PHP is a general scripting language primarily used for web development purposes. PHP functions are a set of statements written in the program which can be used multiple times in the code wherever needed. To execute any statements written within a function, you need to call that function. Therefore, one can simply create a function and then call that function in the program wherever needed.
Types of PHP Functions
PHP functions can be divided into two major categories- built-in and user-defined. Each PHP function serves a distinct purpose. So let’s go through the details of each type and their examples.
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Built-in
Built-in PHP functions are also referred to as built-in library functions. As the name implies, these functions come within the installation package itself as they are a part of making the language functional and powerful. To use the function’s properties, you need to call the function when required to get the desired outcomes. There are more than 700+ built-in php functions that can be called directly to carry out a specific task.
Some of the various built-in functions used in PHP are as follows:
- String Functions: These functions are designed to work with strings and they have a predefined functionality. Various string functions in php are strpos(), strncmp(), strrev(), strlen(), etc.
- Numeric Functions: Numeric PHP functions possess a predefined logic provided by PHP and are used for numeric operations. These functions will give you results either in the form of Boolean or numerals. There are various numeric functions such as is_number(), round(), number_format() ,etc.
- Date Function: These functions have a predefined functionality in which the format is a UNIX date and time in a human-readable format.
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User-defined
User-defined PHP functions are used when the programmer wants to execute their own code logic. These functions can be defined using the keyword function, and a set of statements must be written inside the function. You can execute the function simply by calling the function. For example, functionname(), and the function will get executed.
Why should you use PHP functions?
Using functions in PHP provides the following advantages:
- Easy Error Detection: Since the code is split or divided into functions instead of writing in bulk, you can easily detect any errors and fix them right away.
- Easy modification: Usually, when functions are used in a program, you can easily modify them in the codebase, and the changes are reflected right then. Hence, PHP functions are pretty easy to maneuver and adjust.
- Multiple-area application: A function is used to reduce the lines of code to be written multiple times. If you want to use a common code in multiple areas, simply contain it in a function and call it wherever and whenever required. This also applies to calling the functions within the same program, even in different programs.
PHP functions are reliable and handy elements during the web development process. If you are looking for developers or programmers with relevant skills, Eliana provides you with top-rated freelancers. You can choose from quality developers and programmers to meet your project requirements.
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