I've tried to do a number(decimal) increment which looks like 001 002 003...123,124 in a loop and couldn't find a simple solution.What I've thought now is to check out whether the number is long enough ,if not prefix it some "0".But it seems not good.Any better ideas?
Thanks.
$x = 6
$y = sprintf("%03d",$x);
http://php.net/manual/en/function.sprintf.php
for($i=1;$i<1000;$i++){
$number = sprintf("%03d",$i);
echo "$number <br />";
}
Two options come immediately to mind. First, try str_pad(). It does exactly what you seem to describe.
Second, you could use sprintf() as another has suggested.
If you are not sure how long the various numbers will turn out to be (e.g., they are determined dynamically and no way of knowing what they will be until afterwards), you can use the following code:
<?php
$numbers = array();
for ($i = 0; $i < 2000; $i++)
{
$numbers[] = $i;
}
array_walk($numbers, function(&$item, $key, $len) { $item = sprintf('%0'.$len.'d', $item); }, strlen(max($numbers)));
print_r($numbers);
?>
Related
I have this array which links numbers to letters at the moment like this:
1-26 = A-Z
But there is more, 27=AA and 28=AB etc...
so basically when I do this:
var_dump($array[2]); //shows B
var_dump($array[29]); //shows AC
Now this array I made myself but it's becoming way too long. Is there a way to actually get this going on till lets say 32? I know there is chr but I dont think I can use this.
Is there an easier way to actually get this without using this way too long of an array?
It's slower calculating it this way, but you can take advantage of the fact that PHP lets you increment letters in the same way as numbers, Perl style:
function excelColumnRange($number) {
$character = 'A';
while ($number > 1) {
++$character;
--$number;
}
return $character;
}
var_dump(excelColumnRange(2));
var_dump(excelColumnRange(29));
here is the code which you are looking for :
<?php
$start = "A";
$max = 50;
$result = array();
for($i=1; $i<=$max; $i++) {
$result[$i] = $start++;
}
print_r($result);
?>
Ref: http://www.xpertdeveloper.com/2011/01/php-strings-unusual-behaviour/
This should work for you:
Even without any loops. First I calculate how many times the alphabet (26) goes into the number. With this I define how many times it has to str_repleat() A. Then I simply subtract this number and calculate the number in the alphabet with the number which is left.
<?php
function numberToLetter($number) {
$fullSets = (($num = floor(($number-1) / 26)) < 0 ? 0 : $num);
return str_repeat("A", $fullSets) . (($v = ($number-$fullSets*26)) > 0 ? chr($v+64) : "");
}
echo numberToLetter(53);
?>
output:
AAA
I am in doubt what to use:
foreach(){
// .....
if(!in_array($view, $this->_views[$condition]))
array_push($this->_views[$condition], $view);
// ....
}
OR
foreach(){
// .....
array_push($this->_views[$condition], $view);
// ....
}
$this->_views[$condition] = array_unique($this->_views[$condition]);
UPDATE
The goal is to get array of unique values. This can be done by checking every time if value already exists with in_array or add all values each time and in the end use array_unique. So is there any major difference between this two ways?
I think the second approach would be more efficient. In fact, array_unique sorts the array then scans it.
Sorting is done in N log N steps, then scanning takes N steps.
The first approach takes N^2 steps (foreach element scans all N previous elements). On big arrays, there is a very big difference.
Honestly if you're using a small dataset it does not matter which one you use. If your dataset is in the 10000s you'll most definitely want to use a hash map for this sort of thing.
This is assuming the views are a string or something, which it looks like it is.
This is typically O(n) and possibly the fastest way to deal with tracking unique values.
foreach($views as $view)
{
if(!array_key_exists($view,$unique_views))
{
$unique_views[$condition][$view] = true;
}
}
TL;DR: foreach combined with if (!in_array()) is better.
Truthfully you should not really worry about what performs better; in most cases the difference is so small, its negligible (unless you're really doing some big data stuff). I would suggest to go with whatever seems more readable.
If you're interested, check out this script I wrote. It loops each case 100.000 times and both take between 50 and 200 ms.
https://3v4l.org/lkTCF
Note that array_unique() keeps the original keys so to counter that we also have to wrap the result with array_values().
In case the link ever dies:
<?php
$loops = 100000;
$start = microtime(true);
for ($l = 0; $l < $loops; $l++) {
$x = [1,2,3,4,6,7,8,9];
for ($i = 0; $i <= 10; $i++) {
if (!in_array($i, $x)) {
$x[] = $i;
}
}
}
$duration = microtime(true) - $start;
echo "in_array took $duration<br>".PHP_EOL;
$start = microtime(true);
for ($l = 0; $l < $loops; $l++) {
$x = [1,2,3,4,6,7,8,9];
$x = array_values(array_unique(array_merge($x, [0,1,2,3,4,5,6,7,8,9,10])));
}
$duration = microtime(true) - $start;
echo "array_unique took $duration<br>".PHP_EOL;
foreach(($_POST["msg"] as $mg) AND ($_POST["control"] as $id))
{
echo $mg;
echo $id;
}
i need make something like that, any way to do? i'm trying to get 10 mysql records and edit all of them
No, that won't work. The closest thing I can see to what you're trying to do is:
for($i = 0; $i < count($_POST["msg"]); $i++) {
echo $_POST["msg"][$i];
echo $_POST["control"][$i];
}
Assuming that "msg" and "control" will always contain the same amount of items.
Assuming both $_POST['msg'] and $_POST['control'] are actually arrays, have numeric keys (thanks #iMoses), and have the same length, you could use a for loop -
for ($i = 0; $i < count($_POST["msg"]); $i++){
$mg = $_POST['msg'][$i];
$id = $_POST['control'][$i];
}
For an ecommerce site I want to generate a random coupon code that looks better than a randomly generated value. It should be a readable coupon code, all in uppercase with no special characters, only letters (A-Z) and numbers (0-9).
Since people might be reading this out / printing it elsewhere, we need to make this a simple-to-communicate value as well, perhaps 8-10 characters long.
Something like perhaps,
AHS3DJ6BW
B83JS1HSK
(I typed that, so it's not really that random)
$chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$res = "";
for ($i = 0; $i < 10; $i++) {
$res .= $chars[mt_rand(0, strlen($chars)-1)];
}
You can optimize this by preallocating the $res string and caching the result of strlen($chars)-1. This is left as an exercise to the reader, since probably you won't be generating thousands of coupons per second.
Try this:
substr(base_convert(sha1(uniqid(mt_rand())), 16, 36), 0, 10)
Why don't keep it simple?
<?php
echo strtoupper(uniqid());
?>
Always returns 13 character long uppercased random code.
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. Simple PHP coupon code generator
Example:
coupon::generate(8); // J5BST6NQ
http://webarto.com/35/php-random-string-generator
Here you go.
function randr($j = 8){
$string = "";
for($i=0;$i < $j;$i++){
srand((double)microtime()*1234567);
$x = mt_rand(0,2);
switch($x){
case 0:$string.= chr(mt_rand(97,122));break;
case 1:$string.= chr(mt_rand(65,90));break;
case 2:$string.= chr(mt_rand(48,57));break;
}
}
return strtoupper($string); //to uppercase
}
If there are no security requirements for these, then you don't really need randomly generated codes. I would just use incremental IDs, such as those generated by whatever RDBMS you use. Optionally, if you have different types of coupons, you could prefix the codes with something, e.g.:
CX00019 QZ0001C
CX0001A QZ0001D
CX0001B QZ0001E
Alternately, you could even use dictionary words in the coupon, as such coupon codes are easier to remember and faster for users to type. Companies like Dreamhost use these for their promo codes, e.g.:
Promo60
NoSetupFee
YELLOWGORILLA82
Some of these are obviously human-created (which you might want to have the option of), but they can also be generated using a dictionary list. But even if they are randomly-generated nonsense phrases, the fact that the characters follow a logical pattern still makes it much more user-friendly than something like R7QZ8A92F1. So I would strongly advise against using the latter type of coupon codes just on the basis that they "look cool". Your customers will thank you.
$size = 12;
$string = strtoupper(substr(md5(time().rand(10000,99999)), 0, $size));
function generateCouponCode($length = 8) {
$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$ret = '';
for($i = 0; $i < $length; ++$i) {
$random = str_shuffle($chars);
$ret .= $random[0];
}
return $ret;
}
you can find a lot of function in php rand manual
http://php.net/manual/en/function.rand.php
i like this one
<?php
//To Pull 8 Unique Random Values Out Of AlphaNumeric
//removed number 0, capital o, number 1 and small L
//Total: keys = 32, elements = 33
$characters = array(
"A","B","C","D","E","F","G","H","J","K","L","M",
"N","P","Q","R","S","T","U","V","W","X","Y","Z",
"1","2","3","4","5","6","7","8","9");
//make an "empty container" or array for our keys
$keys = array();
//first count of $keys is empty so "1", remaining count is 1-7 = total 8 times
while(count($keys) < 8) {
//"0" because we use this to FIND ARRAY KEYS which has a 0 value
//"-1" because were only concerned of number of keys which is 32 not 33
//count($characters) = 33
$x = mt_rand(0, count($characters)-1);
if(!in_array($x, $keys)) {
$keys[] = $x;
}
}
foreach($keys as $key){
$random_chars .= $characters[$key];
}
echo $random_chars;
?>
$length = 9;
$code = (strtoupper(substr(md5(time()), 0, $length)));
Just Write
$voucher_no = date('ymd') . rand(1000, 9999);
while(SapItem::where('voucher_no', $voucher_no)->exists()){
$voucher_no = date('ymd') . rand(1000, 9999);
}
Output: 2204171447
$i=0000;
while($i<=1231)
{
print "$i";
$i++;
}
I want it to display 0001,
0002,
0003,
0004,
but instead it prints:
0,
1,
2
Does anyone know why this isn't working?
Thank you in advance.
Try using printf("%04s",$i);
print str_pad($i,4,'0',STR_PAD_LEFT);
is only one way... you could also use sprintf.
PHP treats the string 0000 as number 0 when considering incrementation. The ++ incrementation operator can actually work on normal strings too, but due to PHP's type handling, it doesn't work as you expect in this case. However, if you had started with string like a0000, then incrementing it would result in a0001. For example:
<?php
$var = 'a0000';
for ($i = 0; $i < 100; $i++)
{
$var++;
}
echo $var; // Outputs a0100
?>
Although, since this method of using the incrementation operator is a bit unorthodox, I would recommend using printf("%04d", $var) (or sprtinf()) in this case instead, when outputting. For example:
<?php
$var = 0;
for ($i = 0; $i < 100; $i++)
{
printf('%04d ', $var);
$var++;
}
?>
sprintf(), str_pad()
try this $x = str_pad($z + 1, 5, 0, STR_PAD_LEFT);