function String_::codePointToUtf8

Converts a Unicode code point to its UTF-8 encoded representation.

Parameters

int $num Code point:

Return value

string UTF-8 representation of code point

1 call to String_::codePointToUtf8()

String_::parseEscapeSequences in vendor/nikic/php-parser/lib/PhpParser/Node/Scalar/String_.php

@internal

File

vendor/nikic/php-parser/lib/PhpParser/Node/Scalar/String_.php, line 141

Class

String_

Namespace

PhpParser\Node\Scalar

Code

private static function codePointToUtf8(int $num) : string {
    if ($num <= 0x7f) {
        return chr($num);
    }
    if ($num <= 0x7ff) {
        return chr(($num >> 6) + 0xc0) . chr(($num & 0x3f) + 0x80);
    }
    if ($num <= 0xffff) {
        return chr(($num >> 12) + 0xe0) . chr(($num >> 6 & 0x3f) + 0x80) . chr(($num & 0x3f) + 0x80);
    }
    if ($num <= 0x1fffff) {
        return chr(($num >> 18) + 0xf0) . chr(($num >> 12 & 0x3f) + 0x80) . chr(($num >> 6 & 0x3f) + 0x80) . chr(($num & 0x3f) + 0x80);
    }
    throw new Error('Invalid UTF-8 codepoint escape sequence: Codepoint too large');
}