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<?php $blue = array(1,4,7); $red = array(2,3,5,6,8,9); $final_array = array(); $j = 0; for($i=0; $i<sizeof($blue); $i++) { $final_array[] = $blue[$i]; $r = $i*2; $p = $r+1; $final_array[] = $red[$r]; $final_array[] = $red[$p]; } echo '<pre>'; print_r($final_array);
Output for git.master, git.master_jit, rfc.property-hooks
<pre>Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 )

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