PHP Convert Ascii to Octal

Question

I'm trying to convert a string of ASCII characters to their octal equivalent and can't for the life of me figure it out. Any one know?

Mr. Llama · Accepted Answer · 2013-03-28 19:27:38Z

4

I'd just use ord and base_convert. Use ord to get the ascii value in decimal, then base_convert to make it octal.

$oct = base_convert(ord($char), 10, 8);

Here's what you seek in the form of a function:

function string_to_octal($str)
{
    $chars = str_split($str);
    $rtn = "";

    foreach ($chars as $c) { $rtn .= str_pad(base_convert(ord($c), 10, 8), 3, 0, STR_PAD_LEFT); }

    return $rtn;
}

Note: str_pad is included because the result won't always be a 3-byte chunk.
Example of the above code in action.

edit: As @brbcoding pointed out, you can use decoct($c) in place of base_convert($c, 10, 8).

edited Mar 28, 2013 at 19:27

answered Mar 28, 2013 at 19:16

Mr. Llama

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3 Comments

brbcoding Over a year ago

Could you use decoct() instead of base_convert() in this situation?

Mr. Llama Over a year ago

@brbcoding Absolutely. I wasn't aware there was a decoct function, so I fell back to the ultra-generic base_convert function.

brbcoding Over a year ago

Cool... I haven't really ever run into this issue, but was trying to figure it out too. Here's that line w/ decoct... foreach ($chars as $c) { $rtn .= decoct(ord($c)); }

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