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POConvert Flat PHP Array to Nested Array based on Array Keys?
 

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  1. POConvert Flat PHP Array to Nested Array based on Array Keys?
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    <p>I need to convert a flat array where the array keys indicate the structure into a nested array where the parent element becomes element zero, i.e. in the example:</p> <pre><code>$education['x[1]'] = 'Georgia Tech'; </code></pre> <p>It needs to be converted to:</p> <pre><code>$education[1][0] = 'Georgia Tech'; </code></pre> <p>Here is an example input array:</p> <pre><code>$education = array( 'x[1]' =&gt; 'Georgia Tech', 'x[1][1]' =&gt; 'Mechanical Engineering', 'x[1][2]' =&gt; 'Computer Science', 'x[2]' =&gt; 'Agnes Scott', 'x[2][1]' =&gt; 'Religious History', 'x[2][2]' =&gt; 'Women\'s Studies', 'x[3]' =&gt; 'Georgia State', 'x[3][1]' =&gt; 'Business Administration', ); </code></pre> <p>And here is what the output should be:</p> <pre><code>$education =&gt; array( 1 =&gt; array( 0 =&gt; 'Georgia Tech', 1 =&gt; array( 0 =&gt; 'Mechanical Engineering' ), 2 =&gt; array( 0 =&gt; 'Computer Science' ), ), 2 =&gt; array( 0 =&gt; 'Agnes Scott', 1 =&gt; array( 0 =&gt; 'Religious History' ), 2 =&gt; array( 0 =&gt; 'Women\'s Studies' ), ), 3 =&gt; array( 0 =&gt; 'Georgia State', 1 =&gt; array( 0 =&gt; 'Business Administration' ), ), ); </code></pre> <p>I've banged my head against the wall for hours and still can't get it working. I think I've been looking at it too long. Thanks in advance.</p> <p>P.S. It should be fully nestable, i.e. it should be able to convert a key that looks like this:</p> <pre><code>x[1][2][3][4][5][6] </code></pre> <p>P.P.S. @Joseph Silber had a clever solution but unfortunately using <code>eval()</code> is not an option for this as it's a WordPress plugin and the WordPress community is trying to stamp out the use of <code>eval()</code>.</p>
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    1. COQuite the pickle... mind if I ask how the input ends up like that...?
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      1. USPlagueEditor
    2. CO@PlaqueEditor That is how it is stored as meta_keys within wp_postmeta using a custom WordPress plugin.
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      1. USMikeSchinkel
    3. COWhen faced with a key such as `x[2][2]`, how would you know whether it's supposed to be `x[2][2] = 'whatever'` or `x[2][2][0] = 'whatever'`?
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      1. USJoseph Silber
 

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