Check if code point is a lowercase letter

# IntlChar::islower

(PHP 7, PHP 8)

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

### Description

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

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

> Note:

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

### Parameters

`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}"`)

### Return Values

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

### Examples

Example #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"));
?>`

The above example will output:

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

### See Also

- 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() - Check for lowercase character(s)

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