The following is the code
<?php
$id ="202883-202882-202884-0";
$str = implode('-',array_unique(explode('-', $id)));
echo $str;
?>
The result is
202883-202882-202884-0
for$id ="202883-202882-202882-0";
, result is202883-202882-0
I would like to replace the duplicate value with zero, so that the result should be like202883-202882-0-0
, not just remove it.
and for$id ="202883-0-0-0";
, result should be202883-0-0-0
. zero should not be replaced, repeating zeros are allowed.
How can I archive that?
More info:
I want to replace every duplicate numbers. Because this is for a product comparison website. There will be only maximum 4 numbers. each will be either a 6 digit number or single digit zero. all zero means no product was selected. one 6 digit number and 3 zero means, one product selected and 3 blank.
Each 6 digit number will collect data from database, I dont want to allow users to enter same number multiple times (will happen only if the number is add with the URL manually.).
Update: I understand that my question was not clear, may be my English is poor.
Here is more explanation, this function is for a smartphone comparison website.
The URL format issitename.com/compare.html?id=202883-202882-202889-202888
.
All three numbers are different smartphones(their database product ID).
I dont want to let users to type in the same product ID likeid=202883-202882-202882-202888
. It will not display two 202882 results in the website, but it will cause some small issues. The URL will be same without change, but the internal PHP code should consider it asid=202883-202882-202888-0
.
The duplicates should be replaced as zero and added to the end.
There will be only 4 numbers separated by "-".
The following examples might clear the cloud!
ifpid=202883-202882-202889-202888
the result should be202883-202882-202889-202888
ifpid=202883-202883-202883-202888
the result should be202888-0-0-0
ifpid=202883-202882-202883-202888
the result should be202883-202882-202888-0
ifpid=202882-202882-202882-202882
the result should be202882-0-0-0
I want to allow only either 6 digit numbers or single digit zero through the string.
ifpid=rgfsdg-fgsdfr4354-202883-0
the result should be202883-0-0-0
ifpid=fasdfasd-asdfads-adsfds-dasfad
the result should be0-0-0-0
ifpid=4354-45882-445202882-202882
the result should be202882-0-0-0
It is too complicated for me create, I know there are bright minds out there who can do it much more efficiently than I can.
You can do a array_unique (preserves key), then fill the gaps with0
. Sort by key and you are done :)
+
on arrays will the arrays but prioritizes the one on the left.
Code
$input = "0-1-1-3-1-1-3-5-0";
$array = explode('-', $input);
$result = array_unique($array) + array_fill(0, count($array), 0);
ksort($result);
var_dump(implode('-',$result));
Code (v2 - suggested by mickmackusa) - shorter and easier to understand
Fill an array of the size of the input array. And replace by leftover values fromarray_unique
. Noksort
needed.0
s will be replaced at the preserved keys ofarray_unique
.
$input = "0-1-1-3-1-1-3-5-0";
$array = explode('-', $input);
$result = array_replace(array_fill(0, count($array), 0), array_unique($array));
var_export($result);
Working example.
Output
string(17) "0-1-0-3-0-0-0-5-0"
Working example.
references
0
of a certain lengthThis is another way to do it.
$id = "202883-202882-202882-0-234567-2-2-45435";
From the String you explode the string into an array based on the delimiter which in this case is '-'/
$id_array = explode('-', $id);
Then we can loop through the array and for every unique entry we find, we can store it in another array. Thus we are building an array as we search through the array.
$id_array_temp = [];
// Loop through the array
foreach ($id_array as $value) {
if ( in_array($value, $id_array_temp)) {
// If the entry exists, replace it with a 0
$id_array_temp[] = 0;
} else {
// If the entry does not exist, save the value so we can inspect it on the next loop.
$id_array_temp[] = $value;
}
}
At the end of this operation we will have an array of unique values with any duplicates replaced with a 0.
To recreate the string, we can use implode...
$str = implode('-', $id_array_temp);
echo $str;
Refactoring this, using a ternary to replace the If,else...
$id_array = explode('-', $id);
$id_array_temp = [];
foreach ($id_array as $value) {
$id_array_temp[] = in_array($value, $id_array_temp) ? 0 : $value;
}
$str = implode('-', $id_array_temp);
echo $str;
Output is
202883-202882-0-0-234567-2-0-45435
This appears to be a classic XY Problem.
The essential actions only need to be:
You see, there is no benefit to replacing/sanitizing anything when you only really need to validate the input data. Adding zeros to your input just creates more work later.
In short, you should use a direct approach similar to this flow:
if (!empty($_GET['id'])) {
$ids = array_unique(explode('-', $_GET['id']));
foreach ($ids as $id) {
if (ctype_digit($id) && strlen($id) === 6) {
// or: if (preg_match('~^\d{6}$~', $id)) {
takeYourNecessaryAction($id);
}
}
}
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