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<?php var_export(preg_split('~.{3}\K~', 'abcdefghijklm', 3)); echo "\n---\n"; var_export([preg_replace('~.{3}\K~','*', 'abcdefghijklm', 3, $count1), $count1]); echo "\n---\n"; var_export([preg_filter('~.{3}\K~', '*', 'abcdefghijklm', 3, $count2), $count2]); echo "\n---\n"; var_export(preg_grep('~.{3}\K~', ['abcdef', 'ghijklm'])); echo "\n---\n"; var_export(preg_match_all('~(.{3})\K~', 'abcdefghijklm', $m1) ? $m1 : null); echo "\n---\n"; var_export(preg_match_all('~.{3}\K~', 'abcdefghijklm', $m2) ? $m2 : null); echo "\n---\n"; var_export([preg_replace_callback('~.{3}\K~', function() { return '*'; }, 'abcdefghijklm', 3, $count3), $count3]);
Output for 7.4.20 - 7.4.33, 8.0.5 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array ( 0 => 'abc', 1 => 'def', 2 => 'ghijklm', ) --- array ( 0 => 'abc*def*ghi*jklm', 1 => 3, ) --- array ( 0 => 'abc*def*ghi*jklm', 1 => 3, ) --- array ( 0 => 'abcdef', 1 => 'ghijklm', ) --- array ( 0 => array ( 0 => '', 1 => '', 2 => '', 3 => '', ), 1 => array ( 0 => 'abc', 1 => 'def', 2 => 'ghi', 3 => 'jkl', ), ) --- array ( 0 => array ( 0 => '', 1 => '', 2 => '', 3 => '', ), ) --- array ( 0 => 'abc*def*ghi*jklm', 1 => 3, )
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.16, 8.0.0 - 8.0.3
array ( 0 => 'abc', 1 => 'def', 2 => 'ghi', 3 => 'jkl', 4 => 'm', ) --- array ( 0 => 'abc*def*ghi*jklm', 1 => 3, ) --- array ( 0 => 'abc*def*ghi*jklm', 1 => 3, ) --- array ( 0 => 'abcdef', 1 => 'ghijklm', ) --- array ( 0 => array ( 0 => '', 1 => '', 2 => '', 3 => '', ), 1 => array ( 0 => 'abc', 1 => 'def', 2 => 'ghi', 3 => 'jkl', ), ) --- array ( 0 => array ( 0 => '', 1 => '', 2 => '', 3 => '', ), ) --- array ( 0 => 'abc*def*ghi*jklm', 1 => 3, )

preferences:
125.16 ms | 403 KiB | 149 Q