How to use rand to generate Random numbers in PHP

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Rand generates random numbers

The rand () function uses libc's random number generator to generate random numbers, which is generally slow and uncertain, so it is recommended to use the mt_rand function instead.

The getrandmax () function returns the maximum random number that the rand function can produce (my system is 32767), so don't overshoot the return value of getrandmax when setting the second parameter of the rand function.

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