PHP5中文手册·Unpack data from binary string -- 追寻梦想＞编程乐园＞PHP 编程

说明

array unpack ( string $format , string $data )

Unpacks from a binary string into an array according to the given format .

unpack() works slightly different from Perl as the unpacked data is stored in an associative array. To accomplish this you have to name the different format codes and separate them by a slash /.

参数

format: See pack() for an explanation of the format codes.
data: The packed data.

返回值

Returns an associative array containing unpacked elements of binary string.

范例

Example#1 unpack() example


<?php
$array = unpack("c2chars/nint", $binarydata);
?>

The resulting array will contain the entries "chars1", "chars2" and "int".

注释

Caution

Note that PHP internally stores integral values as signed. If you unpack a large unsigned long and it is of the same size as PHP internally stored values the result will be a negative number even though unsigned unpacking was specified.

参见

pack()


	PHP5中文手册 uniqid usleep Misc. PHP Manual unpack (PHP 4, PHP 5) unpack — Unpack data from binary string 说明 array unpack ( string `$format` , string `$data` ) Unpacks from a binary string into an array according to the given `format` . unpack() works slightly different from Perl as the unpacked data is stored in an associative array. To accomplish this you have to name the different format codes and separate them by a slash /. 参数 `format` See pack() for an explanation of the format codes. `data` The packed data. 返回值 Returns an associative array containing unpacked elements of binary string. 范例 Example#1 unpack() example `<?php $array = unpack("c2chars/nint", $binarydata); ?>` The resulting array will contain the entries "chars1", "chars2" and "int". 注释 Caution Note that PHP internally stores integral values as signed. If you unpack a large unsigned long and it is of the same size as PHP internally stored values the result will be a negative number even though unsigned unpacking was specified. 参见 pack() uniqid usleep Misc. PHP Manual