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Comparison is used to compare numeric values. It supports “is greater”, “is less”, “greater or equal”, “less or equal”, “is less”, “equal to”, and “not equal”. Some examples are shown below:

var $validate = array(
    'age' => array(
        'rule' => array('comparison', '>=', 18),
        'message' => 'Must be at least 18 years old to qualify.'
    )
);

var $validate = array(
    'age' => array(
        'rule' => array('comparison', 'greater or equal', 18),
        'message' => 'Must be at least 18 years old to qualify.'
    )
);

1. var $validate = array(
2. 'age' => array(
3. 'rule' => array('comparison', '>=', 18),
4. 'message' => 'Must be at least 18 years old to qualify.'
5. )
6. );
7. var $validate = array(
8. 'age' => array(
9. 'rule' => array('comparison', 'greater or equal', 18),
10. 'message' => 'Must be at least 18 years old to qualify.'
11. )
12. );