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 以上例程会输出：
<?php
$strings = array('string1' => "
", 'string2' => 'arf12');
foreach ($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.
";
}
}
?>
The string 'string1' consists of all control characters.
The string 'string2' does not consist of all control characters.
注释
Note:
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.
参见
- ctype_print() - Check for printable character(s)
