CODEWITHSUNDEEP
phpbinaryphp-5.3endianness
HomeCoder
HomeCoder

Reputation: 2575

How to get the endianness type in PHP?

In C# I can get the endianness type by this code snippet:

if(BitConverter.IsLittleEndian)
{
   // little-endian is used   
}
else
{
   // big-endian is used
}

How can I do the same in PHP?

Upvotes: 6

Views: 6146

Answers (2)

mpen
mpen

Reputation: 282915

function isLittleEndian() {
    return unpack('S',"\x01\x00")[1] === 1;
}

Little-endian systems store the least significant byte in the smallest (left-most) address. Thus the value 1, packed as a "short" (2-byte integer) should have its value stored in the left byte, whereas a big-endian system would store it in the right byte.

Upvotes: 8

Francis Avila
Francis Avila

Reputation: 31631

PHP's string type is an 8-bit binary string, a char sequence. It has no endianness. Thus for the most part endianness is a non-issue in PHP.

If you need to prepare binary data in a specific endianness, use the pack() and unpack() functions.

If you need to determine the machine's native endianness, you can use pack() and unpack() in the same way.

function isLittleEndian() {
    $testint = 0x00FF;
    $p = pack('S', $testint);
    return $testint===current(unpack('v', $p));
}

Upvotes: 12

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