How to convert text to \\x codes?

问题:

I want to convert normal text to \x codes for e.g \x14\x65\x60

For example :

normal text = "base64_decode"
converted \x codes for above text = "\x62\141\x73\145\x36\64\x5f\144\x65\143\x6f\144\x65"

How to do this? Thanks in advance.

回答1:

PHP 5.3 one-liner:

echo preg_replace_callback("/./", function($matched) {
    return '\x'.dechex(ord($matched[0]));
}, 'base64_decode');

Outputs \x62\x61\x73\x65\x36\x34\x5f\x64\x65\x63\x6f\x64\x65

回答2:

The ord() function gives you the decimal value for a single byte. dechex() converts it to hex. So to do this, loop through the every character in the string and apply both functions.

回答3:

$str = 'base64_decode';
$length = strlen($str);
$result = '';

for ($i = 0; $i < $length; $i++) $result .= '\\x'.str_pad(dechex(ord($str[$i])),2,'0',STR_PAD_LEFT);

print($result);

回答4:

Here's working code:

function make_hexcodes($text) {
    $retval = '';
    for($i = 0; $i < strlen($text); ++$i) {
        $retval .= '\x'.dechex(ord($text[$i]));
    }

    return $retval;
}

echo make_hexcodes('base64_decode');

See it in action.