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Writing efficient PHP
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2. Writing efficient code

Using multi-dimension arrays with caution page 12 of 15

Try to avoid excessive use of arrays, especially arrays of arrays, unless you really are handling data with two or more dimensions. For example, avoid using $array[0][...] to store one set of data such as the names of the months in a year, and $array[1][...] to store another set of loosely related information, such as sales data for each month. From a performance standpoint, it is more efficient to use two arrays such as $array1[...] (storing the names of the months) and $array2[...] (storing the sales data for each month).

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