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(PHP 7, PHP 8)
IntlChar::isIDIgnorable — Check if code point is an ignorable character
$codepoint): ?bool
Determines if the specified character should be regarded as an ignorable character in an identifier.
true for characters with general category "Cf" (format controls) as well as non-whitespace ISO controls (U+0000..U+0008, U+000E..U+001B, U+007F..U+009F).
注意:
Note that Unicode just recommends to ignore Cf (format controls).
codepoint
The int codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
Returns true if
codepoint is ignorable in identifiers, false if not. Returns null on failure.
示例 #1 Testing different code points
<?php
var_dump(IntlChar::isIDIgnorable("A"));
var_dump(IntlChar::isIDIgnorable(" "));
var_dump(IntlChar::isIDIgnorable("\u{007F}"));
?>
以上例程会输出：
bool(false) bool(false) bool(true)
IntlChar::PROPERTY_DEFAULT_IGNORABLE_CODE_POINT