ctype_cntrl

函数原型

范例(上例将输出：)

ctype_cntrl

(PHP 4 >= 4.0.4, PHP 5)

ctype_cntrl -- 检查控制字符

函数原型

bool ctype_cntrl ( string text )

检查控制字符

范例

<?php

$strings = array('string1' => "\\\r\\t", 'string2' => 'arf12');

foreach ($strings as $name => $testcase) {

if (ctype_cntrl($testcase)) {

echo "The string '$name' consists of all control characters.\";

} else {

echo "The string '$name' does not consist of all control characters.\";

}

}

?>

上例将输出：

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