PHP 7 >= 7.2.0, PHP 8
sodium_memcmp - Test for equality in constant-time

sodium_memcmp( string$string1, string$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 leaks with bool-to-int conversions, sodium_memcmp is an ideal replacement.



String to compare


Other string to compare

Return Values

Returns 0 if both strings are equal; -1 otherwise.

Function sodium_memcmp:

  • Manual

Sodium Functions

Most used PHP functions