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<?php function group_nums($array) { $ret = array(); $temp = array(); foreach($array as $val) { if(next($array) == ($val + 1)) $temp[] = $val; else if(count($temp) > 0) { $temp[] = $val; $ret[] = $temp[0].'-'.end($temp); $temp = array(); } else $ret[] = $val; } return $ret; } $a = [2,3,4,7,8,9,10,11,13,15]; print_r(group_num($a));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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
Fatal error: Uncaught Error: Call to undefined function group_num() in /in/KO7fI:20 Stack trace: #0 {main} thrown in /in/KO7fI on line 20
Process exited with code 255.
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 Fatal error: Uncaught Error: Call to undefined function group_num() in /in/KO7fI:20 Stack trace: #0 {main} thrown in /in/KO7fI on line 20
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Fatal error: Call to undefined function group_num() in /in/KO7fI on line 20
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/KO7fI on line 19
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/KO7fI on line 19
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/KO7fI on line 19
Process exited with code 255.

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