How to convert string to binary representation in game maker?

I found a script that converts binary to string but how can I input a string and get the binary representation? so say I put in "P" I want it to output 01010000 as a string.

I have this but it is not what I am trying to do - it converts a string containing a binary number into a real value of that number:

///string_to_binary(string)
var str = argument0;
var output = "";
for(var i = 0; i < string_length(str); i++){
if(string_char_at(str, i + 1) == "0"){
    output += "0";
}
else{
    output += "1";
}
}
return real(output);

Tip: search for GML or other language term, these questions answered many times. Also please check your tag as it is the IDE tag, not language tag.

Im not familiar with GML myself, but a quick search showed this:

At least semi-official method for exactly this: http://www.gmlscripts.com/script/bytes_to_bin

/// bytes_to_bin(str)
//
//  Returns a string of binary digits, 1 bit each.
//
//      str         raw bytes, 8 bits each, string
//
/// GMLscripts.com/license
{
    var str, bin, p, byte;
    str = argument0;
    bin = "";
    p = string_length(str);
    repeat (p) {
        byte = ord(string_char_at(str,p));
        repeat (8) {
            if (byte & 1) bin = "1" + bin else bin = "0" + bin;
            byte = byte >> 1;
        }
        p -= 1;
    }
    return bin;
}

GML forum (has several examples) https://www.reddit.com/r/gamemaker/comments/4opzhu/how_could_i_convert_a_string_to_binary/

///string_to_binary(string)
var str = argument0;
var output = "";
for(var i = 0; i < string_length(str); i++){
    if(string_char_at(str, i + 1) == "0"){
        output += "0";
    }
    else{
        output += "1";
    }
}
return real(output);

And other language examples:

C++ Fastest way to Convert String to Binary?

#include <string>
#include <bitset>
#include <iostream>
using namespace std;
int main(){
  string myString = "Hello World";
  for (std::size_t i = 0; i < myString.size(); ++i)
  {
      cout << bitset<8>(myString.c_str()[i]) << endl;
  }
}

Java: Convert A String (like testing123) To Binary In Java

  String s = "foo";
  byte[] bytes = s.getBytes();
  StringBuilder binary = new StringBuilder();
  for (byte b : bytes)
  {
     int val = b;
     for (int i = 0; i < 8; i++)
     {
        binary.append((val & 128) == 0 ? 0 : 1);
        val <<= 1;
     }
     binary.append(' ');
  }
  System.out.println("'" + s + "' to binary: " + binary);

JS: How to convert text to binary code in JavaScript?

function convert() {
  var output = document.getElementById("ti2");
  var input = document.getElementById("ti1").value;
  output.value = "";
  for (var i = 0; i < input.length; i++) {
      output.value += input[i].charCodeAt(0).toString(2) + " ";
  }
}