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uniqid()

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<?php
$string = uniqid (
    , // [string $prefix = ""]
     ✓?  // [bool $more_entropy = false]
);
?>
Result
$string = '650e01ece5f865.04069038'
Examples
#1 uniqid  ()
#2 uniqid  ("php_")
#3 uniqid  ("",
 true)
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