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15 years ago
Two functions to convert 16bit or 8bit binary to integer using two's complement. If input exceeds maximum bits, false is returned. Function is easily scalable to x bits by changing the hexadecimals.

<?php function _bin16dec($bin) {
    // Function to convert 16bit binary numbers to integers using two's complement
    $num = bindec($bin);
    if($num > 0xFFFF) { return false; }
    if($num >= 0x8000) {
        return -(($num ^ 0xFFFF)+1);
    } else {
        return $num;
    }
}

function _bin8dec($bin) {
    // Function to convert 8bit binary numbers to integers using two's complement
    $num = bindec($bin);
    if($num > 0xFF) { return false; }
    if($num >= 0x80) {
        return -(($num ^ 0xFF)+1);
    } else {
        return $num;
    }
} ?>
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