HTMLIntField.php

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<?php
 
class HTMLIntField extends HTMLFloatField {
 
    public function validate( $value, $alldata ) {
        $p = parent::validate( $value, $alldata );
 
        if ( $p !== true ) {
            return $p;
        }
 
        # https://www.w3.org/TR/html5/infrastructure.html#signed-integers
        # with the addition that a leading '+' sign is ok. Note that leading zeros
        # are fine, and will be left in the input, which is useful for things like
        # phone numbers when you know that they are integers (the HTML5 type=tel
        # input does not require its value to be numeric).  If you want a tidier
        # value to, eg, save in the DB, clean it up with intval().
        if ( !preg_match( '/^((\+|\-)?\d+)?$/', trim( $value ?? '' ) ) ) {
            return $this->msg( 'htmlform-int-invalid' );
        }
 
        return true;
    }
}