PHP code example of horde / constraint

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

horde / constraint example snippets

use Horde\Constraint\AllOf;
use Horde\Constraint\IsEqual;
use Horde\Constraint\PregMatch;
use Horde\Constraint\Not;
use Horde\Constraint\IsNull;

// Simple constraint
$constraint = new IsEqual('test');
$constraint->evaluate('test');  // true
$constraint->evaluate('other'); // false

// Compound constraints (AND)
$allOf = new AllOf(
    new IsEqual('admin'),
    new PregMatch('/^[a-z]+$/')
);
$allOf->evaluate('admin'); // true

// Compound constraints (OR)
$anyOf = new AnyOf(
    new IsEqual('admin'),
    new IsEqual('moderator')
);
$anyOf->evaluate('admin'); // true

// Negation
$notNull = new Not(new IsNull());
$notNull->evaluate('value'); // true
$notNull->evaluate(null);    // false

$constraint = new Horde_Constraint_IsEqual('test');
$constraint->evaluate('test'); // true

$constraint = new AllOf(
    new IsEqual('test'),
    new AlwaysTrue()
);

$constraint = new AnyOf(
    new IsEqual('foo'),
    new IsEqual('bar')
);

$constraint = new Not(new IsEqual('forbidden'));

$constraint = new IsEqual(123);
$constraint->evaluate('123'); // true (loose comparison)

$constraint = new IsInstanceOf(stdClass::class);
$constraint->evaluate(new stdClass()); // true

$constraint = new IsNull();
$constraint->evaluate(null); // true

$constraint = new PregMatch('/^\d{3}-\d{4}$/');
$constraint->evaluate('555-1234'); // true

$constraint = new AlwaysTrue();

$constraint = new AlwaysFalse();

use Horde\Constraint\{AllOf, AnyOf, Not, IsEqual, PregMatch, IsNull};

// User must be admin OR moderator, AND account must be active
$rule = new AllOf(
    new AnyOf(
        new IsEqual('admin'),
        new IsEqual('moderator')
    ),
    new IsEqual('active')
);

// Validate
$role = 'admin';
$status = 'active';
$isValid = $rule->evaluate($role) && $rule->evaluate($status);

$constraint = new AllOf(
    new IsEqual('value1'),
    new IsEqual('value2')
);

// Add more constraints dynamically
$constraint->addConstraint(new IsEqual('value3'));

// Chaining
$constraint
    ->addConstraint(new IsEqual('value4'))
    ->addConstraint(new IsEqual('value5'));

$isValidEmail = new PregMatch('/^[^@]+@[^@]+\.[^@]+$/');

$emails = ['[email protected]', 'invalid', '[email protected]'];
$validEmails = array_filter($emails, fn($email) => $isValidEmail->evaluate($email));
// Result: ['[email protected]', '[email protected]']

interface Constraint
{
    public function evaluate(mixed $value): bool;
}

$inner = new AllOf(new IsEqual(1), new IsEqual(2));
$outer = new AllOf(new IsEqual(3), $inner);
// Result: 3 constraints total (flattened), not 2 with nesting

// Before (PSR-0)
use Horde_Constraint_And;
use Horde_Constraint_PregMatch;

$constraint = new Horde_Constraint_And(
    new Horde_Constraint_PregMatch('/pattern/')
);

// After (PSR-4 - recommended)
use Horde\Constraint\AllOf;
use Horde\Constraint\PregMatch;

$constraint = new AllOf(
    new PregMatch('/pattern/')
);