I would like to Convert simple string to set based on below logic
if string is 3,4-8-7,5 then I need the set as (3,8,7),(4,8,5).
The Logic behind to building the set are we need to consider ',' as OR condition and '-' as AND condition.
I am trying my best using For loop :
$intermediate = array();
$arry_A = explode('-', '3,4-8-7,5');
for ($i = 0; $i < count($arry_A); $i++) {
$arry_B = explode(',', $arry_A[$i]);
for ($j = 0; $j < count($arry_B); $j++) {
if (count($intermediate) > 0) {
for ($k = 0; $k < count($intermediate); $k++) {
$intermediate[$k] = $intermediate[$k] . ',' . $arry_B[$j];
}
} elseif (count($intermediate) === 0) {
$intermediate[0] = $arry_B[$j];
}
}
}
echo $intermediate, should give final result.
This Code works correctly, Try this
<?php
$intermediate = array();
$str="";
$val='3,4-8-7,5';
$vals=str_replace(',','-',$val);
$j=1;
$arry_A = explode('-',$vals );
$str.='(';
for ($i = 0; $i < count($arry_A); $i++) {
if($j==3){
$str.=$arry_A[$i].',';
$str.='),';
$str.='(';
$j=1;
}
else
$str.=$arry_A[$i].',';
$j++;
}
echo substr($str, 0, -2);
?>
Related
I'm trying to look for a number with maximum divisors in a range of 1 - 10000.
I succeeded, but then I wish to verify if there exist more than two max divisors and print them out. My array is really the problem. How can I clear an array and assign a new integer to it in an if else if statement?
Here is what I have tried:
function countDivisors(){
$input = 10000;
$maxNumOfDiv = -1;
$intWMaxDivs = -1;
$curNumOfDiv = 0;
$arr = array();
for($i=1; $i <= $input; $i++) {
$curNumOfDiv = 0;
for ($j = 1; $j < $i; $j++){
if ($i % $j == 0)
$curNumOfDiv++;
}
if($curNumOfDiv = $maxNumOfDiv){
$arr[] = $i;
$intWMaxDivs = $i;
$maxNumOfDiv = $curNumOfDiv;
} else if($curNumOfDiv > $maxNumOfDiv){
$arr = array();
$arr[] = $intWMaxDivs
$maxNumOfDiv = $curNumOfDiv;
}
}
for ($i; $i < count($arr); $i++){
echo $arr[$i]['intWMaxDivs'];
echo $arr[$i]['maxNumOfDiv'];
}
$div = [];
$maxDivKey = false;
$maxDiv = 0;
for($i = 1; $i <= 10000; $i++) {
for ($j = 1; $j < $i; $j++){
if ($i % $j == 0){
$div[$i][] = $i.'/'.$j.'='.$i/$j;
}
if($j == $i-1){
$count = count($div[$i]);
$div[$i]['count'] = $count;
if($maxDiv < $count){
$maxDiv = $count;
$maxDivKey = $i;
}
}
}
}
echo '<h1>Max divisors:</h1>';
print_r($div[$maxDivKey]);
//print_r($div);
I may be misunderstanding this question a little. If you are looking for a single number with maximum number of dividers, it should be something like this.
<?php
$max_num=10000;
$start_num=1;
$max_divs=-1;
$max_number=-1;
$numbers=array();
$max_divs_arr=array();
for($i=$start_num;$i<=$max_num;$i++)
{
$divs=0;
$div_array=array();
for($j=$start_num;$j<=$i;$j++)
{
if($i%$j==0)
{
$divs++;
$div_array[]=$j;
}
}
if($divs==$max_divs)
$max_divs_arr[$i]=$div_array;
if($divs>$max_divs)
{
$max_divs_arr=array();
$max_divs=$divs;
$max_divs_arr[$i]=$div_array;
}
}
foreach($max_divs_arr as $number=>$divisors)
echo "\nNumber with most divisors is $number\nIt has $max_divs divisors\nThose divisors are:".implode(',',$divisors);
I build a webpage to crack simple MD5 hash of a four digit pin for fun. The method I used was basically try all combination and check against the MD5 value the user has entered. Below is the PHP code I created to accomplish the goal.
Debug Output:
<?php
$answer = "PIN not found";
if (isset($_GET['md5'])) {
$txt = 'abcdefjhig';
$time_pre = microtime(TRUE);
$value = $_GET['md5'];
$show = 15;
for ($i = 0; $i <= 9; $i++) {
$first = $i;
for ($j = 0; $j <= 9; $j++) {
$second = $j;
for ($k = 0; $k <= 9; $k++) {
$third = $k;
for ($x = 0; $x <= 9; $x++) {
$fourth = $x;
$whole = $first . $second . $third . $fourth;
$check = hash('md5', $whole);
if ($check == $value) {
$answer = $whole;
echo "The pin is $answer";
}
if ($show > 0) {
print"$check $whole \n";
$show = $show - 1;
}
}
}
}
}
echo "\n";
$time_post = microtime(TRUE);
print "Elapsed time:";
print $time_post - $time_pre;
}
?>
Notice that in the middle there are four very similar for loops,I tried to simplify this by using functions, but it just returns one four digit number which is 9999 instead of all of them.
Below is the function I created:
function construct($input){
for($i=0; $i<=9, $i++){
$input=$i;
}
return $input
}
Then I tried to call this function for four times to form all of the four digit numbers but it just gives me 9999. Can anybody help? Thanks a lot.
Try this:
for ($i=0; $i<=9999 ; $i++) {
$whole = sprintf('%04d', $i);
$check=hash('md5', $whole);
if($check==$value){
$answer=$whole;
echo "The pin is $answer";
break; //remove this if you do not want to break the loop here
}
if ($show>0) {
print"$check $whole \n";
$show=$show-1;
}
}
You're using numbers from 0 to 9999, so why just loop through those numbers? You can add zero's by using str_pad() like so:
for ($i = 0; $i <= 9999; $i++) {
$whole = str_pad($i, 4, '0', STR_PAD_LEFT);
}
Also I'd like to mention that you really should think about better formatting of your code, especially indentation
$big_box = array(1,2,3,16,17,18,31,32,33,46,47,48,61,62,63,76,77,78,91,92,93,106,107,108,121,122,123,136,137,138............);
$small_box = array(4,19,34,49,64.............);
I want to generate dynamic numbers array like above example upto 10000.
For Array $big_box Try to something like this.
$j = 0;
for ($i=0; $i <= 1000; $i++) {
if ($i!=0) {
$big_box[] = $i;
$j++;
}
if ($j == 3) {
$j = 1;
$big_box[] = $i+13;
$i =$i+13;
}
}
echo "<pre>";
print_r($big_box);
And array $small_box
$small_box = array();
for($i=0; $i <= 1000; $i++) {
if ($i == 0) {
$small_box[$i] = 4;
}else{
$small_box[$i] = $small_box[$i-1]+15;
}
}
echo "<pre>";
print_r($small_box);
Why does this not make two arrays one within 7 numbers and one within 2 numbers in it?
It somehow combines the both into one.
When i echo $arvottuLottoRivi and $lottoLisaNumerot in my HTML page the result is:
$arvottuLottoRivi (1,2,3,4,5,6,7,8,9,10) : $lottoLisaNumerot
all the seven numbers.
I have now tried three different styles but same thing happens in all cases
// VARAIBLES
$lottoNumerot = $_POST["lottoNumerot"];
$mahdollisetNumerot = array("1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33","34","35","36","37","38","39");
$i = 0;
$l = 0;
$k = 0;
//ARRAYS
$arvottuLottoRivi = array();
$lottoLisaNumerot = array();
$tenNumbersArray = array();
//FUNCTIONS
$numeroidenRandomointi = array_rand($mahdollisetNumerot, 10);
// COUNTS ARRAY LENGHT
$lottoRivinPituus = count($numeroidenRandomointi);;
// LOOPS
foreach($numeroidenRandomointi as $randomNumero){
while($i <= $lottoRivinPituus){
$i++;
}
$randomToArray = array_push($tenNumbersArray, $randomNumero);
}
// LOOPIT
foreach($tenNumbersArray as $randomToSite){
while($l <= $lottoRivinPituus){
$l++;
}
if($l <= 7){
array_push($arvottuLottoRivi, $randomToSite);
}
}
foreach($tenNumbersArray as $randomToSiteLisanuimerot){
while($k <= $lottoRivinPituus){
$k++;
}
if($k >= 7){
array_push($lottoLisaNumerot, $randomToSiteLisanuimerot);
}
}
$arvottuLottoRivi = implode(' ', $arvottuLottoRivi);
$lottoLisaNumerot = implode(' ', $lottoLisaNumerot);
When you write:
foreach($tenNumbersArray as $randomToSiteLisanuimerot){
while($k <= $lottoRivinPituus){
$k++;
}
if($k >= 7){
array_push($lottoLisaNumerot, $randomToSiteLisanuimerot);
}
}
the while loop is equivalent to:
$k = $lottoRivinPituus + 1;
Since $lottoRivinPituus is 10, $k is always 11. Therefore, if($k >= 7) is always true, so all elements of $randomToSiteLisanuumerot are copied to $lottoLisaNumerot. Similarly, in the previous loop, the test if ($l <= 7) is always false, so nothing is copied to $arvottuLottoRivi.
I think you were trying to test the current position in the loop, not the count of all elements in the array. You can do it like this:
foreach($tenNumbersArray as $l => $randomToSite){
if($l < 7){
array_push($arvottuLottoRivi, $randomToSite);
}
}
foreach($tenNumbersArray as $k => $randomToSiteLisanuimerot){
if($k >= 7){
array_push($lottoLisaNumerot, $randomToSiteLisanuimerot);
}
}
But this wastes time iterating over elements it doesn't care about. A better way would be:
$arvotSize = min(7, $lottoRivinPituus);
for ($l = 0; $l < $arvotSize; $l++) {
array_push($arvottuLottoRivi, $tenNumbersArray[$l]);
}
for ($k = $arvotSize; $k < $lottoRivinPituus; $k++) {
array_push($lottoLisaNumerot, $tenNumbersArray[$k]);
}
I really didn't get your code.
Why don't use rand function?
$randomNumbers1 = array();
$randomNumbers2 = array();
$i = 0;
while ($i < 7) {
$aNumber = rand(1, 39);
if (!in_array($aNumber, $randomNumbers1)) {
$randomNumbers1[] = $aNumber;
$i++;
}
}
$i = 0;
while ($i < 2) {
$aNumber = rand(1, 39);
if (!in_array($aNumber, $randomNumbers2)) {
$randomNumbers2[] = $aNumber;
$i++;
}
}
And if the seconds array cannot contains any number within the first one:
$i = 0;
while ($i < 2) {
$aNumber = rand(1, 39);
if (!in_array($aNumber, $randomNumbers2) && !in_array($aNumber, $randomNumbers1)) {
$randomNumbers2[] = $aNumber;
$i++;
}
}
I found this Stack Overflow post explaining how you can generate random coupon codes.
I'm looking into using that code and generate multiple coupons at once (e.g. 50), while separate them by a comma.
The output would be: COUPON-HMECN, COUPON-UYSNC, etc.
Code below and codepad example available.
$chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$res = "COUPON-";
for ($i = 0; $i < 5; $i++) {
$res .= $chars[mt_rand(0, strlen($chars)-1)];
}
echo $res . ",";
$chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$numCodesToGenerate = 5;
for ($n = 0; $n < $numCodesToGenerate; $n++)
{
$res = "COUPON-";
for ($i = 0; $i < 5; $i++) {
$res .= $chars[mt_rand(0, strlen($chars)-1)];
}
echo $res . ",";
}
Why not use uniqid()?
$coupon_str = '';
$seperator = '';
for($i = 0; $i < 50; $i++) {
$coupon_str .= $seperator . uniqid('COUPON-');
$seperator = ',';
}
echo $coupon_str;
Output:
COUPON-502373ac95dd2,COUPON-502373ac95de8,COUPON-502373ac95ded,....
Here is a much neater version (and faster) that does what you need:
function MakeCouponCode() {
$res = "COUPON-";
for($i = 0; $i < 5; ++$i)
$res .= chr(mt_rand(0, 1) == 0 ? mt_rand(65, 90) : mt_rand(48, 57));
return $res;
}
$coupons = array();
for($i = 0; $i < 5; ++$i)
$coupons[] = MakeCouponCode();
echo implode(', ', $coupons);
Output:
COUPON-D707Y, COUPON-4B37E, COUPON-3O397, COUPON-M799X, COUPON-24Q36
You can use the coupon code generator PHP class file to generate N number of coupons and its customizable, with various options of adding own mask with own prefix and suffix. The coupon codes are separated by comma. Simple PHP coupon code generator
Example:
coupon::generate(8); // J5BST6NQ