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# version_compare

(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.

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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