Built-in functions in PHP

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Built-in PHP Functions

Like any other programming language, PHP offers several built-in function for day-to-day use in your coding. Most of these functions are very helpful in achieving your programming goals and are well documented.

Some (not even most) usage of built-in functions are as mentioned below:

Converting a string of letters to uppercase and lowercase
Displaying and using the date and time
Initializing and closing a database connection
Declaring and using an array
Handling files
Accessing data in forms
Filesystem Functions
Function to open FTP connections
Email related functions
Mathematical Functions
MySQL specific functions
URL Functions

For more information on built-in functions, visit the PHP website

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