Php call function with parameters in array

Php call function with parameters in array

Posted: original Date of post: 08.07.2017

In this tutorial you will learn how to create your own custom functions in PHP.

php call function with parameters in array

Please check out PHP reference section for a complete list of useful PHP built-in functions. In addition to the built-in functions, PHP also allows you to define your own functions. It is a way to create reusable code packages that perform specific tasks and can be kept and maintained separately form main program. Here are some advantages of using functions:. The declaration of a user-defined function start with the word functionfollowed by the name of the function you want to create followed by parentheses i.

php call function with parameters in array

A function name must start with a letter or underscore character not with a number, optionally followed by the more letters, numbers, or underscore characters. Function names are case-insensitive. You can specify parameters when you define your function to accept input values at run time.

The parameters work like placeholder variables within a function; they're replaced at run time by the values known as argument provided to the function at the time of invocation. You can define as many parameters as you like. However for each parameter you specify, a corresponding argument needs to be passed to the function when it is called. The getSum function in following example takes two integer values as arguments, simply add them together and then display the result in the browser.

An argument is a value that you pass to a function, and a parameter is the variable within the function that receives the argument.

However, in common usage these terms are interchangeable i. As you can see the third call to customFont doesn't include the second argument. A function can return a value back to the script that called the function using the return statement. The value may be of any type, including arrays and objects.

A function can not return multiple values. However, you can obtain similar results by returning an array, as demonstrated in the following example. In PHP there are two ways you can pass arguments to a function: By default, function arguments are passed by value so that if the value of the argument within the function is changed, it does not get affected outside of the function.

However, to allow a function to modify its arguments, they must be passed by reference. However, you can declare the variables anywhere in a PHP script.

php call function with parameters in array

But, the location of the declaration determines the extent of a variable's visibility within the PHP program i. This accessibility is known as variable scope. By default, variables declared within a function are local and they cannot be viewed or manipulated from outside of that php call function with parameters in array, as demonstrated in the example below:.

Similarly, if you try to access or import an outside variable inside the function, you'll get an undefined variable error, as shown registered us commodity futures trading commission wikipedia the following example:.

As you can see in the above examples the variable declared inside the function is curs valutar interbancar in timp real forex accessible from outside, likewise the variable declared outside of the function is not accessible inside of the function.

Passing named parameters to a php function through call_user_func_array - Stack Overflow

This separation reduces the chances of variables within a function getting affected by the variables in the main program. It is possible to reuse the same name for a variable in different functions, since local variables are only recognized by the function in which they are declared.

There may be a situation when you need to import a variable from the main program into a function, or vice versa. In such cases, you can use the global keyword before the variables inside a function. This keyword turns the variable into a global variable, making it visible or accessible both inside and outside the function, as show in the example below:.

You will learn more about visibility and access control in PHP classes and objects chapter. A recursive function is a function that calls itself again and again until a condition is satisfied. Recursive functions are often used to solve complex mathematical calculations, or to process deeply nested structures e.

Be careful while creating recursive functions, because if code is written improperly it may result in an infinite loop of function calling. Is this page helpful to you? PHP Functions In this tutorial you will learn how to create your own custom functions in PHP. PHP Built-in Functions A function is a self-contained block of code that performs a specific task.

PHP User-Defined Functions In addition to the built-in functions, PHP also allows you to define your own functions. Here are some advantages of using functions: Functions reduces the repetition of code within a program — Function allows you to extract commonly used block of code into a single component. Now can you can perform the same task by calling this function wherever you want without having to copy and paste the same block of code again and again.

PHP Functions

Functions makes the code much easier to maintain — Since a function created once can be used many times, so any changes made inside a function automatically implemented at all the places without touching the several files. Functions makes it easier to eliminate the errors — When the program is subdivided into functions, if any error occur you know exactly what function causing the error and where to find it.

Therefore, fixing errors becomes much easier. Functions can be reused in other application — Because a function is separated from the rest of the script, it's easy to reuse the same function in other applications just by including the php file containing those functions.

The following section will show you how easily you can define your own function in PHP. Creating and Invoking Functions The basic syntax of creating a custom function can be give with: Previous Page Next Page. Your Name optional Your E-mail optional.

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