Hướng dẫn check byte string php

Say I have a string in php, that prints out to a text file like this:

nÖ§9q1Fª£

How do I get the byte codes of this to my text file rather than the funky ascii characters?

asked Feb 26, 2009 at 17:00

Use the ord function

http://ca.php.net/ord

eg.

";
}
?>

answered Feb 26, 2009 at 17:03

GautamGautam

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If You wish to get the string as an array of integer codes, there's a nice one-liner:

unpack('C*', $string)

Beware, the resulting array is indexed from 1, not from 0!

answered Mar 21, 2014 at 14:28

Roman HockeRoman Hocke

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If you are talking about the hex value, this should do for you:

$value = unpack('H*', "Stack");
echo $value[1];

Reference

answered Apr 18, 2013 at 10:26

AdeeAdee

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Ord() does the trick with an ASCII-charset. If you, however, meddle with multibyte strings (like UTF-8), you're out of luck, and need to hack it yourself.

answered Feb 26, 2009 at 17:06

Henrik PaulHenrik Paul

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(PHP 4 >= 4.4.3, PHP 5 >= 5.1.3, PHP 7, PHP 8)

mb_check_encoding — Check if strings are valid for the specified encoding

Description

mb_check_encoding(array|string|null $value = null, ?string $encoding = null): bool

Parameters

The byte stream or array to check. If it is omitted, this function checks all the input from the beginning of the request.

Warning

As of PHP 8.1.0, omitting this parameter or passing null is deprecated.

The expected encoding.

Return Values

Returns true on success or false on failure.

Changelog

How can I get the byte array from some string which can contain numbers, letters and so on? If you are familiar with Java, I am looking for the same functionality of the getBytes() method.

I tried a snippet like this one:

for($i = 0; $i < strlen($msg); $i++){
    $data.=ord($msg[$i]);
        //or $data[]=ord($msg[$1]); 
}

but without success, so any kind of help will be appreciated.

PS: Why do I need this at all!? Well, I need to send a byte array via fputs() to a server written in Java...

dokaspar

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asked May 19, 2009 at 23:49

@Sparr is right, but I guess you expected byte array like byte[] in C#. It's the same solution as Sparr did but instead of HEX you expected int presentation (range from 0 to 255) of each char. You can do as follows:

$byte_array = unpack('C*', 'The quick fox jumped over the lazy brown dog');
var_dump($byte_array);  // $byte_array should be int[] which can be converted
                        // to byte[] in C# since values are range of 0 - 255

By using var_dump you can see that elements are int (not string).

   array(44) {  [1]=>  int(84)  [2]=>  int(104) [3]=>  int(101) [4]=>  int(32)
[5]=> int(113)  [6]=>  int(117) [7]=>  int(105) [8]=>  int(99)  [9]=>  int(107)
[10]=> int(32)  [11]=> int(102) [12]=> int(111) [13]=> int(120) [14]=> int(32)
[15]=> int(106) [16]=> int(117) [17]=> int(109) [18]=> int(112) [19]=> int(101)
[20]=> int(100) [21]=> int(32)  [22]=> int(111) [23]=> int(118) [24]=> int(101)
[25]=> int(114) [26]=> int(32)  [27]=> int(116) [28]=> int(104) [29]=> int(101)
[30]=> int(32)  [31]=> int(108) [32]=> int(97)  [33]=> int(122) [34]=> int(121)
[35]=> int(32)  [36]=> int(98)  [37]=> int(114) [38]=> int(111) [39]=> int(119)
[40]=> int(110) [41]=> int(32)  [42]=> int(100) [43]=> int(111) [44]=> int(103) }

Be careful: the output array is of 1-based index (as it was pointed out in the comment)

answered Jul 13, 2012 at 8:22

BronekBronek

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print_r(unpack("H*","The quick fox jumped over the lazy brown dog"))

Array ( [1] => 54686520717569636b20666f78206a756d706564206f76657220746865206c617a792062726f776e20646f67 ) 

T = 0x54, h = 0x68, ...

You can split the result into two-hex-character chunks if necessary.

answered May 20, 2009 at 0:29

SparrSparr

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PHP has no explicit byte type, but its string is already the equivalent of Java's byte array. You can safely write fputs($connection, "The quick brown fox …"). The only thing you must be aware of is character encoding, they must be the same on both sides. Use mb_convert_encoding() when in doubt.

answered Jul 13, 2011 at 11:48

soulmergesoulmerge

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You could try this:

$in_str = 'this is a test';
$hex_ary = array();
foreach (str_split($in_str) as $chr) {
    $hex_ary[] = sprintf("%02X", ord($chr));
}
echo implode(' ',$hex_ary);

answered May 19, 2009 at 23:59

karim79karim79

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In PHP, strings are bytestreams. What exactly are you trying to do?

Re: edit

Ps. Why do I need this at all!? Well I need to send via fputs() bytearray to server written in java...

fputs takes a string as argument. Most likely, you just need to pass your string to it. On the Java side of things, you should decode the data in whatever encoding, you're using in php (the default is iso-8859-1).

answered Jun 24, 2009 at 20:30

troelskntroelskn

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I found several functions defined in http://tw1.php.net/unpack are very useful.
They can covert string to byte array and vice versa.

Take byteStr2byteArray() as an example:

answered Feb 13, 2014 at 5:53

1