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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 git.master, git.master_jit, rfc.property-hooks
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, )

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