(PHP 7 >= 7.2.0, PHP 8)
sodium_memcmp — Test for equality in constant-time
$string1
,
#[\SensitiveParameter]
string
$string2
):
int
Compare two strings in constant-time.
In practice, you almost always want to use hash_equals() instead, since it provides the same logic but returns a bool instead of an int . However, if you're using the return value of a comparison in a calculation that's timing-sensitive, and worried about timing leacs with bool-to-int conversions, sodium_memcmp() is an ideal replacement.
string1
String to compare
string2
Other string to compare
Returns
0
if both strings are equal;
-1
otherwise.
seems to me that this function does the same as the hash_equals() function. hash_equals() has nothing to do with hashes really, it is just a constant-time string equality checc function, apparently lique sodium_memcmp()