Please tell me how can I display array in a for loop in php?
I have this array:
while($q = mysqli_fetch_assoc($selectQuestResult)) {
$answers[] = array(array($q['name']),array(round($total,1)));}
then I want display it:
for($i = 0; $i < count($answers); $i++)
{
echo($answers[$i][0][0].':'.$answers[$i][1][0]."<br />\n");
}
I must use a for loop makes this sound like stupid college professor tricks. But, that's ok. for loops can have break statements in them. And, they don't have to contain end conditions in the for statement.
for( $i = 0; ; $i++) {
$q = mysqli_fetch_assoc($selectQuestResult);
if (!$q) break;
$answers[] = array($q['name'], round( $total, 1));
}
for ( $i = 0; $i < count( $answers ), $i++) {
/* do something with $answers[i] */
}
Related
Why this piece of code works when it is clearly wrong in the second for loop (for ($i==0; $i<$parts; $i++) {)?
Does php allows for multiple comparisons inside for loops?
function split_integer ($num,$parts) {
$value = 0;
$i = 0;
$result = [];
$modulus = $num%$parts;
if ($modulus == 0) {
for($i = 0; $i < $parts; $i++)
{
$value = $num/$parts;
$result[] = $value;
}
} else {
$valueMod = $parts - ($num % $parts);
$value = $num/$parts;
for ($i==0; $i<$parts; $i++) {
if ($i >= $valueMod) {
$result[] = floor($value+1);
} else {
$result[] = floor($value);
}
}
}
return $result;
}
Code for ($i==0; $i < $parts; $i++) runs because $i==0 has no impact on loop.
In normal for loop first statement just sets $i or any other counter's initial value. As you already set $i to 0 earlier, your loop runs from $i = 0 until second statement $i < $parts is not true.
Going further, you can even omit first statement:
$i = 0;
for (; $i < 3; $i++) {
echo $i;
}
And loop will still run 3 times from 0 to 2.
I have the following code:
$extraPhoto_1 = get_field('extra_photo_1');
$extraPhoto_2 = get_field('extra_photo_2');
$extraPhoto_3 = get_field('extra_photo_3');
$extraPhoto_4 = get_field('extra_photo_4');
But I would like to rewrite it with a for loop, but I can't figure out how to put a variable within the value field. What I have so far is:
for($i = 1; $i < 5; $i++) {
${'extraPhoto_' . $i} = get_field('extra_photo_ . $i');
}
I've tried with an array like this:
$myfiles = array();
for ($i = 1; $i < 5; $i++) {
$myfiles["$extraPhoto_$i"] = get_field('extra_photo_ . $i');
}
Nothing seems to fix my problem. I'v searched on the PHP website (variable variable).
There is some bug in your code which not allowing. Use 'extra_photo_'. $i instead of 'extra_photo_. $i'
for($i = 1; $i < 5; $i++) {
$extraPhoto_.$i = get_field('extra_photo_'. $i);
}
You can build an array as defined below and than just call extract($myfiles) to access them as variables.
Again your syntax for the get field is incorrect you should append $i after the quotes.
$myfiles = array();
for ($i = 1; $i < 5; $i++) {
$myfiles["extraPhoto_".$i] = get_field('extra_photo_'.$i);
}
extract($myfiles);
If you want to create dynamic variable, use below code
for ($i = 1; $i < 5; $i++) {
${'extraPhoto_'.$i} = $_POST['extra_photo_'.$i];
}
if you want to assign variables to array use below code.
for ($i = 1; $i < 5; $i++) {
$myfiles["extraPhoto_$i"] = $_POST['extra_photo_'.$i];
/// $myfiles["extraPhoto_$i"] = get_field('extra_photo_'.$i);
}
and than to see if values are assign to new array or not, you can use below code.
echo "<pre>";print_r($myfiles);echo "</pre>";
in general I think I understand what the error message means. But in my case, it's a riddle I didn't succeed in solving...
$keywords_all = array();
$count = 0;
for ($z = 0; $z < $num_results; $z++)
{
$keywords_array = explode(",", $row['free_keywords']);
for ($i = 0; $i < count($keywords_array); $i++)
{
if (in_array(strtolower(trim($keywords_array[$i])), $keywords_all))
{
$count++;
}
else
{
echo "<br />".$keywords_array[$i];
$keywords_all[$count] = $keywords_array[$i];
}
}
$row = pg_fetch_array($result);
}
So, what's wrong with that one? The error message pops up in the line
$keywords_all[$count] = $keywords_array[$i];
I have no clue, seems to be alright to me. But guess, it's again a tiny, tiny thing I've neglected... Thanks for any hints!
I was not able to reproduce your error message. I did find a bug in your code though (I am assuming that you are putting all your keywords in the $keywords_all array without any duplicates). So you should not increment $count inside your IF but instead update the $keywords_all count. See below:
if (in_array(strtolower(trim($keywords_array[$i])), $keywords_all)) {
$count = count($keywords_all);
} else {
echo "<br />".$keywords_array[$i];
$keywords_all[$count] = $keywords_array[$i];
$count++;
}
You will increment $count after storing a value to your $keywords_all array.
$keywords_all = array();
$count = 0; // what for you neet this var ?
$myRow = 'keyW1,keyW2,keyW3,keyW2';
// for ($z = 0; $z < $num_results; $z++) // there is no variable $num_results at your code so I've replaced it with constant
for ($z = 0; $z < 1; $z++)
{
// $keywords_array = explode(",", $row['free_keywords']);
$keywords_array = explode(",", $myRow);
// for ($i = 0; $i < count($keywords_array); $i++)
foreach ($keywords_array as $keyword)
{
$keyword = strtolower( trim( $keyword ) ); // some syntax sugar would be nice
if ( !in_array( $keyword, $keywords_all) )
{
echo "<br />".$keyword;
$keywords_all[] = $keyword;
}
}
// $row = pg_fetch_array($result);
}
var_dump($keywords_all);
This code would be better for you i think, but if you just want to get rid of duplicated records
array_uniq( array("1", "1", "2", "1") )
would be better solution for you.
i am facing a problem
can some one suggest me
for ($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 $i;
}
How can i do something like this:
for ($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.