Including files allows developers to stay organized and to reuse code instead of repeating it. Learn the differences between include, require, include_once, and require_once in this video.
- [Narrator] One useful feature in PHP…is the ability to include code from other files…into a PHP page.…It's an important feature because…it helps us to stay organized,…and to not repeat ourselves.…For example, if we define a function…that we want to use on one webpage of our site,…and we need to use it again on another page,…we don't want to copy and paste that a second time.…That would mean that we now have…two versions of the function,…and if we find a bug or we make an improvement,…we have to remember to update the code…in more than one place.…That leads to bugs and code that's hard to maintain.…
It's much better if we can put that function…in a single file, and then load it in to both PHP pages,…so that they're using the same version…of the function all the time.…And remember, that's the main reason we create functions,…is to have reusable code.…The way that we can do this in PHP…is by using the include function.…So inside our PHP tags we use include,…and then the file name that we want to include.…Functions are probably the most common thing…
Author
Kevin Skoglund
Released
6/27/2017- Organizing project files
- Including and requiring files
- Working with URL parameters
- Encoding dynamic content
- Modifying headers and page redirection
- Creating forms and processing form data
- MySQL basics
- Using PHP to access database tables
- Creating, reading, updating, and deleting database records with PHP
- Validating data
- Preventing SQL injection
Skill Level Beginner
Duration
Views
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Introduction
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Welcome48s
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1. Start a Database-Driven Project
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Blueprint the application5m 49s
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Establish your work area6m 27s
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Make page assets reusable6m 30s
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2. Build Web Pages with PHP
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Links and URLs9m 40s
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Use URL parameters8m 49s
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Encode URL parameters8m 31s
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Encode for HTML7m 18s
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Challenge: Add pages3m 26s
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Solution: Add pages7m 40s
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3. Headers and Redirects
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Modify headers8m 3s
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Page redirection7m 1s
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Output buffering6m 6s
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4. Build Forms with PHP
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Build forms8m 53s
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Use form parameters4m 22s
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Detect form submission5m 24s
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Single-page form processing6m 45s
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Challenge: Add forms2m 9s
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Solution: Add forms5m 1s
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5. MySQL Basics
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MySQL introduction6m 15s
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Create a database6m 30s
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Create a database table6m 20s
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CRUD in MySQL4m 1s
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Populate a MySQL table6m 15s
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Challenge: Pages table3m 51s
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Solution: Pages table5m 15s
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6. Use PHP to Access MySQL
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Database APIs in PHP4m 22s
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Connect to MySQL with PHP8m 56s
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Retrieve data8m 1s
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Work with retrieved data6m 50s
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Error handling6m 51s
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Challenge: List pages2m 1s
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Solution: List pages5m 6s
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7. CRUD with PHP
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Find a single record8m 22s
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Use form data to create records10m 38s
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Use form data to update records11m 24s
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Delete a record8m 23s
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Challenge: Pages CRUD3m 10s
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Solution: Pages CRUD8m 1s
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8. Validate Data with PHP
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Common data validation types9m 11s
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Validate form values8m 23s
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Display validation errors10m 11s
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Solution: Validations8m 1s
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9. Prevent SQL Injection
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Understand SQL injection5m 17s
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Sanitize data for SQL8m 57s
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Delimit data values3m 54s
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Prepared statements3m 21s
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Conclusion
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Next steps1m 8s
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Video: Include and require files