I want to set a limit for the output but I don't know how and where. Can anyone help me?
The code (excerpt):
// Editable values
// Show how many items, defaults to 10?
$max = 8;
// Fetch the items
if (!isset($actions) || empty($actions))
$actions = fillActionArray($datestart, $dateend, $section_id);
//Generating the news items
if (is_array($actions)){
foreach($actions as $item){
// Build url like : pages/kalendar.php?year=1900&month=01&day=03&id=2&detail=1
$ds = $item['date_start'];
$link = $page_link.'?year='.(substr($ds,0,4)).'&month='.(substr($ds,5,2)).'&day='.(substr($ds,8,2)).'&id='.$item['id'].'&detail=1';
}
}
Use array chunk on that news items variable "actions" based on the $max value http://php.net/manual/en/function.array-chunk.php
check the output of this -> print_r(array_chunk($actions, $max));
This is for me the simplest way:
//Generating the news items
$i=0;
if (is_array($actions)){
foreach($actions as $item)
if ($i < $max) {
// Build url like : pages/kalendar.php?year=1900&month=01&day=03&id=2&detail=1
$ds = $item['date_start'];
$link = $page_link.'?year='.(substr($ds,0,4)).'&month='.(substr($ds,5,2)).'&day='.(substr($ds,8,2)).'&id='.$item['id'].'&detail=1';
$i +=1;
?>
Related
I have the following query:
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 4");
while ($po = $trabajos->fetch_array()) {
$trab[] = $po;
}
This query is working fine, but, it shows only 4 records, but then again in another part of the same page I need the same table information but I don't want it to be limited, say I want 10 instead of only 4. so.
Section Header
Section Slider <-- here only shows 4 items as intended
Using a foreach as follow:
foreach ($trab as $it) {
// My html Code
}
Section Mid Body some info
Section Main Body More info
Section Mid End Footer <-- here I need the same information as in the slider section but with a different layout instead of only 4 items I need 10 items.
For that last item I have to open another query similar as before.
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 10");
while ($po = $trabajos->fetch_array()) {
$trab[] = $po;
}
So I was thinking is there a way to use:
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND()");
while ($po = $trabajos->fetch_array()) {
$trab[] = $po;
}
That query without the LIMIT and instead Limit the foreach to only fetch the first 4 rows or is there a way to use that query with the LIMIT but instead of 4 or 10, say I use 20, and for the first foreach only display the first 4 and for the second foreach show the rest after the first 4.
The main idea is not have more than 1 query for the same information.
this will exit a loop, but why not query 10 records, build your results, all 10 and then just output 4 of them, there and all 10 over yonder.
$x = 0;
foreach ($trab as $it) {
if($x == 5){
break; //will exit loop as will return.
}
// My html Code
++$x;
}
This will work with any kind of loop, you can also use continue to skip to the next pass of the loop
foreach ($trab as $it) {
if($x < 5){
continue; //code below here wont run until $x >= 5.
}
// My html Code
++$x;
}
i'm not sure to understand exactly what you want, but if you want to divide your array in 2 part. You can use a counter
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 20");
$i = 0;
$trab2 = new Array();
while ($po = $trabajos->fetch_array()) {
if($i < 4) {
$trab[] = $po;
} else {
$trab2[] = $po;
}
$i++;
}
First, RAND() is horrible since it essentially disables MySQL’s built in caching with each run of the query. But there is no best way for me to advise how to get around that based on your script’s requirements. So just keep that in mind. But here is what I would recommend.
That query without the LIMIT and instead Limit the foreach to only
fetch the first 4 rows or is there a way to use that query with the
LIMIT but instead of 4 or 10, say I use 20, and for the first
foreach only display the first 4 and for the second foreach show
the rest after the first 4.
Yes, just use array_slice like this:
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 20");
while ($po = $trabajos->fetch_array()) {
$trab[] = $po;
}
$trab_slice_1_size = 4;
$trab_slice_2_size = 10;
$trab_slice_1 = array_slice($trab, 0, $trab_slice_1_size);
$trab_slice_2 = array_slice($trab, $trab_slice_1_size, $trab_slice_2_size);
The nice thing about array_slice is you can cleanly select a start & end point. In my example I set the sizes in variables. Which makes it easier to adjust in your code if you somehow want to dynamically change values.
The easiest way is to use a counter variable:
function fetch_items($limit=10) {
public $trabajos,$trab;
$count=0;
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND()");
while (($po = $trabajos->fetch_array()) && ($count<$limit)) {
$count++;
$trab[] = $po;
}
}
If you call fetch_items() without a parameter, it defaults to 10 or less. If you specify a parameter it loads the array with up to the amount you specify. You could also have the function return the value of $count so you know how many were returned.
try;
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 10");
$i = 0;
while ($i < 5 && $po = $trabajos->fetch_array()) {
.....
.....
$i++;
}
then, if you want to re-use the data,
mysql_data_seek($trabajos, 0);
$i = 0;
while ($i < 11 && $po = $trabajos->fetch_array()) {
.....
.....
$i++;
}
I am facing problem to retrieve records in descending order with pagination limit from amazon dynamodb as in mysql.
Now I am using the following script, but it gives unordered list of records. I need the last inserted id is on top.
$limit = 10;
$total = 0;
$start_key = null;
$params = array('TableName' => 'event','AttributesToGet' =>array('id','interactiondate','repname','totalamount','fooding','nonfooding','pdfdocument','isMultiple','payment_mode','interaction_type','products','programTitle','venue','workstepId','foodingOther','interaction_type_other'), 'ScanFilter'=> array('manufacturername' => array("ComparisonOperator" => "EQ", "AttributeValueList" => array(array("S" => "$manufacturername")))),'Limit'=>$limit );
$itemsArray = array();
$itemsArray = array();
$finalItemsArray = array();
$finalCRMRecords = array();
do{
if(!empty($start_key)){
$params['ExclusiveStartKey'] = $start_key->getArrayCopy();
}
$response = $this->Amazon->Dynamodb->scan($params);
if ($response->status == 200) {
$counter = (string) $response->body->Count;
$total += $counter;
foreach($response->body->Items as $itemsArray){
$finalItemsArray[] = $itemsArray;
}
if($total>$limit){
$i =1;
foreach($response->body->Items as $items){
$finalItemsArray[] = $items;
if($i == $limit){
$start_key = $items->id->{AmazonDynamoDB::TYPE_NUMBER}->to_array();
$finalCRMRecords['data'] = $finalItemsArray;
$finalCRMRecords['start_key'] = $start_key;
break;
}
$i++;
}
}elseif($total<$limit){
$start_key = $response->body->LastEvaluatedKey->to_array();
}else{
$finalCRMRecords['data'] = $finalItemsArray;
if ($response->body->LastEvaluatedKey) {
$start_key =$response->body->LastEvaluatedKey->to_array();
break;
} else {
$start_key = null;
}
$finalCRMRecords['start_key'] = $start_key;
}
}
}while($start_key);
Regards
Sandeep Kumar Sinha
A Scan operation in DynamoDB can not change the sorting of the returned items. Also is Scan a pretty expensive operation as it always requires to read the whole table.
If you want to take advantage of DynamoDB, here's one advice:
Instead of looking for information, try to just find it.
In the sense of, use lookups instead of scan/query to get the information you need.
As an example, if you have a table that stores Events. Just store all events in that table, with their EventId as HashKey. Then you can have a second table EventLookups to store lookups to EventIds. In the EventLookups table you could put an Item like LookupId: LATEST-EVENT referencing some EventId: .... Every time you insert new events you can update the LATEST-EVENT entry to point to a newer Event. Or use a SET to store the latest 50 EventIds events in one Item.
-mathias
Im working on a code for generating a sports teams. I have an array with a list of players and want to store on another array all the possible team cobinations.
To make it simple, lets imagine a tennis match, where you have 4 players that will be split into two teams.
$players = array("Federer","Del Potro","Nadal","Murray");
The output array should look something like this:
$combinations[0][0] = "Federer","Del Potro";
$combinations[0][1] = "Nadal","Murray";
$combinations[1][0] = "Federer","Nadal";
$combinations[1][1] = "Del Potro","Murray";
$combinations[2][0] = "Del Potro","Nadal";
$combinations[2][1] = "Federer","Murray"; .. and so forth..
Any help?
Thanks in advance!
/// -- Edit
This is the code I have so far. All players also have a score and I store this score for later usage. Its not really important. I think I've got it working but im not sure this code gets ALL the possible combinations. What I do is I loop "player count" times and start building teams, after a team is built , I move the second player of the list to the bottom of the array and loop again.
//-- Get the Max Players and the Array of Player Names
$max_players = count($players)/2;
$p = array_keys($players);
for($i=0;$i<=(count($p));$i++){
$tmp = array();
$t=0;
//-- Loop and start placing players into a team. When the max is reached, start placing on the other team.
foreach($p as $player) {
//-- Store player on Team
$tmp[$t][] = $player;
if(count($tmp[$t])==$max_players) {
$t++;
}
}
//-- Get the second player and move it to the bottom of the list.
$second = $p[1];
unset($p[1]);
$p[] = $second;
$p = array_values($p);
//-- Loop thru teams and add the score of each player
foreach($tmp as $key=>$eq) {
$score = 0 ;
foreach($eq as $jug) {
//-- Add Score for each player
$score += floatval($players[$jug]["score"]);
}
//-- Store the sum of scores of all players in team
$tmp[$key]["score"] = $score;
}
//-- Store the Difference between team scores in this "team set"
$tmp["diff"] = abs(round($tmp[0]["score"]-$tmp[1]["score"],2));
$teams[] = $tmp;
}
Just googled and found these results from stackoverflow.com
Get all combinations of a PHP array
algorithm that will take numbers or words and find all possible combinations
PHP: How to get all possible combinations of 1D array?
$player_combination = [];
$match_combination = [];
$players = array("Federer","Del Potro","Nadal","Murray");
for($i = 0; $i< count($players);$i++){
for($j=$i+1;$j<count($players);$j++){
$player_combination[] = [$players[$i],$players[$j]];
}
}
for($i = 0; $i< count($player_combination);$i++){
for($j=$i+1;$j<count($player_combination);$j++){
if(($player_combination[$i][0] !== $player_combination[$j][0]) && ($player_combination[$i][0] !== $player_combination[$j][1])&& ($player_combination[$i][1] !== $player_combination[$j][0]) && ($player_combination[$i][1] !== $player_combination[$j][1]))
$match_combination[] = [$player_combination[$i],$player_combination[$j]];
}
}
my webiste is 9amobile.com
Hi i have a script in which there is a foreach within a foreach. The first foreach is used for id which is unique, but the second foreach used is for related images of a product which should loop according to the number of images. However, it restricts me to fetch only one related image, how can i get all related images?
$i=0;
foreach ($collection as $product_all) {
//echo $product_all->getId().'<br/>';
if($i==10) break;
$id = $product_all->getId();
$neew = Mage::getModel('catalog/product')->load($id);
//echo'<pre>';
echo 'active products id ===='.$neew ->getId().'<br/>';
echo 'active products name ===='.$neew->getname().'<br/>';
echo 'active products style_ideas ===='.$neew->getstyle_ideas().'<br/>';
echo 'active products size and fit ===='.$neew->getsize_fit().'<br/>';
echo 'active products short description ===='.$neew->getshort_description().'<br/>';
echo 'active products description ===='.$neew->getdescription().'<br/>';
//print_r($neew);
if (count($neew->getMediaGalleryImages()) > 0){
$i = 0 ;
$j = 0 ;
foreach ($neew->getMediaGalleryImages() as $_image){
$relative_image = Mage::helper('catalog/image')->init($neew->getProduct(), 'image', $_image->getFile())->resize(2000);
$relative_image1 = str_replace('/webApps/migration/productapi/new/','/',$relative_image);
//echo 'relative_image => '.$relative_image1.'<br/>';
$relative_image_save = $relative_image1 ;
$relative_image_save1 = explode('/', $relative_image_save);//explode / to get only image name
$end1 = end($relative_image_save1);
$relative_image3 = $end1;
//$handle1 = fopen( $relative_image3, 'w') or die('Cannot open file: '. $relative_image);
$path12 = '/mnt/aviesta/development/webApps/migration/productapi/new/'.'sku-'.$neew->getsku().'_' .$i++.'.jpg';
copy($relative_image_save, $path12);
echo 'relative image with sku path_'.$j++.' ====>'.$path12.'<br/><br/>';
}
}
$i++;
}
From your code i think the problem can be solved by initializing an array before your 2nd foreach loop , and storing the images in that array can help you out in fetching all the images....This is what i understood from your question. If this is correct.., than the below code may work....
foreach()
{
//Your code....
$image_list = array();
$i = 0;
foreach()
{
// Your usual code
$image_list[$i] = your_image;
//storing images one-by-one in your variable..
$i++;
}
}
You can later return the variable or just print_r(); to get the output
i think i have post the question in little hurry, the script works fine , for the initial products there was a single images for the products but for the newer products there are multiple images and the script works fine , thanks to all of you to respond the post .....
I have a game script thing set up, and when it creates a new character I want it to find an empty address for that players house.
The two relevant table fields it inserts are 'city' and 'number'. The 'city' is a random number out of 10, and the 'number' can be 1-250.
What it needs to do though is make sure there's not already an entry with the 2 random numbers it finds in the 'HOUSES' table, and if there is, then change the numbers. Repeat until it finds an 'address' not in use, then insert it.
I have a method set up to do this, but I know it's shoddy- there's probably some more logical and easier way. Any ideas?
UPDATE
Here's my current code:
$found = 0;
while ($found == 0) {
$num = (rand()%250)+1; $city = (rand()%10)+1;
$sql_result2 = mysql_query("SELECT * FROM houses WHERE city='$city' AND number='$num'", $db);
if (mysql_num_rows($sql_result2) == 0) { $found = 1; }
}
You can either do this in PHP as you do or by using a MySQL trigger.
If you stick to the PHP way, then instead of generating a number every time, do something like this
$found = 0;
$cityarr = array();
$numberarr = array();
//create the cityarr
for($i=1; $i<=10;$i++)
$cityarr[] = i;
//create the numberarr
for($i=1; $i<=250;$i++)
$numberarr[] = i;
//shuffle the arrays
shuffle($cityarr);
shuffle($numberarr);
//iterate until you find n unused one
foreach($cityarr as $city) {
foreach($numberarr as $num) {
$sql_result2 = mysql_query("SELECT * FROM houses
WHERE city='$city' AND number='$num'", $db);
if (mysql_num_rows($sql_result2) == 0) {
$found = 1;
break;
}
}
if($found) break;
}
this way you don't check the same value more than once, and you still check randomly.
But you should really consider fetching all your records before the loops, so you only have one query. That would also increase the performance a lot.
like
$taken = array();
for($i=1; $i<=10;$i++)
$taken[i] = array();
$records = mysql_query("SELECT * FROM houses", $db);
while($rec = mysql_fetch_assoc($records)) {
$taken[$rec['city']][] = $rec['number'];
}
for($i=1; $i<=10;$i++)
$cityarr[] = i;
for($i=1; $i<=250;$i++)
$numberarr[] = i;
foreach($cityarr as $city) {
foreach($numberarr as $num) {
if(in_array($num, $taken[]) {
$cityNotTaken = $city;
$numberNotTaken = $number;
$found = 1;
break;
}
}
if($found) break;
}
echo 'City ' . $cityNotTaken . ' number ' . $numberNotTaken . ' is not taken!';
I would go with this method :-)
Doing it the way you say can cause problems when there is only a couple (or even 1 left). It could take ages for the script to find an empty house.
What I recommend doing is insert all 2500 records in the database (combo 1-10 with 1-250) and mark with it if it's empty or not (or create a combo table with user <> house) and match it on that.
With MySQL you can select a random entry from the database witch is empty within no-time!
Because it's only 2500 records, you can do ORDER BY RAND() LIMIT 1 to get a random row. I don't recommend this when you have much more records.