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PHP lcg_value

PHP original manual for lcg_value [ show | php.net ]

lcg_value

(PHP 4, PHP 5, PHP 7)

lcg_value — Combined linear congruential generator

Description

float lcg_value ( void )

lcg_value() returns a pseudo random number in the range of (0, 1). The function combines two CGs with periods of 2^31 - 85 and 2^31 - 249. The period of this function is equal to the product of both primes.

Caution

This function does not generate cryptographically secure values, and should not be used for cryptographic purposes. If you need a cryptographically secure value, consider using random_int(), random_bytes(), or openssl_random_pseudo_bytes() instead.

Return Values

A pseudo random float value between 0.0 and 1.0, inclusive.

See Also

  • rand() - Generate a random integer
  • mt_rand() - Generate a random value via the Mersenne Twister Random Number Generator