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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)?
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.