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php indexed arrays: a comprehensive tutorial

this tutorial delves into the world of indexed arrays in php, drawing inspiration from the style and structure often found in w3schools tutorials. we'll cover creation, access, manipulation, and common use cases with numerous code examples.

*what are indexed arrays?*

in php, an indexed array is an ordered map of values. each value is assigned a numerical key (index), starting from 0 by default. think of it like a numbered list where each number corresponds to a specific item. this differs from associative arrays, which use string keys instead of numeric ones.

*creating indexed arrays:*

there are several ways to create indexed arrays:

*1. using `array()`:*

this is the most common and flexible method. you can explicitly specify the keys or let php assign them automatically.



*2. using `[]` (short array syntax):*

as shown above, the short array syntax is a concise way to create arrays. it's generally preferred for readability.

*accessing array elements:*

you access individual elements using their index (key) within square brackets `[]`.



*manipulating indexed arrays:*

*1. adding elements:*

you can add elements to the end of an array using array assignment beyond the current highest index. php automatically expands the array.



*2. modifying elements:*

you can change the value of an existing element by assigning a new value to it using its index.




*3. removing elements:*

you can remove elements using `unset()`. this doesn't re-index the array.



*4. getting the array size:*

use `count()` or `sizeof()` to find the number of elements.



*5. iterating through arrays:*

use loops (e.g., `for`, `foreach`) to process array elements.



*common use cases:*

*storing lists of data:* storing a list of products, user names, or any other collection of items.
*processing data from forms:* handling multiple input fields in a form.
*working with database results:* storin ...

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