Online PHP editor | rfc for 5A0pD

@ 2014-04-14T14:31:05Z

<?php

function string_shift_left($input, $inputlen, $bits, &$output = null)
{
	$skip = (int) ($bits / 8);
	$copylen = (int) ($inputlen - $skip);
	$offset = ($bits % 8) & 0xff;
	$mask = ~(0xff >> (8 - $offset)) & 0xff;

    $output = str_pad('', $inputlen + 1, "\x00");

    echo "$skip $copylen $offset $mask\n";

	if ($offset == 0) {
		/* Shifting multiples of 8 allows us to simply copy the relevant bytes */
        for ($i = 0; $i < $copylen; $i++) {
            $output[$i] = $input[$i + $skip];
        }
		return;
	}

	for ($i = 0; $i < $copylen; $i++) {
        $left = (ord($input[$i + $skip]) << $offset);
        $right = (ord($input[$i + $skip + 1]) & $mask) >> $offset;
        printf("%02x ", $left | $right);
		$output[$i] = chr($left | $right); 
	}
}
//0b000100010001000100000000;

$input = "abc\x00";
$bits = 2;

string_shift_left($input, strlen($input) - 1, $bits, $output);

for ($i = 0; $i < strlen($output); $i++) {
    printf("\n%02x: %08b", ord($output[$i]), ord($output[$i]));
}

Output for git.master, git.master_jit, rfc.property-hooks: 0 3 2 252 19c 198 18c 9c: 10011100 98: 10011000 8c: 10001100 00: 00000000

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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
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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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
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