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Collator::getErrorCode() is a method in PHP's Collator class. It is used to retrieve the error code associated with the last Collator operation.

The error code returned by getErrorCode() can indicate the outcome of a Collator operation. Here are some possible error codes:

- U_ZERO_ERROR: No error occurred.
- U_USING_FALLBACK_WARNING: The requested operation encountered a mismatch between the requested locale and the available data. It may have reverted to a fallback locale or performed a similar operation to provide a result.
- U_AMBIGUOUS_ALIAS_WARNING: The requested locale name has an ambiguous mapping.
- U_SORT_KEY_TOO_SHORT_WARNING: The provided output buffer for sorting keys was too short, resulting in a truncated or incomplete key.

To use Collator::getErrorCode(), you need to create an instance of the Collator class and perform a Collator operation. After that, you can call getErrorCode() on the Collator object to retrieve the error code.

Here is an example:

php
$collator = new Collator('en_US');
$result = $collator->compare('string1', 'string2');
$errorCode = $collator->getErrorCode();

if ($errorCode === Collator::U_ZERO_ERROR) {
echo "No error occurred.";
} elseif ($errorCode === Collator::U_USING_FALLBACK_WARNING) {
echo "Using fallback locale.";
} elseif ($errorCode === Collator::U_AMBIGUOUS_ALIAS_WARNING) {
echo "Ambiguous locale name.";
} elseif ($errorCode === Collator::U_SORT_KEY_TOO_SHORT_WARNING) {
echo "Sort key too short.";
} else {
echo "Unknown error.";
}


In this example, we created a Collator object using the en_US locale. We then compared two strings using the compare() method, and finally retrieved the error code using getErrorCode(). Based on the error code, we displayed an appropriate message.

Remember to replace 'string1' and 'string2' with the actual strings you want to compare.