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PHP Quiz PHP CertificatePHP 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
unpack(format,data)
| Parameter | Description |
|---|---|
| format | Required. Specifies the format to use when unpacking data. Possible values:
|
| data | Required. Specifies the binary data to be unpacked |
Example 1
<?php
$data = "PHP";
print_r(unpack("C*",$data));
?>
$data = "PHP";
print_r(unpack("C*",$data));
?>
The output of the code above will be:
Array
(
[1] => 80
[2] => 72
[3] => 80
)
(
[1] => 80
[2] => 72
[3] => 80
)
Example 2
<?php
$data = "PHP";
print_r(unpack("C*myint",$data));
?>
$data = "PHP";
print_r(unpack("C*myint",$data));
?>
The output of the code above will be:
Array
(
[myint1] => 80
[myint2] => 72
[myint3] => 80
)
(
[myint1] => 80
[myint2] => 72
[myint3] => 80
)
Example 3
<?php
$bin = pack("c2n2",0x1234,0x5678,65,66);
print_r(unpack("c2chars/n2int",$bin));
?>
$bin = pack("c2n2",0x1234,0x5678,65,66);
print_r(unpack("c2chars/n2int",$bin));
?>
The output of the code above will be:
Array
(
[chars1] => 52
[chars2] => 120
[int1] => 65
[int2] => 66
)
(
[chars1] => 52
[chars2] => 120
[int1] => 65
[int2] => 66
)
Complete PHP Misc Reference
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