How to Use the PHP Compiler

To use the PHP Compiler, follow these steps:

  1. In the code editor, write your PHP code.
  2. Click the "RUN" button to compile and run your code.
  3. The output will be displayed in the console below the code editor.

Taking Inputs

In PHP, you can take inputs from the user in various ways. However, please note that interactive input is not commonly used in PHP as it is often used for web development where data is read from form inputs or query parameters. Here is an example of how you can read command-line input:

echo "Enter a string: ";
$input = fgets(STDIN);
echo "You entered: $input";

Importing Libraries

PHP has a rich set of built-in libraries that can be used in your programs. Here are some examples:

Using the Math Library

$result = sqrt(25);
echo "Square root of 25 is $result";

Using the Array Functions

$arr = array(1, 2, 3, 4, 5);

Syntax 101

PHP is a popular general-purpose scripting language that is especially suited to web development. Here's a primer on the major syntax basics of PHP:


Variables in PHP start with a $ sign, followed by the name of the variable.

$name = "John Doe"; // Variable assignment
$age = 25; // Variable assignment

Control Structures

PHP includes control structures such as if, else, for, while, and switch.

// If-Else
if ($age > 18) {
    echo "Adult";
} else {
    echo "Minor";

// For loop
for ($i = 0; $i < 5; $i++) {
    echo $i;

// Switch
switch ($day) {
    case "Monday":
        echo "Start of the work week";
    case "Friday":
        echo "End of the work week";
        echo "Midweek";


Functions in PHP are defined with the function keyword.

function greet($name) {
    echo "Hello, $name";

greet("John Doe"); // Calls the function with "John Doe" as the argument

PHP Online Test

A PHP online test is an effective way to assess an individual's PHP programming skills, especially in the context of web development. These tests typically include a mix of theoretical questions and practical coding challenges. By attempting these tests, candidates can demonstrate their understanding of PHP concepts, their problem-solving abilities, and their proficiency in writing efficient code. PHP online tests are commonly used in technical interviews, coding bootcamps, and online learning platforms to gauge a learner's understanding and proficiency in PHP.