Online PHP editor | output for 40D8F

<?php ////////////////////////////////////////////////////////////////// // // This is not a difficult test, but it will test your ability to // read and write code as it might exist within our application. // // This should take less than 30 minutes. // // Good luck! // ////////////////////////////////////////////////////////////////// // Part One: Reading ////////////////////////////// // Your challenge here is to figure out what this code does. // Please change the variable names to something more appropriate, // and also comment it to the best of your ability. $s = 'typewriter'; $t = array( ); $a = str_split( $s ); $o = array( ); $o['a'] = array( 'q', 'w', 'z', 'x' ); $o['b'] = array( 'v', 'f', 'g', 'h', 'n' ); $o['c'] = array( 'x', 's', 'd', 'f', 'v' ); $o['d'] = array( 'x', 's', 'w', 'e', 'r', 'f', 'v', 'c' ); $o['e'] = array( 'w', 's', 'd', 'f', 'r' ); $o['f'] = array( 'c', 'd', 'e', 'r', 't', 'g', 'b', 'v' ); $o['g'] = array( 'r', 'f', 'v', 't', 'b', 'y', 'h', 'n' ); $o['h'] = array( 'b', 'g', 't', 'y', 'u', 'j', 'm', 'n' ); $o['i'] = array( 'u', 'j', 'k', 'l', 'o' ); $o['j'] = array( 'n', 'h', 'y', 'u', 'i', 'k', 'm' ); $o['k'] = array( 'u', 'j', 'm', 'l', 'o' ); $o['l'] = array( 'p', 'o', 'i', 'k', 'm' ); $o['m'] = array( 'n', 'h', 'j', 'k', 'l' ); $o['n'] = array( 'b', 'g', 'h', 'j', 'm' ); $o['o'] = array( 'i', 'k', 'l', 'p' ); $o['p'] = array( 'o', 'l' ); $o['r'] = array( 'e', 'd', 'f', 'g', 't' ); $o['s'] = array( 'q', 'w', 'e', 'z', 'x', 'c' ); $o['t'] = array( 'r', 'f', 'g', 'h', 'y' ); $o['u'] = array( 'y', 'h', 'j', 'k', 'i' ); $o['v'] = array( '', 'c', 'd', 'f', 'g', 'b' ); $o['w'] = array( 'q', 'a', 's', 'd', 'e' ); $o['x'] = array( 'z', 'a', 's', 'd', 'c' ); $o['y'] = array( 't', 'g', 'h', 'j', 'u' ); $o['z'] = array( 'x', 's', 'a' ); $o['1'] = array( 'q', 'w' ); $o['2'] = array( 'q', 'w', 'e' ); $o['3'] = array( 'w', 'e', 'r' ); $o['4'] = array( 'e', 'r', 't' ); $o['5'] = array( 'r', 't', 'y' ); $o['6'] = array( 't', 'y', 'u' ); $o['7'] = array( 'y', 'u', 'i' ); $o['8'] = array( 'u', 'i', 'o' ); $o['9'] = array( 'i', 'o', 'p' ); $o['0'] = array( 'o', 'p' ); foreach( $a as $key => $value ) { $u = $a; echo "Key: $key, value $value"; } foreach( $a as $key => $value ) { $u = $a; foreach( $o[$value] as $p ) { $u[$key] = $p; $t[] = join( "", $u ); } } print_r( $t ); foreach( $a as $key => $value ) { $u = $a; echo "" } ?>