Parsing the unpack() function in php (with code example)

There is a relatively rarely used function unpack() function. Its function is to unpack data from a binary string. This article will take you through it. Take a look, the first thing you need to understand is its syntax:

unpack($format,$data)

• $format: required. Specifies the format to use when unpacking data

• $data: Optional. Specifies the binary data to be unpacked.

• Return value: Unpack data from binary string

Code example:

<?php
//首先使用pack打包
$string = pack(&#39;L4&#39;, 1, 2, 3, 4);
var_dump(unpack(&#39;L4&#39;, $string));
//输出:
?>

输出：
     array(4) { [1]=> int(1) [2]=> int(2) [3]=> int(3) [4]=> int(4) }

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