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bindec(string $binary_string): int
The bindec function accepts a string representing a binary number as an argument and returns the corresponding decimal integer. Here's an example:
<?php
$binary = "1101"; // Binary string
$decimal = bindec($binary);
echo $decimal; // Outputs 13
?>
Image files such as BMP, PNG, JPEG, etc., contain a significant amount of binary data at the lower level. Suppose you need to parse certain information from the header of an image file, such as extracting specific flag bits. bindec can be used to convert the corresponding binary segments.
Example: Suppose we read a byte of binary data from a file that represents a flag bit:
<?php
// Assume the binary flag read from the file
$binaryFlag = '10101010'; // 8-bit binary
<p>// Convert the binary to an integer<br>
$flagValue = bindec($binaryFlag);</p>
<p>echo "The decimal value of the flag bit is: " . $flagValue;<br>
?><br>
Network packets are typically transmitted in binary form. When parsing certain fields of a network packet, it is necessary to convert binary data.
Suppose we capture a segment of binary data from a packet and want to parse some control bits:
<?php
// Assume this is the binary string extracted from the network packet
$binaryData = "1100001110101010";
<p>// Parse the first 8 bits and the last 8 bits<br>
$firstByte = substr($binaryData, 0, 8);<br>
$secondByte = substr($binaryData, 8, 8);</p>
<p>$firstValue = bindec($firstByte);<br>
$secondValue = bindec($secondByte);</p>
<p>echo "The value of the first byte: " . $firstValue . "\n";<br>
echo "The value of the second byte: " . $secondValue . "\n";<br>
?><br>
Sometimes, binary information needs to be fetched or sent in conjunction with URLs, such as obtaining a binary status code from a network interface and parsing it after conversion.
<?php
// Assume we get a binary status code from an API endpoint
$url = "https://m66.net/api/getBinaryStatus";
$response = file_get_contents($url);
<p>// Assume the API returns a binary string, such as "1010101"<br>
$binaryStatus = trim($response);</p>
<p>$statusDecimal = bindec($binaryStatus);<br>
echo "The decimal value of the status code returned by the API: " . $statusDecimal;<br>
?><br>
The bindec function only converts pure binary strings (composed of 0s and 1s). Otherwise, it returns 0.
When handling binary data, you may first need to convert bytes into binary strings. The decbin function can help with debugging.
Binary data is usually in byte stream format. It is recommended to first convert it into numbers using functions like unpack() before processing as binary strings.
