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function is not described

rest_validate_enum() WP 5.7.0

Validates that the given value is a member of the JSON Schema "enum".

No Hooks.

Return

true|WP_Error. True if the "enum" contains the value or a WP_Error instance otherwise.

Usage

rest_validate_enum( $value, $args, $param );
$value(mixed) (required)
The value to validate.
$args(array) (required)
The schema array to use.
$param(string) (required)
The parameter name, used in error messages.

Changelog

Since 5.7.0 Introduced.

Code of rest_validate_enum() WP 5.7.2

<?php
function rest_validate_enum( $value, $args, $param ) {
	$sanitized_value = rest_sanitize_value_from_schema( $value, $args, $param );
	if ( is_wp_error( $sanitized_value ) ) {
		return $sanitized_value;
	}

	foreach ( $args['enum'] as $enum_value ) {
		if ( rest_are_values_equal( $sanitized_value, $enum_value ) ) {
			return true;
		}
	}

	$encoded_enum_values = array();
	foreach ( $args['enum'] as $enum_value ) {
		$encoded_enum_values[] = is_scalar( $enum_value ) ? $enum_value : wp_json_encode( $enum_value );
	}

	if ( count( $encoded_enum_values ) === 1 ) {
		/* translators: 1: Parameter, 2: Valid values. */
		return new WP_Error( 'rest_not_in_enum', wp_sprintf( __( '%1$s is not %2$s.' ), $param, $encoded_enum_values[0] ) );
	}

	/* translators: 1: Parameter, 2: List of valid values. */
	return new WP_Error( 'rest_not_in_enum', wp_sprintf( __( '%1$s is not one of %2$l.' ), $param, $encoded_enum_values ) );
}