IntlChar::islower

(PHP 7, PHP 8)

IntlChar::islower — Check if code point is a lowercase letter

说明

public static IntlChar::islower(int|string $codepoint): ?bool

Determines whether the specified code point has the general category "Ll" (lowercase letter).

注意:
This misses some characters that are also lowercase but have a different general category value. In order to include those, use IntlChar::isULowercase().

参数

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}")

返回值

Returns true if codepoint is an Ll lowercase letter, false if not. Returns null on failure.

示例

示例 #1 Testing different code points

<?php
var_dump(IntlChar::islower("A"));
var_dump(IntlChar::islower("a"));
var_dump(IntlChar::islower("Φ"));
var_dump(IntlChar::islower("φ"));
var_dump(IntlChar::islower("1"));
?>

以上示例会输出：

bool(false)
bool(true)
bool(false)
bool(true)
bool(false)

参见

IntlChar::isupper() - Check if code point has the general category "Lu" (uppercase letter)
IntlChar::istitle() - Check if code point is a titlecase letter
IntlChar::tolower() - Make Unicode character lowercase
IntlChar::toupper() - Make Unicode character uppercase
IntlChar::PROPERTY_LOWERCASE
ctype_lower() - 检测小写字符

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