Description
int
version_compare ( string version1, string version2 [, string operator])
version_compare() compares two
"PHP-standardized" version number strings. This is useful if you
would like to write programs working only on some versions of
PHP.
version_compare() returns -1 if the first
version is lower than the second, 0 if they are equal, and +1 if
the second is lower.
If you specify the third optional operator
argument, you can test for a particular relationship. The
possible operators are: <,
lt, <=,
le, >,
gt, >=,
ge, ==,
=, eq,
!=, <>,
ne respectively. Using this argument, the
function will return 1 if the relationship is the one specified
by the operator, 0 otherwise.
Example 1. version_compare() Example // prints -1
echo version_compare("4.0.4", "4.0.6");
// these all print 1
echo version_compare("4.0.4", "4.0.6", "<");
echo version_compare("4.0.6", "4.0.6", "eq"); |
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