To generate two random values from two arrays, check if these values are not in a main array, and if they are in the main array, generate new random values until they are unique, you can use the following PHP code:
### PHP Code
```php
<?php
function generateUniqueRandomPairs($array1, $array2, $mainArray) {
$attempts = 0;
$maxAttempts = 1000; // To avoid infinite loop, set a maximum number of attempts
do {
// Increment attempts counter
$attempts++;
// Generate random values from each array
$randomValue1 = $array1[array_rand($array1)];
$randomValue2 = $array2[array_rand($array2)];
// Create a pair
$randomPair = [$randomValue1, $randomValue2];
// Check if the pair is not in the main array
$isUnique = true;
foreach ($mainArray as $mainPair) {
if ($mainPair === $randomPair) {
$isUnique = false;
break;
}
}
// Break if unique pair is found or max attempts reached
if ($isUnique || $attempts >= $maxAttempts) {
break;
}
} while (true);
if ($attempts >= $maxAttempts) {
throw new Exception("Failed to generate unique random pair after $maxAttempts attempts.");
}
return $randomPair;
}
//------single unique value check-----//
function generateUniqueRandomValues($array1, $array2, $mainArray) {
$attempts = 0;
$maxAttempts = 1000; // To avoid infinite loop, set a maximum number of attempts
do {
// Increment attempts counter
$attempts++;
// Generate random values from each array
$randomValue1 = $array1[array_rand($array1)];
$randomValue2 = $array2[array_rand($array2)];
// Check if the random values are not in the main array
$isUnique1 = !in_array($randomValue1, $mainArray);
$isUnique2 = !in_array($randomValue2, $mainArray);
// Break if unique values are found or max attempts reached
if ($isUnique1 && $isUnique2 || $attempts >= $maxAttempts) {
break;
}
} while (true);
if ($attempts >= $maxAttempts) {
throw new Exception("Failed to generate unique random values after $maxAttempts attempts.");
}
return [$randomValue1, $randomValue2];
}
//------------//
// Example usage
$array1 = [1, 2, 3, 4, 5];
$array2 = ['a', 'b', 'c', 'd', 'e'];
//$mainArray[] = [$row['id'], $row['value']];
$mainArray = [
[1, 'a'],
[2, 'b'],
[3, 'c']
];
try {
$uniqueRandomPair = generateUniqueRandomPairs($array1, $array2, $mainArray);
print_r($uniqueRandomPair);
} catch (Exception $e) {
echo $e->getMessage();
}
?>
```
### Explanation
1. **Function Definition**: The `generateUniqueRandomPairs` function takes three arguments: two arrays (`array1` and `array2`) from which to generate random values, and a `mainArray` containing pairs that should be avoided.
2. **Random Pair Generation**: Inside a `do-while` loop, the function generates a random value from each of the two arrays and forms a pair.
3. **Uniqueness Check**: The function checks if this pair is already present in the `mainArray`. If it is not present, it considers the pair unique. If the pair is present, it continues generating new pairs until a unique one is found or the maximum number of attempts (`$maxAttempts`) is reached.
4. **Handling Failures**: If the function fails to generate a unique pair after the maximum number of attempts, it throws an exception to avoid an infinite loop.
5. **Example Usage**: The example shows how to use the function with sample arrays and a main array containing pairs to be avoided.
This approach ensures that you get a unique random pair from the two arrays without using recursion. Adjust the arrays and the maximum number of attempts as needed for your specific use case.
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