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@ 2020-08-27T10:30:26Z

<?php
declare(strict_types=1);

function ct_select(
    bool $returnLeft,
    string $left,
    string $right
): string {
    $length = mb_strlen($left, '8bit');
    if (mb_strlen($right, '8bit') !== $length) {
        throw new Exception('ct_select() expects two strings of equal length');
    }
    
    // Mask byte
    $mask = (-$returnLeft) & 0xff;
    // X
    $x = (string) ($left ^ $right);
    
    // Output = Right XOR (X AND Mask)
    $output = '';
    for ($i = 0; $i < $length; $i++) {
        $rightCharCode = unpack('C', $right[$i])[1];
        $xCharCode = unpack('C', $x[$i])[1];
        $output .= pack(
            'C',
            $rightCharCode ^ ($xCharCode & $mask)
        );
    }
    return $output;
}

var_dump(
    ct_select(true, 'apple', 'tiger'),
    ct_select(false, 'apple', 'tiger'),
);

Output for git.master, git.master_jit, rfc.property-hooks: string(5) "apple" string(5) "tiger"

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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