ctype_print

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

ctype_print — 做可打印字符检测

说明

ctype_print ( string $text ) : bool

检查提供的 string 和 text 里面的字符是不是都是可以打印出来。

参数

text

需要被测试的字符串。

返回值

如果在当前的语言环境下 text 里面的每个字符都能被实际输出（包括空白），就返回 TRUE ；如果 text 里面包含控制字符或者那些根本不会有任何输出的字符串，就返回 FALSE 。

范例

Example #1 一个 ctype_print() 例子

<?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

User Contributed Notes

ClayDragon 02-Sep-2018 09:20
As mentioned above, only ASCII characters from 32 to 126 are considered printable, all others, including UTF-8 encoded characters are always considered unprintable, no matter what your locale settings are. Therefore, e.g. German "?", the Euro sign "�" or the British pound symbol "￡" will never be printable. If you need to check any characters for "printability" beyond the standard ASCII range, use a regular expression or write a specific function yourself.

See also this discussion: https://grokbase.com/t/php/php-i18n/102tkqe6rk/ctype-print-returns-false-for-british-pound-symbol-and-non-ascii-symbols
Anonymous 12-Jun-2012 05:59
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.