I want to create somthing like 100 var's which their names will be:
$numbr_1 = 1;
$numbe_2 = 2;
$number_3 = 3;
...
I won't write 100 vars of course, but there is a way to do it with foor loop or somthing? I thought about this:
for ($i = 1; $i <= 100; $i++)
$number_{$i} = $i;
You're talking about variable variables, and they are incredibly stupid to use. For one, they make debugging next to impossible.
What you want is an array:
for ($i = 1; $i <= 100; $i++) {
$numbers[$i] = $i;
}
Something like this should work:
for($i = 1 ; $i <= 100 ; $i++){
$var_name = "number_$i";
$$var_name = $i;
}
for($i=1;$i<=100;$i++) {
$j="number$i";
$$j = $i;
}
Why don't you use an array?
$number = array();
for ($i = 0; $i < 100; $i++)
{
$number[] = $i;
}
for($i = 1 ; $i <= 100 ; $i++){
${'number_'.$i} = $i;
}
Possible solution is usage of array.
$number = array();
for ($i = 1; $i <= 100; $i++) {
$number[$i] = $i;
}
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);
My target: create dynamic variables like
$counterMon00 = 0;
$counterMon01 = 0;
$counterThu23 = 0;
My code until now:
$array_days = ["Mon","Tue","Wed","Thu","Fri"];
for ($i = 0; $i < sizeof($array_days); $i++)
{
$weekDay = (String) $array_days[$i];
for($ii = 7; $ii < 10; $ii++)
{
"counter".${$weekDay}.${$ii} = 0;
}
}
Can You help my with this line
"counter".${$weekDay}.${$ii} = 0;
I tried different solution but nothing worked ...
You need to have the variable set as a single string before using it.
$var = "counter".$weekDay.$ii;
$$var = 0;
${"counter".$weekDay.$ii} = 0;
Try using variable variables:
$varName = "counter".${$weekDay}.${$ii};
$$varName = 0;//Note the $$
You also may want to look into building an array rather than the above as this would be easier (in my opinion at least). Something like an array mapping weekdays to counts i.e.
$arr["Mon"][3] = 0;
You want an array! That's exactly what they're for. Variable variables are a bad idea in 99% of all cases.
$counter = [];
$days = ["Mon","Tue","Wed","Thu","Fri"];
foreach ($days as $day) {
foreach (range(7, 9) as $i) {
$counter[$day][$i] = 0;
}
}
$array_days = array("Mon","Tue","Wed","Thu","Fri");
for ($i = 0; $i < count($array_days); $i++)
{
$weekDay = (String) $array_days[$i];
for($ii = 7; $ii < 10; $ii++)
{
$var="counter".$weekDay.$ii;
$$var;
}
}
Please try the following you make a mistake in the array declaration also
<?php
$array_days = array("Mon","Tue","Wed","Thu","Fri");
for ($i = 0; $i < sizeof($array_days); $i++)
{
$weekDay = (String) $array_days[$i];
for($ii = 7; $ii < 10; $ii++)
{
$var = "counter".$weekDay.(String)$ii;
$$var = 0;
}
}
?>
Try This
$array_days = ["Mon","Tue","Wed","Thu","Fri"];
for ($i = 0; $i < sizeof($array_days); $i++)
{
// $weekDay = $array_days[$i];
for($ii = 0; $ii < 5; $ii++)
{
//echo "counter".${$weekDay}.${$ii} = 0;
$a = "counter".$array_days[$i].$i.$ii;
$$a = 0;
}
}
i am facing a problem
can some one suggest me
for ($i = 1; $i <= 2; $i++) {
$r2 = 0;
for ($t = 1; $t <= 2; $t++) {
echo $r2;
$r2++
}
}
output is 0101;
can i get output 0123 ??? please
if
for ($i = 1; $i <= 3; $i++) {
$r2 = 0;
for ($t = 1; $t <= 3; $t++) {
echo $r2;
$r2++
}
}
output is 010101;
can output 012345678 ??? please
and if
for ($i = 1; $i <= 4; $i++) {
$r2 = 0;
for ($t = 1; $t <= 4; $t++) {
echo $r2;
$r2++
}
}
output is 01010101;
can output 0123456789101112131415 ??? please
i think you understand
thanks
In all of these cases you are initializing $r2=0; in the inner loop. It should be outside the loop.
$r2=0;
for($i=1;$i<=2;$i++){
for($t=1;$t<=2;$t++){
echo $r2;
$r2++
}
}
This would produce "1234".
why are you using two nested for loops ?
why not just use one:
for ($i=0; $i<=15; $i++) echo $i . " ";
Try this:
$r2 = 10;
for($t = 0; $t <= $r2; $t++){
echo $r2;
}
Oh wait.. I get it now, why you have the two nested loops, you want to essentially raise a number to the power of 2 in order to control the number of values output. In that case, what you want is simply this:
// this is the variable you need to change to affect the number of values outputed
$n = 2;
// Square $n
$m = $n * $n;
// Loop $m times
for ($i = 0; $i < $m; $i++) {
echo $i;
}
Would you write this code any differently? I don't mind tertiary operator by the way so any ideas that include it are also welcome
if ($stopYear < $startYear) {
for ($i = $startYear; $i >= $stopYear; $i--) {
$yearMultiOptions[$i] = $i;
}
} else {
for ($i = $startYear; $i <= $stopYear; $i++) {
$yearMultiOptions[$i] = $i;
}
}
$min = min($startYear, $stopYear);
$max = max($startYear, $stopYear);
for ($i = $min; $i <= $max; $i++) {
$yearMultiOptions[$i] = $i;
}
I don't know php, so min and max might have different syntax, but you get the idea.
You could do something like this:
$step = ($stopYear < $startYear) ? -1 : 1;
for ($i = $startYear; $i != $stopYear; $i += step) {
$yearMultiOptions[$i] = $i;
}
How can i do something like this:
for ($i = 1; $i <= $_SESSION['variable'] * $_SESSION['variable2']; $i++) {
$listo[$i] = $preparado1[$i].
for ($i = 1; $i <= $_SESSION['variable2']; $i++) {
$preparadoex[$i];
};
}
But doesnt work, i think this:
for ($i = 1; $i <= $_SESSION['variable'] * $_SESSION['variable2']; $i++) {
for ($i = 1; $i <= $_SESSION['variable2']; $i++) {
$listo[$i] = $preparado1[$i].$preparadoex[$i];
}
}
The script is simply, i have two classes the first have 2 numbers and the two have 3 numbers i should "connect" all numbers (2) in the first class with all the numbers of the second class:
F-S
1-1,
1-2,
1-3,
2-1,
2-2,
2-3
Thanks
You're re-defining $i inside of the second loop, which conflicts with the first loop's counter. Use another variable, like $j:
for($i = 1;$i <=$_SESSION['variable'] * $_SESSION['variable2']; $i++ ){
for($j = 1; $j <=$_SESSION['variable2']; $j++){
$listo[] = $preparado1[$i] . $preparadoex[$j];
}
}
You just need to use a different variable name to increment the second 'for' loop.
for($i = 1;$i <=$_SESSION['variable'] * $_SESSION['variable2']; $i++ )
{
for($j = 1; $j <=$_SESSION['variable2']; $j++)
{
$listo[] = $preparado1[$i] . $preparadoex[$j];
}
}
You can have multiple nested loop, not just two. The only thing you have to make sure is that they each use a unique loop counter.
for($i = 1;$i <=$_SESSION['variable'] * $_SESSION['variable2']; $i++ ){
for($j = 1; $j <=$_SESSION['variable2']; $j++){
$listo[$i] = $preparado1[$i] . $preparadoex[$i];
}
}
In your test case your second for should use another variable like $j.