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<?php $input = '1_2_3_4_5'; // Get an array with 1, 2, 3, 4 and 5 $parts = explode('_', $input); $output = []; $i = 1; foreach ($parts as $part) { // array_slice() will take 1 to n elements from the array of numbers $values = array_slice($parts, 0, $i++); // Join the values $output[] = implode('_', $values); } print_r($output);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Array ( [0] => 1 [1] => 1_2 [2] => 1_2_3 [3] => 1_2_3_4 [4] => 1_2_3_4_5 )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [0] => 1 [1] => 1_2 [2] => 1_2_3 [3] => 1_2_3_4 [4] => 1_2_3_4_5 )
preferences:
152.74 ms | 402 KiB | 156 Q