Php str to byte

How to Get the Byte Values of a String in PHP

How can I get the single bytes from a multibyte PHP string variable in a binary-safe way?

you can get a bytearray by unpacking the utf8_encoded string $a:

$a = utf8_encode('Fön');
$b = unpack('C*', $a); 
var_dump($b);

used format C* for «unsigned char»

• String to byte array in php
• http://www.php.net/manual/en/function.unpack.php
• http://www.php.net/manual/en/function.pack.php

String to byte array in php

@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)

PHP Read Byte Range from String or File

You should be able to do this with fseek and fread .

$byteOffset = 1024;
$readLength = 256;
$fileHandle = fopen('myfile', 'r');
fseek($fileHandle, $byteOffset);
$bytes = fread($fileHandle, $readLength);

String to byte/binary arrays in PHP

I think you are asking for the equivalent to the Perl pack/unpack functions. If that is the case, I suggest you look at the PHP pack/unpack functions:

How can I convert array of bytes to a string in PHP?

If by array of bytes you mean:

$bytes = array(255, 0, 55, 42, 17, );

array_map()

$string = implode(array_map("chr", $bytes));

foreach()

Which is the compact version of:

$string = "";
foreach ($bytes as $chr) $string .= chr($chr);
>
// Might be a bit speedier due to not constructing a temporary array.

pack()

But the most advisable alternative could be to use pack(«C*», [$array. ]) , even though it requires a funky array workaround in PHP to pass the integer list:

$str = call_user_func_array("pack", array_merge(array("C*"), $bytes)));

That construct is also more useful if you might need to switch from bytes C* (for ASCII strings) to words S* (for UCS2) or even have a list of 32bit integers L* (e.g. a UCS4 Unicode string).

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Строка в байтовый массив в php

Как я могу получить массив байтов из некоторой строки, которая может содержать числа, буквы и т. Д.? Если вы знакомы с Java, я ищу ту же функциональность метода getBytes ().

Я попробовал такой сниппет:

но безуспешно, поэтому любая помощь будет оценена по достоинству.

PS: Зачем мне это вообще ?? Ну, мне нужно отправить массив байтов через fputs () на сервер, написанный на Java …

@Sparr прав, но я предполагаю, что вы ожидали массив byte[] например byte[] в C #. Это то же самое решение, что и Sparr, но вместо HEX вы ожидали int presentation ( диапазон от 0 до 255 ) каждого char . Вы можете сделать следующее:

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

Используя var_dump вы можете видеть, что элементы являются 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) > 

print_r(unpack("H*","The quick fox jumped over the lazy brown dog")) Array ( [1] => 54686520717569636b20666f78206a756d706564206f76657220746865206c617a792062726f776e20646f67 ) 

При необходимости вы можете разделить результат на два столбца с шестнадцатеричным символом.

Вы можете попробовать следующее:

$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); 

В PHP строки – это потоки. Что именно ты пытаешься сделать?

Ps. Зачем мне это вообще ?? Ну, мне нужно отправить через fputs () bytearray на сервер, написанный в java …

fputs принимает строку в качестве аргумента. Скорее всего, вам просто нужно передать свою строку. На стороне Java вещи вы должны декодировать данные в любой кодировке, которую вы используете в php (по умолчанию iso-8859-1).

PHP не имеет явного типа byte , но его string уже является эквивалентом массива байтов Java. Вы можете безопасно писать fputs($connection, «The quick brown fox …») . Единственное, что вы должны знать, это кодирование символов, они должны быть одинаковыми с обеих сторон. Используйте mb_convert_encoding (), когда вы сомневаетесь.

Я нашел несколько функций, определенных в http://tw1.php.net/unpack , очень полезными.
Они могут скрывать строку в байтовый массив и наоборот.

Возьмите byteStr2byteArray () в качестве примера:

 $msg = "abcdefghijk"; $byte_array = byteStr2byteArray($msg); for($i=0;$i ?> 

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[php] String to byte array in php

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:

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.

This question is related to php bytearray

The answer is

@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)

print_r(unpack("H*","The quick fox jumped over the lazy brown dog")) Array ( [1] => 54686520717569636b20666f78206a756d706564206f76657220746865206c617a792062726f776e20646f67 ) 

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

$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); 

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.

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

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).

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:

 $msg = "abcdefghijk"; $byte_array = byteStr2byteArray($msg); for($i=0;$i ?> 

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String to byte/binary arrays in PHP

I think you are asking for the equivalent to the Perl pack/unpack functions. If that is the case, I suggest you look at the PHP pack/unpack functions:

If you’re trying to access a specific part of a string you can treat it like an array as-is.

For this kind of string access, I believe curly brace notation is preferable (otherwise you risk confusing the hell out of anyone else maintaining your code). For example: $foo

Ah, here it is: us.php.net/language.types.string The «Note» under the heading — «String access and modification by character»

@EvanK: for any kind of access, I believe square brace notation is preferable (otherwise you risk confusing the hell out of anyone else maintaining your code). For example avoid: $foo

There is no such thing as a binary array in PHP. All functions requiring byte streams operate on strings. What is it exactly that you want to do?

Let’s say that you want to convert $stringA=»Hello» to binary.

First take the first character with ord() function. This will give you the ASCII value of the character which is decimal. In this case it is 72.

Now convert it to binary with the dec2bin() function. Then take the next function. You can find how these functions work at http://www.php.net.

OR use this piece of code:

)); > return $result; > // If you want to test it remove the comments //$test=asc2bin(«Hello world»); //echo «Hello world ascii2bin conversion =».$test.»
«; //call the function like this: bin2ascii($variableWhoHoldsTheBinary) function bin2ascii($bin) < $result = ''; $len = strlen($bin); for ($i = 0; $i < $len; $i += 8) < $result .= chr(bindec(substr($bin, $i, 8))); >return $result; > // If you want to test it remove the comments //$backAgain=bin2ascii($test); //echo «Back again with bin2ascii() mt24″>

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String to byte array in php

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:

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.

6 Answers 6

@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)

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