Beginner PHP Arrays Tutorial (keys, values, const, vars, foreach)
In this tutorial, we’ll learn how arrays work in PHP. Arrays are one of the most important data structures in PHP, allowing you to store multiple values in a single variable.
Creating arrays with the [array()] keyword
Using constants and variables as array values
Automatic keys vs. manually defined keys
Mixing numeric and string keys
Using [print_r] and [var_dump] to inspect arrays
Looping through arrays with [foreach]
Testing whether keys are numeric or string with [is_numeric]
This tutorial is beginner-friendly and will give you a solid foundation for working with arrays in PHP.
⏱️ Timestamps
00:01 – Creating arrays with [array()]
01:13 – Outputting arrays using [print_r]
02:00 – Constants inside arrays (using [const])
03:14 – Variables as array values (using [$])
04:51 – Keys and values explained (index/value pairs)
05:40 – Defining keys manually in arrays
07:18 – Adding numeric values into arrays
08:00 – Out-of-order index keys allowed in PHP
09:26 – Formatting output with [pre] HTML tag
09:43 – Using strings as keys in arrays
12:16 – Inspecting arrays with [var_dump]
14:38 – Looping arrays with [foreach (key = value)]
17:14 – Detecting numeric keys with [is_numeric]
18:41 – Detecting string keys
19:55 – Understanding how PHP treats numbers vs strings in arrays
20:14 – Wrapping up and best practices
🏷️ Tags
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