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Core_Valid::alpha

Checks whether a string consists of alphabetical characters only.

boolean Core_Valid::alpha( string $str [, boolean $utf8 = bool false ] )

参数列表

参数类型描述默认值

$str string Input string

$utf8 boolean Trigger UTF-8 compatibility bool false

参数	类型	描述	默认值
`$str`	`string`	Input string
`$utf8`	`boolean`	Trigger UTF-8 compatibility	bool false

返回值

boolean

File: ./core/classes/valid.class.php

public static function alpha($str, $utf8 = false)
{
    $str = (string)$str;

    if ($utf8 === true)
    {
        return (bool)preg_match('/^\pL++$/uD', $str);
    }
    else
    {
        return ctype_alpha($str);
    }
}