Key Takeaway: Practice PHP programming with 84+ practical code examples covering syntax, arrays, strings, functions, OOP, JSON, and file handling — all with expected terminal outputs.
Audience & Use Case: Designed for web developers, backend engineers, Laravel developers, computer science students, and interview candidates mastering modern PHP.
Who is this for: Web developers, Laravel learners, API engineers, and CS students.
Related Tools:PHP Compiler · PHP Official Manual · JavaScript Examples · Python Examples
Reads a file, matches pattern using regex, replaces with empty string, and saves.
<?php
$content = "DEBUG [2026-09-01]: Test message.\nINFO: User logged in.\nDEBUG [2026-09-01]: Another trace.";
$cleanedContent = preg_replace('/DEBUG.*?\n/s', '', $content);
echo "Cleaned File Content:\n$cleanedContent\n";
?>Cleaned File Content: INFO: User logged in. DEBUG [2026-09-01]: Another trace.
Formats current date and time using date() and strtotime().
<?php
date_default_timezone_set('UTC');
echo "Current Date: " . date('Y-m-d H:i:s') . "\n";
echo "Formatted: " . date('F j, Y, g:i a') . "\n";
echo "Tomorrow: " . date('Y-m-d', strtotime('+1 day')) . "\n";
?>Current Date: 2026-09-01 22:45:00 Formatted: September 1, 2026, 10:45 pm Tomorrow: 2026-09-02
Demonstrates file_put_contents and file_get_contents for quick file handling.
<?php
$filename = "sample.txt";
$content = "Hello, PHP File System!\nWritten on: " . date('Y-m-d');
file_put_contents($filename, $content);
$readContent = file_get_contents($filename);
echo "File Content:\n" . $readContent . "\n";
?>File Content: Hello, PHP File System! Written on: 2026-09-01
Parses CSV data lines using str_getcsv() or fgetcsv().
<?php
$csvData = "Name,Role,City\nAlice,Developer,New York\nBob,Designer,London\nCharlie,Manager,Tokyo";
$lines = explode("\n", trim($csvData));
$header = str_getcsv(array_shift($lines));
$rows = [];
foreach ($lines as $line) {
$rows[] = array_combine($header, str_getcsv($line));
}
print_r($rows);
?>Array
(
[0] => Array
(
[Name] => Alice
[Role] => Developer
[City] => New York
)
[1] => Array
(
[Name] => Bob
[Role] => Designer
[City] => London
)
[2] => Array
(
[Name] => Charlie
[Role] => Manager
[City] => Tokyo
)
)Demonstrates image file validation, directory upload, and PDO path storage.
<?php
function processImageUpload($fileName, $fileTmp, $fileSize) {
$allowedTypes = ['jpg', 'jpeg', 'png', 'gif'];
$ext = strtolower(pathinfo($fileName, PATHINFO_EXTENSION));
if (!in_array($ext, $allowedTypes)) {
return "Invalid file type.";
}
if ($fileSize > 2 * 1024 * 1024) {
return "File size exceeds limit (2MB).";
}
$newFilename = uniqid('img_') . '.' . $ext;
$uploadDir = 'uploads/' . $newFilename;
return "Success! Stored path for PDO insertion: " . $uploadDir;
}
echo processImageUpload("profile.png", "/tmp/php123", 500000) . "\n";
?>Success! Stored path for PDO insertion: uploads/img_66d4f9e12a.png
Extracts file extensions using pathinfo() and PATHINFO_EXTENSION.
<?php $filename = "document.report.v2.pdf"; $extension = pathinfo($filename, PATHINFO_EXTENSION); echo "File: $filename\n"; echo "Extension: $extension\n"; ?>
File: document.report.v2.pdf Extension: pdf
| Domain | Core Concepts | Primary Use Case | Official Docs |
|---|---|---|---|
| Variables & Types | $var, string, int, bool | Variables, string concatenation, type declarations | PHP Types |
| Arrays & Data | Indexed arrays, Associative ['key' => 'val'] | Key-value mappings, list iteration with foreach | PHP Arrays |
| Functions | function name(type $param): returnType | Modular code, default arguments, return value typing | PHP Functions |
| OOP Constructs | class, extends, public/protected | Encapsulation, constructors, inheritance, web frameworks | PHP OOP |
Use the online PHP compiler to test snippet modifications, test array manipulation logic, and build custom functions for backend applications.
[], and standard OOP paradigms compatible with PHP 7.4 through PHP 8.x and frameworks such as Laravel and Symfony. PHP powers over 75% of the active web today. Practicing short, clear programs is the most efficient path to mastering PHP backend development. Each snippet focuses on a fundamental building block — from basic variable output and control structures to complex associative arrays, JSON serialization, and object-oriented design.
Learn echo syntax, variable assignment, type coercion, and simple arithmetic operations.
Master key-value arrays, foreach loops, function type hints, and string/math helpers.
Explore classes, inheritance, visibility, JSON APIs, and file read/write operations.