[PHP] uses openssl_random_pseudo_bytes and Base64_encode functions to generate random strings

The Openssl_random_pseudo_bytes function itself is used to generate a specified number of random bytes, so when you use it to generate random strings, you also need to use the function Base64_encode. As shown below:

 Public Static  function getrandomstring($length = ) {        /* * Use OpenSSL (if available) */        if(Function_exists (' Openssl_random_pseudo_bytes ')) {$bytes= Openssl_random_pseudo_bytes ($length*2);if($bytes===false)Throw NewRuntimeException (' Unable to generate a random string ');returnSUBSTR (Str_replace (['/',' + ',' = '],"', Base64_encode ($bytes)),0,$length); }$pool=' 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ';returnsubstr (Str_shuffle (Str_repeat ($pool,5)),0,$length); }

After calling the Base64_encode function, the result was also replaced once, in order to remove unwanted characters from the randomly generated string.

Of course, before using the Openssl_random_pseudo_bytes function, it is best to use function_exists to ensure that the function is available at run time. If not available, plan B is used:

substr(str_shuffle(str_repeat($pool50$length);

This function is very versatile, can be modified according to the needs of the business and then called as a static method.

[PHP] uses openssl_random_pseudo_bytes and Base64_encode functions to generate random strings