字符串到 PHP 中的字节/二进制数组
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String to byte/binary arrays in PHP
提问by Jeff Winkworth
How do I convert a string to a binary array in PHP?
如何在 PHP 中将字符串转换为二进制数组？
采纳答案by earino
回答by hdaf
Let's say that you want to convert $stringA="Hello" to binary.
假设您想将 $stringA="Hello" 转换为二进制。
First take the first character with ord() function. This will give you the ASCII value of the character which is decimal. In this case it is 72.
首先用 ord() 函数取第一个字符。这将为您提供十进制字符的 ASCII 值。在这种情况下，它是 72。
Now convert it to binary with the dec2bin() function. Then take the next function. You can find how these functions work at http://www.php.net.
现在使用 dec2bin() 函数将其转换为二进制。然后执行下一个函数。您可以在http://www.php.net 上找到这些函数的工作原理。
OR use this piece of code:
或使用这段代码：
<?php
// Call the function like this: asc2bin("text to convert");
function asc2bin($string)
{
$result = '';
$len = strlen($string);
for ($i = 0; $i < $len; $i++)
{
$result .= sprintf("%08b", ord($string{$i}));
}
return $result;
}
// If you want to test it remove the comments
//$test=asc2bin("Hello world");
//echo "Hello world ascii2bin conversion =".$test."<br/>";
//call the function like this: bin2ascii($variableWhoHoldsTheBinary)
function bin2ascii($bin)
{
$result = '';
$len = strlen($bin);
for ($i = 0; $i < $len; $i += 8)
{
$result .= chr(bindec(substr($bin, $i, 8)));
}
return $result;
}
// If you want to test it remove the comments
//$backAgain=bin2ascii($test);
//echo "Back again with bin2ascii() =".$backAgain;
?>
回答by soulmerge
There is no such thing as a binary array in PHP. All functions requiring byte streams operate on strings. What is it exactly that you want to do?
PHP 中没有二进制数组这样的东西。所有需要字节流的函数都对字符串进行操作。你到底想要做什么？
回答by McAden
If you're trying to access a specific part of a string you can treat it like an array as-is.
如果您尝试访问字符串的特定部分，您可以将其视为数组。
$foo = 'bar';
echo $foo[0];
output: b
输出：b
