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<?php $string = 'ADJKANKNAKLNKALNFKLANFKLNAKLFNKALN'; [$first5, $string] = preg_split('~.{5}\K~', $string, 2); var_export([$first5, $string]);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'ADJKA', 1 => 'NKNAKLNKALNFKLANFKLNAKLFNKALN', )

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