(PHP 4 >= 4.1.0)
version_compare -- Compares two "PHP-standardized" version number strings
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.
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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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