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POHow can i merge arrays like a gearwheel
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  1. POHow can i merge arrays like a gearwheel
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    copied!<p>i have 3 arrays like this</p> <pre><code>$a = array( 0 =&gt; 'a1', 1 =&gt; 'a2', 2 =&gt; 'a3' ); $b = array( 0 =&gt; 'b1', 1 =&gt; 'b2', 2 =&gt; 'b3' ); $c = array( 0 =&gt; 'c1', 1 =&gt; 'c2', 2 =&gt; 'c3' ); </code></pre> <p>and i like to have somethink like this:</p> <pre><code>$r = array( 0 =&gt; 'a1', 1 =&gt; 'b1', 2 =&gt; 'c1', 3 =&gt; 'a2', 4 =&gt; 'b2', 5 =&gt; 'c2', 6 =&gt; 'a3', .... ... ); </code></pre> <p>how can i do this? and the option to use more then 3 arrays</p> <p><strong>EDIT:</strong></p> <p>i have tried this:</p> <pre><code>$a = array( 0 =&gt; 'a1', 1 =&gt; 'a2', 2 =&gt; 'a3', 3 =&gt; 'a4' ); $b = array( 0 =&gt; 'b1', 1 =&gt; 'b2', 2 =&gt; 'b3' ); $c = array( 0 =&gt; 'c1', 1 =&gt; 'c2', 2 =&gt; 'c3', 3 =&gt; 'c4', 4 =&gt; 'c5', 5 =&gt; 'c6' ); $l['a'] = count($a); $l['b'] = count($b); $l['c'] = count($c); arsort($l); $largest = key($l); $result = array(); foreach ($$largest as $key =&gt; $value) { $result[] = $a[$key]; if(array_key_exists($key, $b)) $result[] = $b[$key]; if(array_key_exists($key, $c)) $result[] = $c[$key]; } print_r($result); </code></pre> <p>Output: <code>Array ( [0] =&gt; a1 [1] =&gt; b1 [2] =&gt; c1 [3] =&gt; a2 [4] =&gt; b2 [5] =&gt; c2 [6] =&gt; a3 [7] =&gt; b3 [8] =&gt; c3 [9] =&gt; a4 [10] =&gt; c4 [11] =&gt; [12] =&gt; c5 [13] =&gt; [14] =&gt; c6 )</code></p> <p>this work.. but the code isn't nice. so anyone has a better solution?</p> <p><strong>Solution:</strong> i updated the post from @salathe with some dynamic feature</p> <pre><code>function comb(){ $arrays = func_get_args(); $result = array(); foreach (call_user_func_array(array_map, $arrays) as $column) { $values = array_filter($column, function ($a) { return $a !== null; }); $result = array_merge($result, $values); } return $result; } print_r(comb(null,$a,$b,$c,$d,....)); </code></pre> <p>Thanks to all!</p>
 

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