Strings

1. String Interpolation
2. If String Contains
3. String Replacement
4. Combining Strings (concatenation)
5. Grep in PHP
6. Input Validation
7. Auto-add width & height on img Elements

1. Indexed Arrays
2. Associative Arrays
3. Split a String Into an Array
4. Reordering Array Elements
5. Removing Duplicated Array Values
6. Removing Elements From Arrays
7. Check if Array is Sequential or Associative

Functions

1. Functions
2. Nested Functions
3. Named Parameters

Object Oriented PHP

1. Objects
2. Properties and Methods
3. Inheritance
4. Dependency injection
5. Namespaces
6. One Big Class vs Multiple
7. Factory Classes

Conditional Execution

1. If, Else if, Else
2. Shortened If, Else
3. Switch Statements

Looping and Recursion

1. While and For loops
2. Foreach and Array_walk
3. Foreach With Square Bracket Syntax
4. Counting to 100.000 in PHP and C++

HTTP Requests

Using stream_get_contents.

1. File: HTTP GET and Post Requests
2. File: Proxy Servers

cURL HTTP Requests

1. cURL: HTTP GET and POST Requests
2. cURL: HTTP Request Headers
3. cURL: HTTP HEAD Request
4. cURL: HTTP Response Headers
5. cURL: Proxy Servers

HTTP Server Responses

1. Sending HTTP Headers
2. Redirecting Pages

File Handling

1. Including Files in PHP
2. Create, Delete Files and Directories
3. Recursively Delete Directories
4. Rename All Files in a Directory
5. Streaming in PHP

PHP Error Handling

1. Custom Error Handler

HTML Forms

1. Catching Data From HTML Forms
2. Form Checkboxes in PHP

Configuration

1. Optimal value for PHP-FPM pm.max_children