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)<?php function P(array $sources) { $result=array(); $cache=array(); foreach($sources as $node) { $cache=$result; $result=array(); foreach($node as $item) { if(empty($cache)) { $result[]=array($item); } else { foreach($cache as $line) { $line[]=$item; $result[]=$line; } } } } return $result; } $result=P(array( array('a', 'b'), array('a', 'b'), array('a', 'b'), array('a'), array('a'), array('a') )); print_r(array_map(function($a){return implode(",",$a);},$result)); echo count($result);
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
)Array ( [0] => a,a,a,a,a,a [1] => b,a,a,a,a,a [2] => a,b,a,a,a,a [3] => b,b,a,a,a,a [4] => a,a,b,a,a,a [5] => b,a,b,a,a,a [6] => a,b,b,a,a,a [7] => b,b,b,a,a,a ) 8
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] => a,a,a,a,a,a [1] => b,a,a,a,a,a [2] => a,b,a,a,a,a [3] => b,b,a,a,a,a [4] => a,a,b,a,a,a [5] => b,a,b,a,a,a [6] => a,b,b,a,a,a [7] => b,b,b,a,a,a ) 8
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/HvT5I on line 29
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/HvT5I on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/HvT5I on line 2
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
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/HvT5I on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/HvT5I on line 2
Process exited with code 255.

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