ctype_print

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

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int, 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_cntrl() - 做控制字符检测
ctype_graph() - 做可打印字符串检测，空格除外
ctype_punct() - 检测可打印的字符是不是不包含空白、数字和字母

User Contributed Notes

harry at upmind dot com 22-Oct-2021 02:22


You can use this function to detect if a string is "binary".



<?php

    /**

     * Determine whether the given value is a binary string by checking to see if it contains only printable characters.

     *

     * @param string $value

     *

     * @return bool

     */

    function isBinary($value): bool

    {

        // remove "unprintable" whitespace characters (tabs, newlines etc)

        $string = preg_replace('/\s/', '', (string)$value);



        return !empty($string) && !ctype_print($string);

    }

?>

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.