ctype_cntrl

(PHP 4 >= 4.0.4, PHP 5)

ctype_cntrl — Check for control character(s)

说明

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.

参数

text: The tested string.

返回值

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

范例

Example#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";
    }
}
?>

上例将输出：

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

参见

ctype_print()


	PHP5中文手册 ctype_alpha ctype_digit ctype PHP Manual ctype_cntrl (PHP 4 >= 4.0.4, PHP 5) ctype_cntrl — Check for control character(s) 说明 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. 参数 `text` The tested string. 返回值 Returns `TRUE` if every character in `text` is a control character from the current locale, `FALSE` otherwise. 范例 Example#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"; } } ?>` 上例将输出： The string 'string1' consists of all control characters. The string 'string2' does not consist of all control characters. 参见 ctype_print() ctype_alpha ctype_digit ctype PHP Manual