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@ 2018-08-31T12:41:19Z

<?php

$input = '20-5*2/30+9=';
$inputLength = mb_strlen($input);
$number = 0;
$result = 0;
$op = '';
for ($i = 0; $i < $inputLength; $i++) {
    $char = mb_substr($input, $i, 1);
    if ($char == '*' || $char == '+' || $char == '-' || $char == '=' || $char == '/') {
        if ($op == '') {
            $result = $number;
        } elseif ($op == '+') {
            $result += $number;
        } elseif ($op == '-') {
            $result -= $number;
        } elseif ($op == '*') {
            $result *= $number;
        } elseif ($op == '/') {
            $result /= $number;
        }
        echo "op[$op] result[$result] number[$number] char[$char] \n";
        $op = $char;
        $number = 0;
        if ($char == '=') {
            echo "Ответ: $input$result";
        }
    } elseif (is_numeric($char) || $char == '.') {
        $number = $number * 10 + intval($char);
    } else {
        echo "Неверный символ:'$char\n";
        exit();
    }
}

Output for git.master, git.master_jit, rfc.property-hooks: op[] result[20] number[20] char[-] op[-] result[15] number[5] char[*] op[*] result[30] number[2] char[/] op[/] result[1] number[30] char[+] op[+] result[10] number[9] char[=] Ответ: 20-5*2/30+9=10

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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