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copied!<p>This is some pseudocode, but it is a start:</p> <pre><code>$strings = []; $flattenArray = function($arr, $level) use (&$strings, &$flattenArray) { foreach($arr as $key=>$value){ $s = &$strings[$level]; if(!isset($s)) { $s = array(); } $s[] = $key; if(is_array($value)) { $flattenArray($value, $level); } else { $s[] = $value; } $level ++; } }; $flattenArray($myArray, 0); foreach($strings as &$arr) { $arr = implode("||", $arr); } </code></pre> <p>Small demo with <a href="http://chat.stackoverflow.com/transcript/message/6987965#6987965">your array</a>: <a href="http://codepad.viper-7.com/CR2SPY" rel="nofollow">http://codepad.viper-7.com/CR2SPY</a> <-- It does not work fully, but it is a start</p> <hr> <h2>Update:</h2> <p>Here is a demo that I <em>think</em> works the way you want: <a href="http://codepad.viper-7.com/shN4pH" rel="nofollow">http://codepad.viper-7.com/shN4pH</a></p> <p>Code: </p> <pre><code>$strings = []; $flattenArray = function($arr, $level, $k = null) use (&$strings, &$flattenArray) { foreach($arr as $key=>$value){ if($k === null) { $s = &$strings[$key]; } else { $s = &$strings[$k]; } if(!isset($s)) { $s = array(); } $str = &$s[$level]; if(!isset($str)) { $str = array(); if($k !== null) { $str[] = $k; } } $str[] = $key; if(is_array($value)) { $flattenArray($value, $level, ($k === null) ? $key : $k); } else { $str[] = is_null($value) ? "null" : $value; } $level ++; } }; $flattenArray($myArray, 0); $all = []; foreach($strings as $k => $arr){ $new = array(); foreach($arr as $ky => $ar) { $all[] = implode("||", $ar); } } print_r($all); </code></pre>

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