Sorry if the title is not that clear.
Scenario: I have an array with 500+ items.
Problem: I need to pass the items into a function which accept arrays no bigger then 20 items.
My Solution:
$sliceSize = 20;
if(count($arr) > $sliceSize) {
for($c = 0; count($arr) - $c*$sliceSize >= 0; $c++ ) {
$show = array_slice($arr, $c*$sliceSize, $sliceSize, true);
if(count($show) > 0)
the_fantastic_function($show);
}
}
Is there a better, compact and more performing way to do it?
You can use array_chunk
$arr = array_chunk($arr, 20);
foreach($arr AS $chunk) {
the_fantastic_function($chunk);
}
I'm trying to find a way to replace any duplicated value but the only solution I have found so far is array_unique which doesn't really work for me as I need the duplicate to be replaced by another number which itself is not a duplicate.
function generate_random_numbers($rows, $delimiter)
{
$numbers = array();
for($i = 0; $i < $delimiter; $i++)
{
$numbers[$i] = rand(1, $rows);
if(in_array($i, $numbers))
{
$numbers[$i] = rand(1, $row);
}
}
return $numbers;
}
$numbers = generate_random_numbers(20, 10);
print_r($numbers);
would anyone help me out on this one please?
You can do this way easier and faster.
Just create an array for all possible numbers with range(). Then shuffle() the array and take an array_slice() as big as you want.
<?php
function generate_random_numbers($max, $amount) {
if($amount > $max)
return [];
$numbers = range(1, $max);
shuffle($numbers);
return array_slice($numbers, 0, $amount);
}
$numbers = generate_random_numbers(20, 10);
print_r($numbers);
?>
And if you want to get 490 unique elements from a range from 1 - 500, 10'000 times:
My version: ~ 0.7 secs
Your version: Order 2 birthday cakes, you will need them.
You are inserting a random number and then, if it is already in the array (which it MUST be because you just inserted it), you use a new random number, which might be a duplicate. So, you have to get a number that is not a duplicate:
do {
$num = rand(1,$rows);
} while(!in_array($num, $numbers));
Now, you know that $num is not in $numbers, so you can insert it:
$numbers[] = $num;
You were pretty close.
The if-clause needs to be a loop, to get new random number.
(Also your in_array was slightly wrong)
function generate_random_numbers($rows, $delimiter) {
$numbers = array();
for($i = 0; $i < $delimiter; $i++) {
do {
$number = rand(1, $rows);
}
while(in_array($number, $numbers));
$numbers[] = $number;
}
return $numbers;
}
So I have an array:
$array = array('Sun','Mon','Tue','Wed','Thu','Fri','Sat');
Obviously they're indexed 0-6.
I want to feed in a specific key index, and then reorder the array, beginning with that key, then going through the rest in the same order, like so:
print_r(somefunction(3, $array));
which would print this:
array
(
'0'=>'Wed',
'1'=>'Thu',
'2'=>'Fri',
'3'=>'Sat',
'4'=>'Sun',
'5'=>'Mon',
'6'=>'Tue'
)
Is there a core function that would do this, or does anyone have a quick solution?
UPDATE
Here's my final function, slightly bigger in scope than my question above, which utilizes AbraCadaver's answer:
public static function ordered_weekdays($format = 'abr')
{
$array = $format == 'full' ? array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday') : array('Sun','Mon','Tue','Wed','Thu','Fri','Sat');
return array_merge(array_splice($array, get_option('start_of_week'), count($array)-1), $array);
}
Because it's a nice one-liner, I didn't need to make it a separate function.
I've done this before and thought it was simpler than this, but here is what my brain says at the moment:
$index = 3;
$array = array_merge(array_splice($array, $index, count($array)-1), $array);
Try something along these lines...
function reorder($x,$y)
{
$c = count($y);
for ($i=0; $i<$c; $i++)
{
$newArray[$i] = $y[$x];
$x++;
if ($x > $c) $x = 0;
}
return($newArray);
}
function somefunction($n, array $a) {
$x = array_slice($a, 0, $n);
$y = array_slice($a, $n);
return array_merge($y, $x);
}
// forget this: uneccessary looping...
function somefunction($n, array $a) {
for($i = 0; $i < $n; $i++) {
array_push($a, array_shift($a));
}
return $a;
}
How can I implement the code:
$numberList3 = array();
for($i = 0; $i < 10; $i++)
{
$numberList3[$i] = $i;
}
print_r($numberList3);
Using a foreach loop as the no. of times the loop is going to execute is decided by the user at run time.
Any suggestion.?
Use array_fill maybe?
<?php
$n = 10;
$arr = array_fill(0,$n,0);
foreach($arr as $k => $v) {
$arr[$k] = $k;
}
print_r($arr);
Or, as suggested by #deceze, use range
<?php
$n = 10;
$arr = array();
foreach(range(0,$n-1) as $v) {
$arr[$v] = $v;
}
print_r($arr);
Or when the value is the same as the key, you can use just this:
<?php
$n = 10;
$arr = range(0,$n-1);
// no foreach needed
print_r($arr);
foreach() works for object and array not for a single value.
What you can do create an array or object from users input.
like:
$userInput = 10;
$forEachArray = array_fill(0, $userInput, 0);
$arrayToDisplay = array();
foreach($forEachArray as $key){
$arrayToDisplay[$key] = $key;
}
print_r($arrayToDisplay);
This question already has answers here:
Transposing multidimensional arrays in PHP
(12 answers)
Is there a php function like python's zip?
(14 answers)
Closed 10 months ago.
So, imagine you have 3 arrays:
1,2,3,4,5
6,7,8,9,10
11,12,13,14,15
And you want to combine them into new arrays based on index:
1,6,11
2,7,12
3,8,13
4,9,14
5,10,15
What on earth could achieve this? Also, the total number of arrays is not known.
EDIT: Here's a snippet of my code so far (pulling data from a DB):
<?php
$ufSubmissions = $wpdb->get_results( $wpdb->prepare("SELECT * FROM wp_user_feedback WHERE user = '$ufUser' ORDER BY date DESC") );
$cleanedResponses = array();
foreach ($ufSubmissions as $submission) {
$cleanedResponses[] = unserialize($submission->responses);
}
array_map(null, $cleanedResponses));
?>
Doesn't seem to be working though, even $cleaned responses is an array of arrays.
Mostly like Alex Barrett's answer, but allows for an unknown number of arrays.
<?php
$values = array(
array(1,2,3,4,5),
array(6,7,8,9,10),
array(11,12,13,14,15),
);
function array_pivot($values)
{
array_unshift($values, null);
return call_user_func_array('array_map', $values);
}
print_r(array_pivot($values));
If your arrays are all the same length, you can pass as many as you want to the array_map function with null as the callback parameter.
array_map(null,
array(1, 2, 3, 4, 5),
array(6, 7, 8, 9, 10),
array(11, 12, 13, 14, 15));
The above will return the following two-dimensional array:
array(array(1, 6, 11),
array(2, 7, 12),
array(3, 8, 13),
array(4, 9, 14),
array(5, 10, 15));
This is a documented trick, so quite safe to use.
$ret = array();
for ($i =0; $i < count($input[0]); $i++){
$tmp = array();
foreach ($input as $array) {
$tmp[] = $array[$i];
}
$ret[] = $tmp;
}
Em... What's the problem? If they are equal sized, then you do
<?php
$a = array(1,2,3,4,5);
$b = array(6,7,8,9,10);
$c = array(11,12,13,14,15);
$d = array();
for ($i = 0; $i < sizeof($a); $i++) {
$d[] = array($a[$i], $b[$i], $c[$i]);
}
var_dump($d);
This is not tested, read it to get the idea instead of paste it.
The point is to put everything alltoghether in a feed and then redistribute it onto new arrays of a max length, the last one could not be full.
<?php
// initial vars
$max_size = 3; // of the new arrays
$total_array = $a + $b + $c; // the three arrays summed in the right order
$current_size = length($total_array);
$num_of_arrays = ceil($current_size / $max_size);
// redistributing
$result_arrays = array();
for($i = 0; $i < $num_of_arrays; $i++){ // iterate over the arrays
$new_array= array();
for($t = 0; $t < $max_size){
$pos = $num_of_arrays * $t + $i;
if(isset($total_array[$pos]) {
$new_array[] = $total_array[$pos];
}
}
$result_arrays[] = $new_array;
}
?>
// This takes an unlimited number of arguments and merges into arrays on index
// If there is only 1 argument it is treated as an array of arrays
// returns an array of arrays
function merge_on_indexes () {
$args = func_get_args();
$out = array();
if (count($args) == 1) for ($i = 0; isset($args[0][$i]); $i++) for ($j = 0; isset($args[0][$i][$j]); $j++) $out[$j][] = $args[0][$i][$j]; else for ($i = 0; isset($args[$i]); $i++) for ($j = 0; isset($args[$i][$j]); $j++) $out[$j][] = $args[$i][$j];
return $out;
}
// Usage examples
// Both return array('data1','data3','data5'),array('data2','data4','data6')
$arr1 = array('data1','data2');
$arr2 = array('data3','data4');
$arr2 = array('data5','data6');
$result = merge_on_indexes($arr1,$arr2);
print_r($result);
$multiDimArr = array(
array('data1','data2'),
array('data3','data4'),
array('data5','data6')
);
$result = merge_on_indexes($multiDimArr);
print_r($result);
$arr = get_defined_vars(); //gets all your variables
$arrCount = 0;
$arrOfarrs = array();
foreach($arr as $var){ //go through each variable
if(is_array($var)){ //and see if it is an array
$arrCount++; //we found another array
for($i == 0;$i < count($var); $i++){ //run through the new array
$arrOfarrs[$i][] == $var[$i]; //and add the corresponding elem
}
}
}