setbased / helper-cast
Safely cast mixed values to bool, float, int, or string
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Requires
- php: >=8.1
Requires (Dev)
- phing/phing: ^3.0.0-RC4
- phpunit/phpunit: ^9.5.28
README
This package contains a strong typed utility class for safely testing and casting mixed values to bool, float, int, or string values.
Rationale
What is the purpose of this package and why is it necessary? PHP is a great language, however is has some quirks. One of them is that PHP will convert any string to an integer even when strict type is set.
The following code will not cause any error or warning (tested with PHP 7.2.12):
<?php declare(strict_types=1); ini_set('display_errors', '1'); error_reporting(E_ALL); echo '1: ', (int)'3.14', PHP_EOL; echo '2: ', (int)'123abc', PHP_EOL; echo '3: ', (int)"Ceci n'est pas une pipe.", PHP_EOL; echo '4: ', (int)'', PHP_EOL; echo '5: ', (int)null, PHP_EOL;
but gives the following output:
1: 3
2: 123
3: 0
4: 0
5: 0
This package provides a strong typed utility class for safely testing and casting mixed typed values to Boolean, float, integer, or string values.
Manual
The class SetBased\Helper\Cast
has the following methods for testing mixed values against primitive data types:
The class SetBased\Abc\Helper\Cast
has the methods shown in the table below for casting mixed values to a primitive
data type. When a value can not cast an exception will be thrown.
Remarks:
- 'opt' is short for optional:
null
values are valid. Testing and casting againstnull
yieldstrue
andnull
, respectively. - 'man' is short for mandatory:
null
values are not allowed. Testing againstnull
yieldsfalse
and castingnull
will throw an exception.
Sample
Code:
<?php declare(strict_types=1); use SetBased\Helper\Cast; $value = "Ceci n'est pas une pipe."; if (Cast::isManInt($value)) { echo 'This is not an integer', PHP_EOL; } else { echo Cast::toManInt($value), PHP_EOL; } echo Cast::toManFloat($value), PHP_EOL;
Output:
This is not an integer
Exception
Finite Floats
A float can be finite (e.g. 3.14), infinite (i.e. INF or -INF), or not a number (i.e. NAN). The
[is|to][Man|Opt]FiniteFloat
methods will assist in establishing a value is a real floating point number.
Booleans
Only and only the following values are valid representations of boolean values:
false
- int(0)
- string(1) "0"
- bool(false)
true
- int(1)
- string(1) "1"
- bool(true)
Hence, only these values can be cast safely to booleans and vice versa.
Installing
composer require setbased/helper-cast
References
- PHP RFC: Safe Casting Functions
- A functional and closer to the original RFC implementation theodorejb/PolyCast .
License
This project is licensed under the MIT license.