Returns true if bytes are in the range of \x00-\x1f or \x7f (del). Returns false if bytes are in the range of \x20-\x7e or \x80-\xff.
ctype_cntrl
(PHP 4 >= 4.0.4, PHP 5)
ctype_cntrl — Check for control character(s)
說明
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.
參數
-
text -
The tested string.
回傳值
Returns TRUE if every character in text is
a control character from the current locale, FALSE otherwise.
範例
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";
}
}
?>
上例將輸出：
The string 'string1' consists of all control characters. The string 'string2' does not consist of all control characters.
註釋
Note:
如果給出一個 -128 到 255 之間(含)的整數, 將會被解釋為該值對應的ASCII字元 (負值將加上 256 以支援擴展ASCII字元)。 其它整數將會被解釋為該值對應的十進位字串.
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