uniqid
Function • Params and return types changed in PHP 8.0
Generate a time-based identifier.
uniqid Function synopsis
uniqid(string $prefix = "", bool $more_entropy = false): stringParameters
$prefix
OptionalTypestringDefault value""
Can be useful, for instance, if you generate identifiers simultaneously on several hosts that could generate the same identifier at the same microsecond. (This can happen even on a single host if the system clock is moved backwards, such as by an NTP adjustment.)
$more_entropy
OptionalTypeboolDefault valuefalse
If set to true, uniqid will add additional
entropy (using the combined linear congruential generator) at the end
of the return value, which increases the likelihood that the result
will be unique.
Return value
Typestring
Returns timestamp based identifier as a string.
This function does not guarantee the uniqueness of the return value.Changes to the uniqid Function
PHP 8.0
- Return type added:
string - Parameter type added for parameter #1 (
$prefix):string - Parameter default value added for position #1 (
$prefix):"" - Parameter type added for parameter #2 (
$more_entropy):bool - Parameter default value added for position #2 (
$more_entropy):false
- uniqid($prefix, $more_entropy)
+ uniqid(string $prefix = "", bool $more_entropy = false): stringuniqid Function Availability
uniqid Function Availability| PHP Version | Availability |
|---|---|
| PHP 8.6Upcoming Release | Yes |
| PHP 8.5Supported (Latest) | Yes |
| PHP 8.4Supported | Yes |
| PHP 8.3Security-Fixes Only | Yes |
| PHP 8.2Security-Fixes Only | Yes |
| PHP 8.1Unsupported | Yes |
| PHP 8.0Unsupported | Yes |
| PHP 7.4Unsupported | Yes |
| PHP 7.3Unsupported | Yes |
| PHP 7.2Unsupported | Yes |
| PHP 7.1Unsupported | Yes |
| PHP 7.0Unsupported | Yes |
| PHP 5.6Unsupported | Yes |
| PHP 5.5Unsupported | Yes |
| PHP 5.4Unsupported | Yes |
| PHP 5.3Unsupported | Yes |