PHP：version_compare（）在比较5.2和5.2.0时返回-1？

Question

version_compare('5.2', '5.2.0'); // returns -1, as if the second parameter is greater!

Isn't 5.2 and 5.2.0 suppose to be equal? (isn't 5.2 and 5.2.0.0 are also equal)?

Answer 1

The documentation says it compares 'two "PHP-standardized" version number strings'.

You're comparing one PHP-standardized version number string with one non-PHP-standardized version number string.