ctype_lower
when a string has german umlauts in it, this function will return FALSE
ctype_print
(PHP 4 >= 4.0.4, PHP 5)
ctype_print — Check for printable character(s)
说明
bool ctype_print
( string $text
)
Checks if all of the characters in the provided string, text , are printable.
参数
- text
-
The tested string.
返回值
Returns TRUE if every character in text will actually create output (including blanks). Returns FALSE if text contains control characters or characters that do not have any output or control function at all.
范例
Example#1 A ctype_print() example
<?php
$strings = array('string1' => "asdf\n\r\t", 'string2' => 'arf12', 'string3' => 'LKA#@%.54');
foreach ($strings as $name => $testcase) {
if (ctype_print($testcase)) {
echo "The string '$name' consists of all printable characters.\n";
} else {
echo "The string '$name' does not consist of all printable characters.\n";
}
}
?>
上例将输出：
The string 'string1' does not consist of all printable characters. The string 'string2' consists of all printable characters. The string 'string3' consists of all printable characters.
add a note
User Contributed Notesctype_print
flatline at greyhat dot nl
04-Mar-2004 08:58
04-Mar-2004 08:58
It seems that this function does not recognize characters such as '', '', '', '' as printable.
Depends on your locale settings, in the default "C" locale they are
indeed not printable as it is 7bit ASCII based. (hartmut)