Last point. could you tell me a question about getting started?

At the last point, I would like to ask a beginner question. I would like to use PHP to list all three characters consisting of 26 letters. how can I write PHP ?, PHPcode $ arr = explode ('', 'abcdefghijklmnopqrstuvwxyz '); for ($ I = 0; $ I & lt; last point, ask a getting started question
I want to use PHP to list all three characters consisting of 26 letters. what should I do with PHP?

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PHP code

$ Arr = explode ('', 'a B c d e f g h I J K L M N O P Q R S T U V W X Y Z '); for ($ I = 0; $ I <26; $ I ++) {for ($ j = 0; $ j <26; $ j ++) {for ($ k = 0; $ k <26; $ k ++) echo $ arr [$ I]. $ arr [$ j]. $ arr [$ k]."
\ N ";}}