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(I actually held the same opinion as you until recently: https://github.com/kalessil/phpinspectionsea/issues/1718 tl;dr the performance impact is negligible)
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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If you want some random string (e.g. for a random filename), you can use bin2hex(random_bytes(16)). This will generate a random 128 bit identifier using the CSPRNG. To be extra safe, use https://github.com/paragonie/constant_time_encoding instead of bin2hex. The constant time encoder prevents some additional (more obscure) attacks.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.