How can I convert from bytes to float in php? Like in Java
int i = (byte3 & 0xff) << 24 | (byte2 & 0xff) << 16 | (byte1 & 0xff) << 8 | byte0 & 0xff;
Float.intBitsToFloat(i);
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Can you give an example of how you expect that bytes are converted to float?Gumbo– Gumbo2010-04-12 19:43:12 +00:00Commented Apr 12, 2010 at 19:43
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do you mean convert int to float?Mathew– Mathew2010-04-12 19:46:37 +00:00Commented Apr 12, 2010 at 19:46
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Example: it's bytes: 1059760811 Must be in float 0.6666667Valdas– Valdas2010-04-12 19:52:39 +00:00Commented Apr 12, 2010 at 19:52
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1059760811 is not by any definition a byte number. Bytes range from 0-255.Arda Xi– Arda Xi2010-04-12 19:55:47 +00:00Commented Apr 12, 2010 at 19:55
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How can i remade: int i = (byte3 & 0xff) << 24 | (byte2 & 0xff) << 16 | (byte1 & 0xff) << 8 | byte0 & 0xff; Float.intBitsToFloat(i);Valdas– Valdas2010-04-12 19:59:36 +00:00Commented Apr 12, 2010 at 19:59
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3 Answers
There may be a more direct way, but here you go:
<?php
var_dump(unpack('f', pack('i', 1059760811)));
?>
This is, of course, machine dependent, but I don't know of any machine running PHP that doesn't use IEEE 754 floats.
Comments
I don't think php has bytes, does it? When you assign a number to a variable you'll get an variable with a number type
$a = 10; // integer
$f = 1.0; // double
$b = $a + $f; // $b is double
10 Comments
Valdas
yes php not have bytes system. but i have to make from bytes to float. it's bytes: 1059760811 > 0.6666667 (float)
Mathew
out of interest, which programming language does have the byte variable type?
Valdas
I have remade one script form java to php. it will be last task. In java it easy: Float.intBitsToFloat(integer);
Powerlord
@MatW: Strangely enough, Java and C# have a byte variable type... but it's just a 1 byte unsigned number type (values 0-255).
Arda Xi
Valdas, that's an integet to a float. I don't get how you get 2/3rd from that integer though..
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If I'm understanding you correctly, you want to take a raw 32- or 64-bit "integer" value, and force that set of bits to treated as a floating point number instead?
