How to create strings by iterating over characters?

Question

PHP

How to make a script that will create a string of characters from a random iteration of the characters a-z0-9 and punctuation, and the result should be from one character. After iterating through all the options, it should add one more symbol and repeat the generation of all possible options.
I understand that this is almost brute force ready, but I’m interested from the point of view of understanding programming as such ... A complete humanist and it’s hard to understand everything ...
I understand that regular characters are set and I know how to compose, but how exactly to do what would substitute 1 - checked ( Should it store the options somewhere else or some kind of condition for for? ) - at the end of the options +1 sign (in principle, the variable and at the end of the loop increase it, but how to create a string with the number of characters = this variable?)
I found it, only returning the number of characters in the string and trimming the string to a certain number of characters, but I want to understand how to create strings
If I can explain - "for those who are in the tank" (:
ZY
Because I'm fond of Linux and I'm learning php more interested in php and bash but also other languages ​​\u200b\u200bare interesting to know if anyone knows

Answer 1

1 regular expressions here are no way sideways
they are for searching and not generating