How Do You Determine the Maximum Nesting Depth of a PHP Array?

Determining Array Depth in PHP

Many PHP arrays contain embedded arrays, creating nested structures. Determining the maximum nesting depth of an array can provide insights into its complexity.

Sample Array:

$array = [
    'level1' => 'value1',
    'level2' => [
        'level3' => [
            'level4' => 'value4',
        ],
    ],
];

Finding Array Depth Using Indentation:

One approach to calculating array depth is by leveraging print_r()'s output. This function provides a hierarchical representation of the array structure:

function array_depth($array) {
    $array_str = print_r($array, true);
    $lines = explode("\n", $array_str);

    $max_indentation = 1;

    foreach ($lines as $line) {
        $indentation = (strlen($line) - strlen(ltrim($line))) / 4;
        $max_indentation = max($max_indentation, $indentation);
    }

    return ceil(($max_indentation - 1) / 2) + 1;
}

echo array_depth($array); // Output: 4

This function calculates the maximum indentation level of the array. The formula ceil(($max_indentation - 1) / 2) 1 converts the indentation levels into an array depth.

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