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<?php $sample = array('a.col1','a.col2','b.col1','c.col1','c.col2','d.col5'); foreach ($sample as $column) { [$alias, $column] = explode('.', $column, 2); $$alias[] = $column; } var_export($a); var_export($b); var_export($c); var_export($d);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'col1', 1 => 'col2', )array ( 0 => 'col1', )array ( 0 => 'col1', 1 => 'col2', )array ( 0 => 'col5', )

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