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 Apr 12 '10 at 19:43
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do you mean convert int to float? – Mathew Apr 12 '10 at 19:46
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Example: it's bytes: 1059760811 Must be in float 0.6666667 – Valdas Apr 12 '10 at 19:52
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1059760811 is not by any definition a byte number. Bytes range from 0-255. – Arda Xi Apr 12 '10 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 Apr 12 '10 at 19:59
3 Answers
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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.
Matthew
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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
Mene
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yes php not have bytes system. but i have to make from bytes to float. it's bytes: 1059760811 > 0.6666667 (float) – Valdas Apr 12 '10 at 19:51
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out of interest, which programming language does have the *byte* variable type? – Mathew Apr 12 '10 at 19:52
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I have remade one script form java to php. it will be last task. In java it easy: Float.intBitsToFloat(integer); – Valdas Apr 12 '10 at 19:57
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1@MatW: Strangely enough, Java and C# have a byte variable type... but it's just a 1 byte unsigned number type (values 0-255). – Powerlord Apr 12 '10 at 19:59
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Valdas, that's an integet to a float. I don't get how you get 2/3rd from that integer though.. – Arda Xi Apr 12 '10 at 20:00
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Incidentally, Float.intBitsToFloat is described here: http://java.sun.com/javase/6/docs/api/java/lang/Float.html#intBitsToFloat%28int%29 – Powerlord Apr 12 '10 at 20:00
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I dont know in JAVA i checked. In php manual: For instance, 1/3 in decimal form becomes 0.3. – Valdas Apr 12 '10 at 20:02
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@OMG Unicorns Thx +1. If I could give you extra for the username, I would! – Mathew Apr 12 '10 at 20:03
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@MatW: Ha, I changed it for April Fools Day, but can't change it back until May 1st. :D – Powerlord Apr 12 '10 at 20:17
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