PHP unpack() Function
 Complete PHP Misc Reference
Definition and Usage
The unpack() function unpacks data from a binary string.
This function returns an array on success, or FALSE on failure.
Syntax
| Parameter |
Description |
| format |
Required. Specifies the format to use when unpacking data.
Possible values:
- a - NUL-padded string
- A - SPACE-padded string
- h - Hex string, low nibble first
- H - Hex string, high nibble first
- c - signed char
- C - unsigned char
- s - signed short (always 16 bit, machine byte order)
- S - unsigned short (always 16 bit, machine byte order)
- n - unsigned short (always 16 bit, big endian byte order)
- v - unsigned short (always 16 bit, little endian byte order)
- i - signed integer (machine dependent size and byte order)
- I - unsigned integer (machine dependent size and byte order)
- l - signed long (always 32 bit, machine byte order)
- L - unsigned long (always 32 bit, machine byte order)
- N - unsigned long (always 32 bit, big endian byte order)
- V - unsigned long (always 32 bit, little endian byte order)
- f - float (machine dependent size and representation)
- d - double (machine dependent size and representation)
- x - NUL byte
- X - Back up one byte
- @ - NUL-fill to absolute position
|
| data |
Required. Specifies the binary data to be unpacked |
Example 1
<?php
$data = "PHP";
print_r(unpack("C*",$data));
?>
|
The output of the code above will be:
Array
(
[1] => 80
[2] => 72
[3] => 80
)
|
Example 2
<?php
$data = "PHP";
print_r(unpack("C*myint",$data));
?>
|
The output of the code above will be:
Array
(
[myint1] => 80
[myint2] => 72
[myint3] => 80
)
|
Example 3
<?php
$bin = pack("c2n2",0x1234,0x5678,65,66);
print_r(unpack("c2chars/n2int",$bin));
?>
|
The output of the code above will be:
Array
(
[chars1] => 52
[chars2] => 120
[int1] => 65
[int2] => 66
)
|
Complete PHP Misc Reference
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