How to Append Elements to Multidimensional Arrays Using Different Sub-Array Structures in PHP?

Appending to Multidimensional Arrays Using array_push

Problem

Given a multidimensional array with sub-arrays recipe_type and cuisine, how do you append new elements to them using the array_push function?

Solution

For Appending to recipe_type:

To add elements to the recipe_type sub-array while maintaining its sequential index, use the following syntax:

<code class="php">$newdata = [
    'wpseo_title' => 'test',
    'wpseo_desc' => 'test',
    'wpseo_metakey' => 'test'
];

$recipe_type[] = $newdata;</code>

For Appending to cuisine:

Alternatively, for the cuisine sub-array, which also has sequential indices, you can use array_push directly:

<code class="php">array_push($cuisine, $newdata);</code>

Associative Sub-Array Considerations

Note that the wpseo_title, wpseo_desc, and wpseo_metakey keys in the $newdata array are associative. You can only append to associative sub-arrays by directly manipulating the array, as in the first example for $recipe_type.

Example

Using the provided multidimensional array $md_array, here's how to add a new element to recipe_type:

<code class="php">$md_array['recipe_type'][] = [
    'wpseo_title' => 'test',
    'wpseo_desc' => 'test',
    'wpseo_metakey' => 'test'
];</code>

Conclusion

By using the appropriate method of adding elements, you can effectively extend multidimensional arrays with new data, regardless of the sub-arrays' index structure.

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