Manual do PHP
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# ctype_lower

(PHP 4 >= 4.0.4, PHP 5)

ctype_lower -- Check for lowercase character(s)

## Descrição

bool ctype_lower ( string text )

Checks if all of the characters in the provided string, `text`, are lowercase letters.

## Parâmetros

`text`

  The tested string.

## Valores de retornado

Returns `TRUE` if every character in `text` is a lowercase letter in the current locale.

## Exemplos

Exemplo 1. A ctype_lower() example (using the default locale)
`<?php $strings = array('aac123', 'qiutoas', 'QASsdks'); foreach ($strings as $testcase) { if (ctype_lower($testcase)) { echo "The string $testcase consists of all lowercase letters.\n"; } else { echo "The string $testcase does not consist of all lowercase letters.\n"; } } ?>`
O exemplo acima irá imprimir:
    The string aac123 does not consist of all lowercase letters.
    The string qiutoas consists of all lowercase letters.
    The string QASsdks does not consist of all lowercase letters.

## Veja também

ctype_alpha()
ctype_upper()
setlocale()

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