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File Content: `Alpha.php`

<?php

namespace PleskMonitoring\Laminas\I18n\Validator;

use PleskMonitoring\Laminas\I18n\Filter\Alpha as AlphaFilter;
use function is_string;
class Alpha extends Alnum
{
    public const INVALID = 'alphaInvalid';
    public const NOT_ALPHA = 'notAlpha';
    public const STRING_EMPTY = 'alphaStringEmpty';
    /**
     * Alphabetic filter used for validation
     *
     * @var AlphaFilter|null
     */
    protected static $filter;
    /**
     * Validation failure message template definitions
     *
     * @var string[]
     */
    protected $messageTemplates = [self::INVALID => 'Invalid type given. String expected', self::NOT_ALPHA => 'The input contains non alphabetic characters', self::STRING_EMPTY => 'The input is an empty string'];
    /**
     * Options for this validator
     *
     * @var array<string, mixed>
     */
    protected $options = ['allowWhiteSpace' => \false];
    /**
     * Returns true if and only if $value contains only alphabetic characters
     *
     * @param mixed $value
     * @return bool
     */
    public function isValid($value)
    {
        if (!is_string($value)) {
            $this->error(self::INVALID);
            return \false;
        }
        $this->setValue($value);
        if ('' === $value) {
            $this->error(self::STRING_EMPTY);
            return \false;
        }
        if (null === static::$filter) {
            static::$filter = new AlphaFilter();
        }
        static::$filter->setAllowWhiteSpace($this->getAllowWhiteSpace());
        if ($value !== static::$filter->filter($value)) {
            $this->error(self::NOT_ALPHA);
            return \false;
        }
        return \true;
    }
}

Name	Size	Permission
PhoneNumber	---	0755
Alnum.php	2947 bytes	0644
Alpha.php	1681 bytes	0644
CountryCode.php	1340 bytes	0644
DateTime.php	7368 bytes	0644
IsFloat.php	8865 bytes	0644
IsInt.php	4685 bytes	0644
PhoneNumber.php	7185 bytes	0644
PostCode.php	10135 bytes	0644

File Content: Alpha.php

File Content: `Alpha.php`