Php for nested loop -

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Please explain in a broad way how this loop works in PHP? 

  ($ A = 1; $ a <10; $ a ++) {echo "& lt; br>"; For ($ b = 0; $ b & lt; $ a; $ b ++) per echo $ a; }   
 Why is production 1 22 333 4444 55555 etc and not just 1 2 3 4 5 and so on, I know that something is elementary but I can not get it.  
 Thank you.   
 
 
 key  $ a  in internal loop  
 < Code> ($ b = 0; $ b   
 It will be zero counted as  $ a  (which increases every time) in each loop and output as  $ a .  
  $ a = 0: No output (internal loop runs from 0 to 0) $ a = 1: 1 output (internal loop runs from 0 to 1) $ a = 2: 2 Output (internal loop runs from 0 to 2) $ A = 3: 3 output (internal loop runs from 0 to 3) etc. .....

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