I have 20 variables, each holding a number between 1 and 10000.
Is there a simple way of checking that all of the variables hold a unique value, and if not sending the user away.
for example,
if($var1,$var2,$var3...etc are not unique)
{
location wherever.php
exit;
}
The front end should prevent the user submitting the same value twice however I need to check it.
Thanks :)
$data = array( /* your numbers */);
$unique = array_unique($data);
if ( count($data) != count($unique) ) {
// not unique
}
You can also compare that arrays instead of counting their elements:
if ( $data != $unique ) {
// not unique
}
Put the values in an array.
Pass the array to the php function
array array_unique ( array $array [, int $sort_flags = SORT_STRING ] )
If the array returned by the function is smaller then the input then it found non unique keys.
$arr = array($var1, $var2 ... );
$arr2 = array_unique($arr);
if(count($arr) != count($arr2)){
// send location;
}
i would make a function that uses array_unique()
like this:
function is_unique($array) {
if (count(array_unique($array)) < count($array)) return false;
return true;
}
then you have to use headers to redirect the client from php:
if (!is_unique($array)) {
header("location: whatever");
}
note that headers must be sent before any html code. If you cant do that you have to use javascripts window.location = url to redirect the client
It would be very easy if the variable where in an array.
$var[1] = 590;
$var[2] = 614;
etc etc
Then you can do:
foreach ($var as $a_key => $a){
foreach($var as $b_key => $b){
if($a==$b && $a_key != $b_key){
//Do whatever you want to do.
}
}
}
This method will allow you to perform a function on each matching pair, or as a response to each matching pair.
Put each of the variables into an array $variables = array( $var1, $var2 , ... )
sort($variables)
$before = null;
foreach($var as $variables) {
if ($before = $var) { // $var is not unique
header("Location: whereever.php");
die();
}
$before = $var;
}
// if you reach this point, all variables were unique
