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.
ctype_print
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_print — 印字可能な文字かどうかを調べる
パラメータ
-
text -
調べる文字列。
注意:
-128 から 255 までの int を渡すと、ひとつの文字の ASCII 値とみなします (負の値には 256 を足して、拡張 ASCII の範囲に収まるようにします)。 それ以外の整数値は、10 進数を含む文字列とみなします。
返り値
text のすべての文字が（空白を含めて）実際に
出力を行う場合に true 、text に制御文字
またはまったく出力も制御も行わない文字が含まれる場合に false
を返します。
例
例1 ctype_print() の例
<?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";
}
}
?>
上の例の出力は以下となります。
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.
参考
- ctype_cntrl() - 制御文字かどうかを調べる
- ctype_graph() - 空白以外の印字可能な文字かどうかを調べる
- ctype_punct() - 空白、英数字以外の出力可能な文字かどうかを調べる
add a note
User Contributed Notes 2 notes
Anonymous ¶
11 years ago
ClayDragon ¶
5 years ago
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 "ä", 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
