Manual do PHP
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# ctype_alpha

(PHP 4 >= 4.0.4, PHP 5)

ctype_alpha -- Check for alphabetic character(s)

## Descrição

bool ctype_alpha ( string text )

Checks if all of the characters in the provided string, `text`, are alphabetic. In the standard `C` locale letters are just `[A-Za-z]` and ctype_alpha() is equivalent to `(ctype_upper($text) || ctype_lower($text))` if $text is just a single character, but other languages have letters that are considered neither upper nor lower case.

## Parâmetros

`text`

  The tested string.

## Valores de retornado

Returns `TRUE` if every character in `text` is a letter from the current locale, `FALSE` otherwise.

## Exemplos

Exemplo 1. A ctype_alpha() example (using the default locale)
`<?php $strings = array('KjgWZC', 'arf12'); foreach ($strings as $testcase) { if (ctype_alpha($testcase)) { echo "The string $testcase consists of all letters.\n"; } else { echo "The string $testcase does not consist of all letters.\n"; } } ?>`
O exemplo acima irá imprimir:
    The string KjgWZC consists of all letters.
    The string arf12 does not consist of all letters.

## Veja também

ctype_upper()
ctype_lower()
setlocale()

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