Definition and Usage
The uniqid() function generates a unique ID based on the microtime (current time in microseconds).Syntax
uniqid(prefix,more_entropy)
| Parameter | Description |
|---|---|
| prefix | Optional. Specifies a prefix to the unique ID (useful if two scripts generate ids at exactly the same microsecond)Note: This parameter became optional in PHP 5 |
| more_entropy | Optional. Specifies more entropy at the end of the
return value. This will make the result more unique. When set to TRUE, the
return string will be 23 characters. Default is FALSE, and the return string will be 13 characters long |
Example
echo uniqid();
4415297e3af8c
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