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How to generate random 4-character key from these characters: [a-zA-Z0-9]
That is less likely to collide, like a unique ID?
Also having those 62 characters by calculation would result for about 14.7 million keys.
Is there a way to stretch that limit?
The maximum possible keys is 62^4. To make this larger you need more possible characters or a longer length.
The simplest way to generate unique ids is to use a counter starting with 0..9, A-Z, a-z etc.