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<?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 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
string(5) "apple" string(5) "tiger"
Output for 7.2.0 - 7.2.34
Parse error: syntax error, unexpected ')' in /in/rjqb1 on line 35
Process exited with code 255.

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