Laravel unique random string number

Question

I would like to make an infinite string with a number. What is the best way to do this here e.g. mt_rand(1000000, 9000000) but if between 1000000 and 9000000 everything is occupied there are no more numbers. The more numbers are used the more often there are errors, and the if else has to rattle through the whole table again and again.

public function creating(Ticket $ticket)
{
    $randomNumber = mt_rand(1000000, 9000000);

    if(!Ticket::where('number', '=', $randomNumber)->exists()) {
        $ticket->fill(['number' => $randomNumber]);
    } else {
        $this->creating($ticket);
    }
}

What is the best way to do this? I want it to be a Unique Numberetic String. Which has no end.

Do you need only numbers or are alphanumeric strings ok? Ex.: 29b3Fg9 — Stichoza
– Stichoza, Commented Feb 12, 2022 at 22:00

ruleboy21 · Accepted Answer · 2022-02-13 18:06:06Z

2

To guarantee a unique number you should instead use created. Whenever a ticket is created, you can prepend some random numbers to the id to generate a unique number. Try this

public function created(Ticket $ticket) {
    $ticket->number = rand(1000, 9999).str_pad($ticket->id, 3, STR_PAD_LEFT);
    $ticket->save();
}

edited Feb 13, 2022 at 18:06

answered Feb 12, 2022 at 20:42

ruleboy21

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4 Comments

Nils Vennemann Over a year ago

Now its better to use the timestamp see up comment from Muhammad Tashfeen or ur... what you are say

ruleboy21 Over a year ago

Timestamps are never unique. What if multiple records are to be created at the same time?

Nils Vennemann Over a year ago

Yes, but what is when between 1000 and 9999 all numbers used with the 3 offsets.. yk

ruleboy21 Over a year ago

See rand(1000, 9999) is to prepend some random numbers to the id you can completely ignore it. The id is the real deal. Since it is coming from the database, it is guaranteed to always be unique.

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