ctype_cntrl

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

ctype_cntrlCheck for control character(s)

Опис

bool ctype_cntrl ( string $text )

Checks if all of the characters in the provided string, text, are control characters. Control characters are e.g. line feed, tab, escape.

Параметри

text

The tested string.

Значення, що повертаються

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

Приклади

Приклад #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";
    }
}
?>

Наведений вище приклад виведе:

The string 'string1' consists of all control characters.
The string 'string2' does not consist of all control characters.

Примітки

Зауваження:

If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.

Прогляньте Також

add a note add a note

User Contributed Notes 1 note

up
0
Tor
9 years ago
Returns true if bytes are in the range of \x00-\x1f or \x7f (del). Returns false if bytes are in the range of \x20-\x7e or \x80-\xff.
To Top