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PHP Uniqid () Function

The uniqid() function takes a prefix and more_entropy as parameters and returns a unique identifier based on a timestamp as a string.Syntax:
uniqid ($prefix, $more_entropy) 
Parameters used:The uiqid() function in PHP takes two parameters.
  • $prefix: This is an optional parameter which specifies the prefix for the unique identifier.
  • $more_entropy: This is an optional parameter that gives more entropy at the end of the return value, making the identifier more unique. The default is - FALSE, which returns a string that is 13 characters long, whereas TRUE returns a string that is 23 characters long.
  • Return Value:Returns a unique identifier based on a timestamp in as a string.Errors and exceptions
  • The uniqid() function tries to create a unique identifier, but it does not guarantee 100% uniqueness of the return value.
  • Since most systems set the system clock via NTP or the like, the system time is constantly changing. Therefore, it is possible that this function does not return a unique identifier for the process / thread.
  • The following programs illustrate the uniqid() function:Program 1:
    // generate a unique identifier echo uniqid(); ?>
    Output:
    3b2c662647f18 
    Program 2:
    // generate a unique identifier using pefix gfg $myuid = uniqid (gfg); echo $myuid ; ?>
    Output:
    gfg5b2b451823970 
    Program 3:
    // generate a unique identifier using pefix gfg
    // and higher entropy $myuid = uniqid (gfg, true); echo $myuid ; ?>
    Output:
    gfg5b2b4555ab6bd7.27884925 
    Link: http: // php .net / manual / en / function.uniqid.php
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