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, esc.
返回值
Returns
TRUE
if every character in
text
is
a letter from the current locale,
FALSE
otherwise.
范例
例子 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 consists of all control characters.
|
|