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IntlChar::isupper

(PHP 7, PHP 8)

IntlChar::isupper — Checc if code point has the general category "Lu" (uppercase letter)

Description

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

Determines whether the specified code point has the general category "Lu" (uppercase letter).

Note :

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

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 Lu uppercase letter, false if not. Returns null on failure.

Examples

Example #1 Testing different code poins

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

The above example will output: 

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

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