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<?php $input = "PHP CODING TECH"; $counters = array_fill_keys(explode(' ', $input), 1); // ['PHP' => 1, 'CODING' => 1, 'TECH' => 1] do { $bump = true; // stop after this iteration unless more letters to output foreach ($counters as $word => &$len) { // $len is mod-by-ref for incrementing echo substr($word, 0, $len); // echo letters using $len if ($bump && isset($word[$len])) { // if no $len has been incremented during inner loop... ++$len; // increment this word's $len $bump = false; // permit outer loop to run again } } echo "\n"; // separate outputs } while (!$bump); // while still letters to output....
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.4.16, 8.5.0 - 8.5.1
PCT PHCT PHPCT PHPCOT PHPCODT PHPCODIT PHPCODINT PHPCODINGT PHPCODINGTE PHPCODINGTEC PHPCODINGTECH
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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