Ctype 函数
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ctype_print

(PHP 4 >= 4.0.4, PHP 5)

ctype_printCheck 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";
    }
}
?>

以上例程会输出:

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.

注释

Note:

如果给出一个 -128 到 255 之间(含)的整数, 将会被解释为该值对应的ASCII字符 (负值将加上 256 以支持扩展ASCII字符). 其它整数将会被解释为该值对应的十进制字符串.

参见


Ctype 函数
在线手册:中文  英文

用户评论:

Anonymous (2012-06-12 17:59:41)

Only ascii 32 thru 126 (inclusive) are considered printable. Tab (ascii 7), carriage return (ascii 13), linefeed (ascii 10) etc may produce output but are not considered printable.

flatline at greyhat dot nl (2004-03-03 16:58:32)

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