Manual do PHP
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# ctype_cntrl

(PHP 4 >= 4.0.4, PHP 5)

ctype_cntrl -- Check for control character(s)

## Description

bool ctype_cntrl ( string text )

Returns `TRUE` if every character in text has a special control function, `FALSE` otherwise. Control characters are e.g. line feed, tab, esc.

Exemplo 1. A ctype_cntrl() example
`<?php $strings = array('string1' => "\n\r\t", 'string2' => 'arf12'); foreach ($strings as $name => $testcase) { if (ctype_cntrl($testcase)) { echo "The string '$name' consists of all control characters.\n"; } else { echo "The string '$name' does not consist of all control characters.\n"; } } ?>`
O exemplo acima irá imprimir:
    The string 'string1' consists of all control characters.
    The string 'string2' does not consists of all control characters.

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