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<?php $str1= '082307'; echo substr(chunk_split($str1, 2, ':')); ?> - See more at: http://www.w3resource.com/php-exercises/php-string-exercises.php#sthash.bzfnf2JW.dpuf
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: substr() expects at least 2 arguments, 1 given in /in/5l9VT:3 Stack trace: #0 /in/5l9VT(3): substr('08:23:07:') #1 {main} thrown in /in/5l9VT on line 3
Process exited with code 255.

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