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<?php
/**
* This file is part of the ramsey/collection library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Collection\Tool;
use DateTimeInterface;
use function assert;
use function get_resource_type;
use function is_array;
use function is_bool;
use function is_callable;
use function is_object;
use function is_resource;
use function is_scalar;
/**
* Provides functionality to express a value as string
*/
trait ValueToStringTrait
{
/**
* Returns a string representation of the value.
*
* - null value: `'NULL'`
* - boolean: `'TRUE'`, `'FALSE'`
* - array: `'Array'`
* - scalar: converted-value
* - resource: `'(type resource #number)'`
* - object with `__toString()`: result of `__toString()`
* - object DateTime: ISO 8601 date
* - object: `'(className Object)'`
* - anonymous function: same as object
*
* @param mixed $value the value to return as a string.
*/
protected function toolValueToString(mixed $value): string
{
// null
if ($value === null) {
return 'NULL';
}
// boolean constants
if (is_bool($value)) {
return $value ? 'TRUE' : 'FALSE';
}
// array
if (is_array($value)) {
return 'Array';
}
// scalar types (integer, float, string)
if (is_scalar($value)) {
return (string) $value;
}
// resource
if (is_resource($value)) {
return '(' . get_resource_type($value) . ' resource #' . (int) $value . ')';
}
// From here, $value should be an object.
assert(is_object($value));
// __toString() is implemented
if (is_callable([$value, '__toString'])) {
return (string) $value->__toString();
}
// object of type \DateTime
if ($value instanceof DateTimeInterface) {
return $value->format('c');
}
// unknown type
return '(' . $value::class . ' Object)';
}
}
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