand(0,$numberOfBanners);
$rek = $rek_array[$randomBanner];
return $rek;
}
I have $reklamas array, that contains 3 banners:
//ads.php
$reklamas = array($rek1, $rek2, $rek3);
if $_GET["noa"] isnt true, I want to add more banners to $reklamas array:
if (!isset($_GET["noa"]))
array_push($reklamas, $rek_adc1, $rek_adc2, $rek_adc3, $rek_adc4);
And I want to display one of random banners x times:
for ($i=0;$i<$banneri;$i++) {
echo rand_rek($reklamas);
}
The problem:
These can be repeated as many times as they want array($rek1, $rek2, $rek3);,
while these array_push($reklamas, $rek_adc1, $rek_adc2, $rek_adc3, $rek_adc4); can be each showed only 1 time.
function rand_rek() is in func.php and it is being included from ads.php where is the rest of the code.
I think you're probably going about the problem all wrong, but in any case a solution could be
function rand_rek($rek_array){
$numberOfBanners = count($rek_array);
$numberOfBanners = $numberOfBanners - 1;
$randomBanner = rand(0,$numberOfBanners);
$rek = $rek_array[$randomBanner];
return [$randomBanner, $rek];
}
list($bannerNum, $banner) = rand_rek($reklamas);
if ($bannerNum < 3) {
$repeats = $x;
} else {
$repeats = 1;
}
for ($i=0;$i<$repeats;$i++) {
echo $banner;
}
Which retrieves the index of the banner and checks it before running the loop. I've also used your value $x that you mention in the text but not in your code.
Related
I'm new to php and am trying to write a loop that will flip a coin until exactly two heads have been flipped and then stop.
So far I've written a function for coin flipping:
function cointoss () {
$cointoss = mt_rand(0,1);
$headsimg = '<img src=""/>';
$tailsimg = '<img src=""/>';
if ($cointoss == 1){
print $headsimg;
} else {
print $tailsimg;
}
return $cointoss;
}
...but am stuck on writing the loop. I've tried a couple ways:
#this code takes forever to load
$twoheads = 0;
for ($twoheads = 1 ; $twoheads <= 20; $twoheads++) {
$cointoss = mt_rand(0,1);
cointoss ();
if ($cointoss == 1) {
do {
cointoss ();
} while ($cointoss == 1);
}
}
#one coin flips
do {
cointoss ();
} while ($cointoss == 1);
This is a for a class, and we haven't learned arrays yet, so I need to accomplish this without them.
I understand the concept of loops executing code while a condition is true, but don't understand how to write for when a condition is no longer true.
Printing from inside of "processing functions" is a bad habit to get into. You might like to declare a showCoin($toss) function for printing. In truth, I don't know if I would bother with any custom functions.
You need to declare a variable which will hold the return value from your function.
By storing the current and previous toss values, you can write a simple check if two consecutive "heads" have occurred.
Code: (Demo)
function cointoss () {
return mt_rand(0,1); // return zero or one
}
$previous_toss = null;
$toss = null;
do {
if ($toss !== null) { // only store a new "previous_toss" if not the first iteration
$previous_toss = $toss; // store last ieration's value
}
$toss = cointoss(); // get current iteration's value
echo ($toss ? '<img src="heads.jpg"/>' : '<img src="tails.jpg"/>') , "\n";
// ^^^^^- if a non-zero/non-falsey value, it is heads, else tails
} while ($previous_toss + $toss != 2);
// ^^^^^^^^^^^^^^^^^^^^^^- if 1 + 1 then 2 breaks the loop
Possible Output:
<img src="heads.jpg"/>
<img src="tails.jpg"/>
<img src="tails.jpg"/>
<img src="tails.jpg"/>
<img src="heads.jpg"/>
<img src="heads.jpg"/>
I'm trying to get a custom function in php to return a random number between 1 and 20 that does not repeat i.e. produce the same number more than once, since I need to subsequently use this number to navigate to one of twenty web pages, and I don't want the same web page displayed.
Here is my code in three steps:
<form action="rand.php">
<p>Click this button to display a random number that does not repeat...</p>
<p><input type="submit" value="Generate"></p>
</form>
Here is rand.php:
require_once('functions.php');
$page = generateNumber();
echo $page;
Here is functions.php:
<?php
$check = array();
function generateNumber() {
global $check;
$page_no = mt_rand(1,20);
$check[] = $page_no;
if (count($check) != 1) {
foreach ($check as $val) {
if ($val == $page_no) {
$page_no = mt_rand(1,10);
continue;
}
}
return $page_no;
}
else {
return $page_no;
}
}
?>
My code seem to be functioning, however, it is repeating numbers so I am obviously doing something wrong. The reason I initially check the count is so that is returns the first number regardless, since it would be a single fresh number.
In order to see the number change I have been refreshing the rand.php page in my browser.
I would keep it simple.
// List numbers 1 to 20
$pages = range(1,20);
// Shuffle numbers
shuffle($pages);
// Get a page
$page = array_shift($pages);
In order to go through all the 20 numbers on each page visit, without repeating, you will need to set a session variable.
<?php
session_start();
if (!isset($_SESSION['numbers'])) {
$_SESSION['numbers']="*"; //---create the session variable
}
function get_number() {
$i = 0;
do {
$num=rand(1,20); //---generate a random number
if (!strstr($_SESSION['numbers'],"*".$num."*")) { //---check if the number has already been used
$_SESSION['numbers']=$_SESSION['numbers'] . $i . "*"; //---add the number to the session variable to avoid repeating
if (substr_count($_SESSION['numbers'],"*")>=21) { //---resets the session variable when all 20 number have been used
$_SESSION['numbers']="*";
}
$i=$num; //---ends the while loop to return the value
}
} while ($i==0);
return $i;
}
?>
I'm not really understanding why this is, but Pager is producing paginated results like the following:
http://www.mywebsite.ca/reports-publications/reports/?field_executive_summary_value=&field_publication_date_value[value]&field_report_type_tid_selective=All&field_natural_resource_region_tid_selective=All&field_forest_district_tid_selective=All&field_keywords_tid_selective=All&page=1#
Instead of simply:
http://www.mywebsite.ca/reports-publications/reports/?page=1
Additionally, "page=1" represents the second page ... as in an array of pages where 0 is actually the first result.
Does anyone know why Pager is producing links like this?
I was able to fix the page number issue by altering pager.inc file.
in pager_find_page function,
function pager_find_page($element = 0) {
$page = isset($_GET['page']) ? $_GET['page'] : '';
$page_array = explode(',', $page);
if (!isset($page_array[$element])) {
// Change here
// $page_array[$element] = 0;
$page_array[$element] = 1;
}
// Add this
$page_array[$element]--;
return (int) $page_array[$element];
}
and, in theme_pager_link function,
if ($new_page = implode(',', pager_load_array($page_new[$element], $element, explode(',', $page)))) {
// Change here
// $parameters['page'] = $new_page;
$parameters['page'] = $new_page + 1;
}
I'm trying to loop through a set of records, all of which have a "number" property. I am trying to check if there are 3 consecutive records, e.g 6, 7 and 8.
I think i'm almost there with the code below, have hit the wall though at the last stage - any help would be great!
$nums = array();
while (count($nums <= 3))
{
//run through entries (already in descending order by 'number'
foreach ($entries as $e)
{
//ignore if the number is already in the array, as duplicate numbers may exist
if (in_array($e->number, $num))
continue;
else
{
//store this number in the array
$num[] = $e->number;
}
//here i need to somehow check that the numbers stored are consecutive
}
}
function isConsecutive($array) {
return ((int)max($array)-(int)min($array) == (count($array)-1));
}
You can achieve the same result without looping, too.
If they just have to be consecutive, store a $last, and check to make sure $current == $last + 1.
If you're looking for n numbers that are consecutive, use the same, except also keep a counter of how many ones fulfilled that requirement.
$arr = Array(1,2,3,4,5,6,7,343,6543,234,23432,100,101,102,103,200,201,202,203,204);
for($i=0;$i<sizeof($arr);$i++)
{
if(isset($arr[$i+1]))
if($arr[$i]+1==$arr[$i+1])
{
if(isset($arr[$i+2]))
if($arr[$i]+2==$arr[$i+2])
{
if(isset($arr[$i+3]))
if($arr[$i]+3==$arr[$i+3])
{
echo 'I found it:',$arr[$i],'|',$arr[$i+1],'|',$arr[$i+2],'|',$arr[$i+3],'<br>';
}//if3
}//if 2
}//if 1
}
I haven't investigated it thoroughly, maybe can be improved to work faster!
This will confirm if all items of an array are consecutive either up or down.
You could update to return an array of [$up, $down] or another value instead if you need direction.
function areAllConsecutive($sequence)
{
$up = true;
$down = true;
foreach($sequence as $key => $item)
{
if($key > 0){
if(($item-1) != $prev) $up = false;
if(($item+1) != $prev) $down = false;
}
$prev = $item;
}
return $up || $down;
}
// areAllConsecutive([3,4,5,6]); // true
// areAllConsecutive([3,5,6,7]); // false
// areAllConsecutive([12,11,10,9]); // true
Here's an example that can check this requirement for a list of any size:
class MockNumber
{
public $number;
public function __construct($number)
{
$this->number = $number;
}
static public function IsListConsecutive(array $list)
{
$result = true;
foreach($list as $n)
{
if (isset($n_minus_one) && $n->number !== $n_minus_one->number + 1)
{
$result = false;
break;
}
$n_minus_one = $n;
}
return $result;
}
}
$list_consecutive = array(
new MockNumber(0)
,new MockNumber(1)
,new MockNumber(2)
,new MockNumber(3)
);
$list_not_consecutive = array(
new MockNumber(5)
,new MockNumber(1)
,new MockNumber(3)
,new MockNumber(2)
);
printf("list_consecutive %s consecutive\n", MockNumber::IsListConsecutive($list_consecutive) ? 'is' : 'is not');
// output: list_consecutive is consecutive
printf("list_not_consecutive %s consecutive\n", MockNumber::IsListConsecutive($list_not_consecutive) ? 'is' : 'is not');
// output: list_not_consecutive is not consecutive
If u don't wanna mess with any sorting, picking any of three numbers that are consecutive should give you:
- it either is adjacent to both the other numbers (diff1 = 1, diff2 = -1)
- the only number that is adjacent (diff = +-1) should comply the previous statement.
Test for the first condition. If it fails, test for the second one and under success, you've got your secuence; else the set doesn't comply.
Seems right to me. Hope it helps.
I think you need something like the following function (no need of arrays to store data)
<?php
function seqOfthree($entries) {
// entries has to be sorted descending on $e->number
$sequence = 0;
$lastNumber = 0;
foreach($entries as $e) {
if ($sequence==0 or ($e->number==$lastNumber-1)) {
$sequence--;
} else {
$sequence=1;
}
$lastNumber = $e->number;
if ($sequence ==3) {
// if you need the array of sequence you can obtain it easy
// return $records = range($lastNumber,$lastNumber+2);
return true;
}
}
// there isn't a sequence
return false;
}
function isConsecutive($array, $total_consecutive = 3, $consecutive_count = 1, $offset = 0) {
// if you run out of space, e.g. not enough array values left to full fill the required # of consecutive count
if ( $offset + ($total_consecutive - $consecutive_count ) > count($array) ) {
return false;
}
if ( $array[$offset] + 1 == $array[$offset + 1]) {
$consecutive_count+=1;
if ( $consecutive_count == $total_consecutive ) {
return true;
}
return isConsecutive($array, $total_consecutive, $consecutive_count, $offset+=1 );
} else {
return isConsecutive($array, $total_consecutive, 1, $offset+=1 );
}
}
The following function will return the index of the first of the consecutive elements, and false if none exist:
function findConsecutive(array $numbers)
{
for ($i = 0, $max = count($numbers) - 2; $i < $max; ++$i)
if ($numbers[$i] == $numbers[$i + 1] - 1 && $numbers[$i] == $numbers[$i + 2] - 2)
return $i;
return false;
}
Edit: This seemed to cause some confusion. Like strpos(), this function returns the position of the elements if any such exists. The position may be 0, which can evaluate to false. If you just need to see if they exist, then you can replace return $i; with return true;. You can also easily make it return the actual elements if you need to.
Edit 2: Fixed to actually find consecutive numbers.
I have a MySQL table holding lots of records that i want to give the user access to. I don't want to dump the entire table to the page so i need to break it up into 25 records at a time, so i need a page index. You have probably seen these on other pages, they kind of look like this at the base of the page:
< 1 2 3 4 5 6 7 8 9 >
For example, when the user clicks on the '4' link, the page refreshes and the offset is moved on (4th page x 25 records). Here is what i already have:
function CreatePageIndex($ItemsPerPage, $TotalNumberOfItems, $CurrentOffset, $URL, $URLArguments = array())
{
foreach($URLArguments as $Key => $Value)
{
if($FirstIndexDone == false)
{
$URL .= sprintf("?%s=%s", $Key, $Value);
$FirstIndexDone = true;
}
else
{
$URL .= sprintf("&%s=%s", $Key, $Value);
}
}
Print("<div id=\"ResultsNavigation\">");
Print("Page: ");
Print("<span class=\"Links\">");
$NumberOfPages = ceil($TotalNumberOfItems / $ItemsPerPage);
for($x = 0; $x < $NumberOfPages; $x++)
{
if($x == $CurrentOffset / $ItemsPerPage)
{
Print("<span class=\"Selected\">".($x + 1)." </span>");
}
else
{
if(empty($URLArguments))
{
Print("".($x + 1)." ");
}
else
{
Print("".($x + 1)." ");
}
}
}
Print("</span>");
Print(" (".$TotalNumberOfItems." results)");
Print("</div>");
}
Obviously this piece of code does not create a dynamic index, it just dumps the whole index at the bottom of the page for every page available. What i need is a dynamic solution that only shows the previous 5 pages and next 5 pages (if they exist) along with a >> or something to move ahead 5 or so pages.
Anybody seen an elegant and reusable way of implementing this as i feel i'm re-inventing the wheel? Any help is appreciated.
Zend Framework is becoming a useful collection and includes a Zend_Paginator class, which might be worth a look. Bit of a learning curve and might only be worth it if you want to invest the time in using other classes from the framework.
It's not too hard to roll your own though. Get a total count of records with a COUNT(*) query, then obtain a page of results with a LIMIT clause.
For example, if you want 20 items per page, page 1 would have LIMIT 0,20 while page 2 would be LIMIT 20,20, for example
$count=getTotalItemCount();
$pagesize=20;
$totalpages=ceil($count/$pagesize);
$currentpage=isset($_GET['pg'])?intval($_GET['pg']):1;
$currentpage=min(max($currentpage, 1),$totalpages);
$offset=($currentpage-1)*$pagesize;
$limit="LIMIT $offset,$pagesize";
It's called Pagination:
a few examples:
A nice one without SQL
A long tutorial
Another tutorial
And Another
And of course.. google
How about this jQuery-plugin?
So all the work is done on the clientside.
http://plugins.jquery.com/project/pagination
demo: http://d-scribe.de/webtools/jquery-pagination/demo/demo_options.htm
Heres an old class I dug out that I used to use in PHP. Now I handle most of it in Javascript. The object takes an array (that you are using to split the stack into pages) and return the current view. This can become tedious on giant tables so keep that in mind. I generally use it for paging through small data sets of under 1000 items. It can also optionally generate your jump menu for you.
class pagination {
function pageTotal($resultCount, $splitCount) {
if (is_numeric($resultCount) && is_numeric($splitCount)) {
if ($resultCount > $splitCount) {
$pageAverage = (integer)$resultCount / $splitCount;
$pageTotal = ceil($pageAverage);
return $pageTotal;
} else {
return 1;
}
} else {
return false;
}
}
function pageTotalFromStack($resultArray, $splitCount) {
if (is_numeric($splitCount) && is_array($resultStack)) {
if (count($resultStack) > $splitCount) {
$resultCount = count($resultStack);
$pageAverage = (integer)$resultCount / $splitCount;
$pageTotal = ceil($pageAverage);
return $pageTotal;
} else {
return 1;
}
} else {
return false;
}
}
function makePaginationURL($preURL, $pageTotal, $selected=0, $linkAttr=0, $selectedAttr=0) {
if (!empty($preURL) && $pageTotal >= 1) {
$pageSeed = 1;
$passFlag = 0;
$regLink = '<a href="{url}&p={page}"';
if (is_array($linkAttr)) $regLink .= $this->setAttributes($linkAttr); //set attributes
$regLink .= '>{page}</a>';
$selLink = '<a href="{url}&p={page}"';
if (is_array($selectedAttr)) $selLink .= $this->setAttributes($selectedAttr); //set attributes
$selLink .= '>{page}</a>';
while($pageSeed <= $pageTotal) {
if ($pageSeed == $selected) {
$newPageLink = str_replace('{url}', $preURL, $selLink);
$newPageLink = str_replace('{page}', $pageSeed, $newPageLink);
} else {
$newPageLink = str_replace('{url}', $preURL, $regLink);
$newPageLink = str_replace('{page}', $pageSeed, $newPageLink);
}
if ($passFlag == 0) {
$passFlag = 1;
$linkStack = $newPageLink;
} else {
$linkStack .= ', ' . $newPageLink;
}
$pageSeed++;
}
return $linkStack;
} else {
return false;
}
}
function splitPageArrayStack($stackArray, $chunkSize) {
if (is_array($stackArray) && is_numeric($chunkSize)) {
return $multiArray = array_chunk($stackArray, $chunkSize);
} else {
return false;
}
}
}