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@ 2018-10-15T11:14:02Z

<?php

$x = [
    '797734809',
    '0797734809',
    '27797734809',
    '0027797734809',
    '+27797734809',
];

function formatPhoneNo($no) {
    switch (true) {
        case (preg_match('#^7\d{8}$#', $no)):
            $no = '+27' . $no;
            break;
        case (preg_match('#^07\d{8}$#', $no)):
            $no = '+27' . substr($no, 1);
            break;
        case (preg_match('#^277\d{8}$#', $no)):
            $no = '+' . $no;
            break;
        case (preg_match('#^00277\d{8}$#', $no)):
            $no = '+' . substr($no, 2);
            break;
        case (preg_match('#^\+277\d{8}$#', $no)):
            break;
        default:
            throw new InvalidArgumentException('Invalid format supplied');
            break;
    }
    return $no;
}

foreach ($x as $y) {
    echo formatPhoneNo($y) . "\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: +27797734809 +27797734809 +27797734809 +27797734809 +27797734809

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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