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    <p>The best way would be to reformat the array so the keys were the directories, and the array values were arrays containing file names, like so:</p> <pre><code>$array = array( ..); $reformatted = array(); foreach( $array as $k =&gt; $v) { list( $key, $value) = explode( '|', $v); if( !isset( $reformatted[$key])) $reformatted[$key] = array(); $reformatted[$key][] = $value; } </code></pre> <p>Then you just have to iterate over the new array, like so:</p> <pre><code>foreach( $reformatted as $dir =&gt; $files) { echo $dir . "\n"; foreach( $files as $file) echo "\t" . $file . "\n"; } </code></pre> <p>This <a href="http://viper-7.com/2kXKoE" rel="nofollow">outputs</a>:</p> <pre><code>dir0 file0.txt file1.txt dir1 file2.txt filea.txt dir2 fileb.txt </code></pre> <p>Note that this will only work for plain text environment (such as <code>&lt;pre&gt;&lt;/pre&gt;</code>, like in the demo). Otherwise, you'll need to use <code>&lt;br /&gt;</code> instead of <code>\n</code> for line breaks, or use an ordered or unordered list.</p> <p><strong>For HTML output, use this,</strong> whose output can be <a href="http://viper-7.com/jBVGjX" rel="nofollow">seen here</a></p> <pre><code>echo '&lt;ul&gt;'; foreach( $reformatted as $dir =&gt; $files) { echo "&lt;li&gt;$dir&lt;/li&gt;"; echo '&lt;ul&gt;'; foreach( $files as $file) echo "&lt;li&gt;$file&lt;/li&gt;"; echo '&lt;/ul&gt;'; } echo '&lt;/ul&gt;'; </code></pre> <p>Generates: </p> <ul><li>dir0</li><ul><li>file0.txt</li><li>file1.txt</li></ul><li>dir1</li><ul><li>file2.txt</li><li>filea.txt</li></ul><li>dir2</li><ul><li>fileb.txt</li></ul></ul> <p>For your updated array, here is the solution:</p> <pre><code>$reformatted = array(); $weights = array(); foreach( $paths as $k =&gt; $v) { list( $key, $value) = explode( '|', $v[0]); if( !isset( $reformatted[$key])) $reformatted[$key] = array(); if( !isset( $weights[$key])) $weights[$key] = 0; $reformatted[$key][] = array( $value, $v[1]); $weights[$key] += $v[1]; } foreach( $reformatted as $dir =&gt; $files) { echo $dir . ' (' . $weights[$dir] . ")\n"; foreach( $files as $file) echo "\t" . $file[0] . ' (' . $file[1] . ")\n"; } </code></pre> <p>This <a href="http://viper-7.com/HFAFjX" rel="nofollow">outputs</a>:</p> <pre><code>dir0 (900) file0.txt (400) filea.txt (500) dir1 (1300) file1.txt (600) fileb.txt (700) dir2 (700) filec.txt (700) </code></pre> <p>I'll leave it up to you to translate that into HTML if necessary.</p>
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    1. COhow about if it a two dimensional array ?
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    2. COYou'd need to update your question with an example of the array.
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    3. COi have updated the question
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