Checks if all of the characters in the provided string,
text, are control characters.
Control characters are e.g. line feed, tab, esc.
Список параметров
text
The tested string.
Возвращаемые значения
Returns TRUE if every character in text is
a letter from the current locale, FALSE otherwise.
Примеры
Пример 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"; } } ?>
Результат выполнения данного примера:
The string 'string1' consists of all control characters.
The string 'string2' does not consists of all control characters.