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@ 2017-03-31T10:09:40Z

<?php

    function format($src, $format = '+d (ddd) ddd-dd-dd') {
        $digits = preg_replace('/\D/', '', $src); // Оставляем только цифры
        $res = '';
        for($i = 0; $i < strlen($format); $i++) {
            $letter = $format[$i];
            if (!$digits) { // Не хватило цифр
                $res .= $letter;
                continue;
            }
            switch ($letter) {
                case 'd':  // Цифра
                    $res .= $digits[0];
                    $digits = substr($digits, 1);
                    break;
                default: $res .= $letter;
            }
        }
        return $res;
    }
    
    $data = [
      '+7(999)999-99-99',
      '79998887766',
      '799988877', // недостаточно цифр для формата
    ];
    
    foreach ($data as $phoneSrc) {
        echo format($phoneSrc)."\n";
    }

Output for git.master, git.master_jit, rfc.property-hooks: +7 (999) 999-99-99 +7 (999) 888-77-66 +7 (999) 888-77-dd

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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