How PHP obtains a specified length of hash

Requirements: Gets the specified length of the hash, such as 4-bit, 8-bit length
Requirements:

1. Maximum avoidance of hash collisions
2. High execution efficiency

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Requirements: Gets the specified length of the hash, such as 4-bit, 8-bit length
Requirements:

1. Maximum avoidance of hash collisions
2. High execution efficiency

Improved: substr (MD5 (Uniqid (rand (), True)), 6);

How about this?

In the case of 4-bit, there is a total of 62 *62 *62 *62=14776336 results (62=26 in English case and 10 numbers) so the probability of a hash collision is very large. Of course not to say that you cannot use a four-bit hash, if you need to hash the number of values less than this result can be fully four-bit hash.

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