How to print one message from a loop within a condition? - php

Let's say I have this loop:
for($i = 1; $i <= 10; $i++){
if($i > 4){
echo 'Greater Than 4.' . '<br/>';
}
}
The previous loop will output the following:
Greater Than 4.
Greater Than 4.
Greater Than 4.
Greater Than 4.
Greater Than 4.
Greater Than 4.
As the condition is true 6 times.
What I want to do is to print this message only once so the output from the same loop and condition will be :
Greater Than 4.
I think this could be achieved by using a variable and give it this value at a specific point , But I don't know how to do it.

Well, it will be like your code expect that you print the message once:
$msg = 'There is no greater than 4';
for($i = 1; $i <= 10; $i++){
if($i > 4){
$msg = 'Greater Than 4.' . '<br/>';
// Make any additional required code here...
}
}
echo $msg;
;

Have you tried this :)
for($i=1;$i<=10;$i++){
echo ($i>4 && !isset($rslt))?$rslt='Greater Than 4.':'';
}
Or, you can loop first
then print the result
like this
$bucket = '';
for($i=1;$i<=10;$i++){
$bucket = ($i>4)?'Greater Than 4.':$bucket;
}
echo $bucket;
Hmmmm, I guess you case like this :D
$bucket = $condition = '';
$flag = 1;
for($i=1;$i<=10;$i++){
if($i>4){
$bucket = 'Greater Than 4. <br>';
$condition .= "Proses :{$flag}<br>";
$flag++;
//more condition process 6 times
}
}
echo $condition;
echo $bucket;
Or like this :D
$j=1;
for($i=1;$i<=10;$i++){
if($i>4){
if($i<=5){
echo 'Greater Than 4. <br>';
}
echo 'Proses '.($j++).'<br>';
//more condition process 6 times
}
}
Or, using the short hand
for($i= $j =0;$i<=10;$i++){
if($i>4){
echo ($i<=5)?'TheGreater Than 4. <br>':false;
$j++;
echo "Process number : {$j} <br>";
}
}

$run_once = true;
for($i = 1; $i <= 10; $i++){
if($i > 4 AND $run_once){
echo 'Greater Than 4.' . '<br/>';
$run_once = false;
}
}
you could also use if ($i == 4)
EDIT:
for($i = 1; $i <= 10; $i++){
if($i > 4){
if($i == 4){
echo 'this runs only once';
}
echo 'this runs every time';
}
}

Related

loop with symbol minus and number php

i have this code .
echo "<br>";
$start = 1;
$angka = $_POST[angka];
$a = $angka;
for($i=$start; $i<=$angka; $i++) {
for($j=$start;$j<=$angka;$j=$j+2){
echo $i;
if($j < $angka) echo $a;
}
$a--;
echo '<br>';
}
Reference: Print Looping for dynamic row php
This is not my expecting result .
First i want the result like this .
-2-4-
1-3-5
-2-4-
1-3-5
-2-4-
The rule is Number of rows and columns follow the number of numbers declared.If the declaration of the number 5, then the results will be displayed are 5 rows and 5 columns like the example above.
i think this code is working
<?php
$_POST['angka'] = 5;
$angka = $_POST['angka'];
for($i=1; $i<=$angka; $i++) {
for($j=1;$j<=$angka;$j++){
if($i%2 == 1) {
if($j%2 == 0) {
echo $j;
} else {
echo '-';
}
} else {
if($j%2 == 0) {
echo '-';
} else {
echo $j;
}
}
}
echo '<br>';
}
Result:
-2-4-
1-3-5
-2-4-
1-3-5
-2-4-

php First value of array not displaying

I have the following bit of code and for some reason in the first WHILE loop the first value of $actor_list (when $i = 0) does not display. If I simply echo $actor_list[0] then it displays fine, but in the loop it will not display. I merely get [td][/td] as the output. The remaining values of the array display fine.
Also the line
echo '</tr><tr> </br>';
is not displaying.
What am I missing here? The value of $num_actors is an even number in my test scenario so there doesn't seem to be a reason for the above echo line to be skipped.
$actor_list = explode(" ", $actors);
$num_actors = count($actor_list);
if ($num_actors <= 6) {
foreach ($actor_list as $actor) {
echo '[td]'.$actor.'[/td] </br>';
}
} elseif ($num_actors <= 12) {
if ($num_actors % 2 == 0) {
$half_actors = $num_actors / 2;
while ($i <= ($half_actors - 1)) {
echo '[td]'.$actor_list[$i].'[/td] </br>';
$i++;
}
echo '</tr><tr> </br>';
while ($i <= $num_actors) {
echo '[td]'.$actor_list[$i].'[/td] </br>';
$i++;
}
}
}
You're not initialising the variable $i to 0, which means it will be set to 'null' and thus not reference the 0th index of the array; but when it's then incremented its value will become 1.
Note: [..] Decrementing NULL values has no effect too, but incrementing them results in 1.
See: http://php.net/manual/en/language.operators.increment.php
Try adding:
$i = 0;
before the if statement.
Made a few changes.
This is working for me.
Try it out.
<?php
$actor_list = 'act1 act2 act3 act4 act5 act6';
$actors = explode(" ", $actor_list);
$num_actors = count($actor_list);
//debug
//echo "<pre>";
//print_r($actor_list);
//echo "</pre>";
echo "<table>";
if ($num_actors <= 6) {
foreach ($actors as $actor) {
echo '<tr><td>'.$actor.'</td></tr>';
}
} elseif ($num_actors <= 12) {
if ($num_actors % 2 == 0) {
$half_actors = $num_actors / 2;
while ($i <= ($half_actors - 1)) {
echo '<tr><td>'.$actor_list[$i].'</td></tr>';
$i++;
}
while ($i <= $num_actors) {
echo '<tr><td>'.$actor_list[$i].'</td></tr>';
$i++;
}
}
}
echo "</table>";
?>

how do i sum two variables in for each loop or while or for loop

is that possible to sum variable static values in the while or for loop? i have code and working on it but it sum variables only one time?
Here My Code
session_start();
$length=count($_SESSION['product1']);
$shipping2='280';
$shipping3='680';
$newshipping='0';
$newshipping1='0';
$i='0';
while($i= <$length)
{
$newshipping=$shipping2+$shipping3;
$newshipping1=$newshipping+$shipping2;
}
For Example I want like this
$shipping2='280'; should be sum with every result of $newshipping1
`$newshipping1`= $shipping2='280' + $shipping3='680' = `$newshipping1`=960
+ $shipping2='280'??
'$newshipping1`=960+ $shipping2=280+ $shipping2=280+ $shipping2=280 .....
when ever new product1 enter it should be add $shipping2=280
in the result of `$newshipping1`
I have completed my code here my final code
$length=count($_SESSION['product1']);
$shipping2=280;
$shipping3=680;
$newshipping=0;
for($i=0; $i <$length; $i++) {
if($i == 1) {
$newshipping = $shipping2+$shipping3;
} else if($i <= 100) {
$newshipping = $newshipping+$shipping2;
}
}
Your logic seems a bit confusing, however you can sum several integers. If you are trying to figure out the final amount of several iterations you should:
$shipping_one = 680;
$shipping_two = 260;
$shipping_three = 0;
$finalShipping = array();
while($i= <$length)
{
$finalShipping[] = $shipping_one + $shipping_two + $shipping_three;
}
$finalTotal = array_sum($finalShipping);
If you can clarify your question, I can clarify my answer.
this will be ((680) + (4 * 280)) like you explained in your last comment.
$length = 1;
echo "Test with $length : ".getShippingTotal($length)." <br />";
$length = 2;
echo "Test with $length : ".getShippingTotal($length)." <br />";
$length = 3;
echo "Test with $length : ".getShippingTotal($length)." <br />";
$length = 4;
echo "Test with $length : ".getShippingTotal($length)." <br />";
$length = 5;
echo "Test with $length : ".getShippingTotal($length)." <br />";
function getShippingTotal($length) {
$shipping2=280;
$shipping3=680;
$total = 0;
for($i=0; $i < $length; $i++) {
if($i == 0) {
$total += $shipping2+$shipping3;
} else {
$total += $shipping2;
}
}
return $total;
}
I have tested it and it gave me:
Test with 1 : 960
Test with 2 : 1240
Test with 3 : 1520
Test with 4 : 1800
Test with 5 : 2080

error in php program

I am just a beginner in PHP. I have tried to write a program for prime numbers, but the result is not correct. I couldn't find the error. How can I correct this? Here is my code:
<?php
$n=15;
for($i=2; $i<=$n; $i++)
{
echo "<br />";
for($j=2; $j<=$i-1; $j++)
{
$k=$i%$j;
if($k==0)
{
break;
}
else echo $i."is prime";
break;
}
}
?>
Try this:
<?php
$n=15;
for($i=2; $i<=$n; $i++)
{
$k = 1; //assume that it is prime
for($j=2; $j<$i; $j++) //if $i is 2, then it won't enter the loop as it will not match the condition ($j<$i)
{
$k=$i%$j;
if($k==0)
break; //if not prime, $k will be set as 0. So, break.
}
if($k!=0) // if $k <> 0, then it is prime
echo "<br />" . $i." is prime";
}
?>
Edit
Updated the code to take care of the "2"
Try this:(whitout using loop)
function is_prime($p) {
return ($p > 1) && (($p%2 >= 1) && ($p%3 >= 1) && ($p%5 >= 1)) || in_array($p, [2,3,5]);
}
echo is_prime(15);
You are breaking the loop the first time it's run by calling this basically:
if (something) {
break;
} else {
break;
}
it will break no matter what. you need to take out the last break.
Well, your code is kind of confusing to understand; at first glance it seems as if it's trying to determine primality by checking every divisor up to N, but you've got that outer-loop going on which I didn't see at first... Oh boy.
If you're just trying to figure out if some number N is prime, the following should work:
$n = 15
$prime = true;
for ($i = 2; $i < sqrt($n); $i++) {
if ($n % $i == 0) {
$prime = false;
break;
}
}
echo $n . " is " . ($prime ? "" : "not") . " prime.";
<?php
echo "TEST\r\n";
$n=15;
for($i=2; $i<=$n; $i++)
{
echo "I= $i \r\n";
for($j=2; $j<=$i-1; $j++)
{
$k = $i%$j;
if($k==0)
{
break;
} else {
echo $i."is prime \r\n";
}
break;
}
}
I think your secod for loop is incorrect.
for($i=2; $i<=$n; $i++) {
echo "<br />";
for($j=2; $j<=$i-1; $j++) {
...
The first value for $j is 2. And for the first time, the first value for $i is 2 again. Now, look at your second for loop code.
It will be like this at the first time:
for($j=2; $j<=2-1; $j++) ... // for($j=2; $j<=1; $j++)
And this condition is not valid at all: 2<=1

variable increment doesn't work

When I launch my web page, increment doesn't work correctly!
It should go like this: $i = from 1 to x (0,1,2,3,4,5,6 etc..).
But instead it jumps over every step giving result of (1,3,5,7 etc..).
Why is this code doing this?
<ul class="about">
<?php
$result = mysql_query("SELECT * FROM info WHERE id = 1");
while ($row = mysql_fetch_assoc($result))
{
$bioText = $row['bio'];
}
$endBioTxt = explode("\n", $bioText);
for ($i=0; $i < count($endBioTxt);)
{
if (checkNum($i) == true)
{
echo "<li class='left'><div>".$endBioTxt[$i]."</div></li>";
echo $i;
}
else
{
echo "<li class='right'><div>".$endBioTxt[$i]."</div></li>";
echo $i;
}
$i++;
}
// Function to check if number is prime
function checkNum($num){
return ($num % 2) ? TRUE : FALSE;
}
?>
</ul>
Output:
Sometext!(right side)
0
1
Sometext2!(right side)
2
3
...
Please DONT do this as other suggested:
for ($i=0; $i < count($endBioTxt); $i++)
do this:
$count = count($endBioTxt);
for ($i=0; $i < $count; $i++) {
}
No need to calculate the count every iteration.
Nacereddine was correct though about the fact that you don't need to do:
$i++;
inside your loop since the preferred (correct?) syntax is doing it in your loop call.
EDIT
You code just looks 'strange' to me.
Why are you doing:
while ($row = mysql_fetch_assoc($result))
{
$bioText = $row['bio'];
}
???
That would just set $bioText with the last record (bio value) in the recordset.
EDIT 2
Also I don't think you really need a function to calculate the modulo of a number.
EDIT 3
If I understand your answer correctly you want 0 to be in the left li and 1 in the right li 2 in the left again and so on.
This should do it:
$endBioTxt = explode("\n", $bioText);
$i = 0;
foreach ($endBioTxt as $txt)
{
$class = 'left';
if ($i%2 == 1) {
$class = 'right';
}
echo '<li class="'.$class.'"><div>'.$txt.'</div></li>';
echo $i; // no idea why you want to do this since it would be invalid html
$i++;
}
Your for statement should be:
for ($i=0; $i < count($endBioTxt); $i++)
see http://us.php.net/manual/en/control-structures.for.php
$i++; You don't need this line inside a for loop, it's withing the for loop declaration that you should put it.
for ($i=0; $i < count($endBioTxt);$i++)
{
if (checkNum($i) == true)
{
echo "<li class='left'><div>".$endBioTxt[$i]."</div></li>";
echo $i;
}
else
{
echo "<li class='right'><div>".$endBioTxt[$i]."</div></li>";
echo $i;
}
//$i++; You don't need this line inside a for loop otherwise $i will be incremented twice
}
Edit: Unrelated but this isn't how you check whether a number is prime or not
// Function to check if number is prime
function checkNum($num){
return ($num % 2) ? TRUE : FALSE;
}
This code works, please test it in your environment and then uncomment/comment what you need.
<?php
// This is how query should look like, not big fan of PHP but as far as I remember...
/*
$result = mysql_query("SELECT * FROM info WHERE id = 1");
$row = mysql_fetch_assoc($result);
$bioText = $row['bio'];
$endBioTxt = explode("\n", $bioText);
*/
$endBioTxt[0] = "one";
$endBioTxt[1] = "two";
$endBioTxt[2] = "three";
$endBioTxt[3] = "four";
$endBioTxt[4] = "five";
$totalElements = count($endBioTxt);
for ($i = 0; $i < $totalElements; $i++)
{
if ($i % 2)
{
echo "<li class='left'><div>".$endBioTxt[$i]."</div></li>";
}
else
{
echo "<li class='right'><div>".$endBioTxt[$i]."</div></li>";
}
/*
// This is how you should test if all your array elements are set
if (isset($endBioTxt[$i]) == false)
{
echo "Array has some values that are not set...";
}
*/
}
Edit 1
Try using $endBioTxt = preg_split('/$\R?^/m', $bioTxt); instead of explode.

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