11110110100110110101
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It is decimal 35.
192.168.1.1
Oh, dude, the BCD number system is like that old-school friend who still uses a flip phone. The advantage is it's easy for humans to read since each decimal digit is represented by a 4-bit binary number. But the downside is it's not very efficient in terms of storage space compared to other number systems. So, like, it's great for nostalgia but not so much for modern computing efficiency.
It is called qualitative information. Also, sometimes the information can also be ordinal: this may be coded in numeric form but is not really numeric.
Without any function is impossible. So I'll assume you mean any coded function, in which case the predefined function below is your answer.$string = strrev($string);