Examples

Types

Description

isValid() asks the same question as assert() without throwing, so it can be used in a condition. It checks the value as it is: '42' is not an integer, and JSON text is not json until cast() turns it into a Json value.

Documentation

Types describe a value: they assert it, cast it, or answer whether it fits.

Building Blocks

Code

<?php

declare(strict_types=1);

use function Flow\Types\DSL\{type_integer, type_json};

require __DIR__ . '/vendor/autoload.php';

// isValid() answers the same question as assert(), without throwing
foreach ([42, '42', 3.14] as $value) {
    echo var_export($value, true) . ' is integer: ' . (type_integer()->isValid($value) ? 'yes' : 'no') . "\n";
}

// json is a value object: JSON text is only a string until cast() turns it into one
$text = '{"name":"John"}';

echo var_export($text, true) . ' is json: ' . (type_json()->isValid($text) ? 'yes' : 'no') . "\n";
echo 'type_json()->cast(' . var_export($text, true) . ') is json: ' . (type_json()->isValid(type_json()->cast($text)) ? 'yes' : 'no') . "\n";

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