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@ 2020-01-15T17:19:29Z

<?php

$string = '😀';

echo '=== UTF-8 =============================', PHP_EOL;
echo 'STRING: ', $string, PHP_EOL;
echo 'CHARACTERS: ', mb_strlen($string), PHP_EOL; // 1
echo 'BYTE COUNT: ', mb_strlen($string, '8bit'),  PHP_EOL; // 4

foreach(range(0, mb_strlen($string) - 1) as $index) {
    echo PHP_EOL;
    echo 'CHARACTER #', $index + 1, ' CODE POINT: ', '0x', dechex(mb_ord(mb_substr($string, $index, 1))), PHP_EOL; // [0x1f600]
    echo 'CHARACTER #', $index + 1, ' BYTE COUNT: ', mb_strlen(mb_substr($string, $index, 1), '8bit'), PHP_EOL; // 4
}
echo '=======================================', PHP_EOL, PHP_EOL;

$string = mb_convert_encoding($string, 'UTF-16', 'UTF-8');

echo '=== UTF-16 ============================', PHP_EOL;
echo 'STRING: ', $string, PHP_EOL;
echo 'CHARACTERS: ', mb_strlen($string), PHP_EOL; // should be 1, is 2
echo 'BYTE COUNT: ', strlen($string),  PHP_EOL; // shold be 4, is 4

foreach(range(0, mb_strlen($string) - 1) as $index) {
    echo PHP_EOL;
    echo 'CHARACTER #', $index + 1, ' CODE POINT: ', '0x', dechex(mb_ord(mb_substr($string, $index, 1))), PHP_EOL; // should be [0x1f600], is [0x0, 0x0]
    echo 'CHARACTER #', $index + 1, ' BYTE COUNT: ', mb_strlen(mb_substr($string, $index, 1), '8bit'), PHP_EOL; // should be [4], is [2, 2]
}
echo '=======================================', PHP_EOL;

Output for git.master, git.master_jit: === UTF-8 ============================= STRING: 😀 CHARACTERS: 1 BYTE COUNT: 4 CHARACTER #1 CODE POINT: 0x1f600 CHARACTER #1 BYTE COUNT: 4 ======================================= === UTF-16 ============================ STRING: �=� CHARACTERS: 2 BYTE COUNT: 4 CHARACTER #1 CODE POINT: 0x0 CHARACTER #1 BYTE COUNT: 2 CHARACTER #2 CODE POINT: 0x0 CHARACTER #2 BYTE COUNT: 2 =======================================
Output for rfc.property-hooks: === UTF-8 ============================= STRING: 😀 CHARACTERS: 1 BYTE COUNT: 4 CHARACTER #1 CODE POINT: 0x1f600 CHARACTER #1 BYTE COUNT: 4 ======================================= === UTF-16 ============================ STRING: �=� CHARACTERS: 4 BYTE COUNT: 4 CHARACTER #1 CODE POINT: 0x0 CHARACTER #1 BYTE COUNT: 2 CHARACTER #2 CODE POINT: 0x0 CHARACTER #2 BYTE COUNT: 2 CHARACTER #3 CODE POINT: 0x Fatal error: Uncaught ValueError: mb_ord(): Argument #1 ($string) must not be empty in /in/LQott:26 Stack trace: #0 /in/LQott(26): mb_ord('') #1 {main} thrown in /in/LQott on line 26
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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