(PHP 7)
IntlChar::isprint — Check if code point is a printable character
Determines whether the specified code point is a printable character.
TRUE for general categories other than "C" (controls).
Returns TRUE if
codepoint is a printable character, FALSE if not.
Example #1 Testing different code points
<?php
var_dump(IntlChar::isprint("A"));
var_dump(IntlChar::isprint(" "));
var_dump(IntlChar::isprint("\n"));
var_dump(IntlChar::isprint("\u{200e}"));
?>
以上例程会输出：
bool(true) bool(true) bool(false) bool(false)
IntlChar::PROPERTY_DEFAULT_IGNORABLE_CODE_POINT