HTMLSelectLimitField.php

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<?php

class HTMLSelectLimitField extends HTMLSelectField {
    function validate( $value, $alldata ) {
        if ( $value == '' ) {
            return true;
        }

        // Let folks pick an explicit limit not from our list, as long as it's a real numbr.
        if ( !in_array( $value, $this->mParams['options'] )
            && $value == intval( $value )
            && $value > 0
        ) {
            // This adds the explicitly requested limit value to the drop-down,
            // then makes sure it's sorted correctly so when we output the list
            // later, the custom option doesn't just show up last.
            $this->mParams['options'][$this->mParent->getLanguage()->formatNum( $value )] =
                intval( $value );
            asort( $this->mParams['options'] );
        }

        return true;
    }
}