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
Joins array elements into a string using a delimiter with implode().
<?php
$words = ['PHP', 'is', 'a', 'popular', 'scripting', 'language'];
$sentence = implode(" ", $words);
echo "Joined Sentence: " . $sentence . "\n";
?>Joined Sentence: PHP is a popular scripting language
Demonstrates built-in PHP functions like strlen, strrev, strtolower, and str_replace.
<?php
$text = "Hello PHP World!";
echo "Length: " . strlen($text) . "\n";
echo "Reversed: " . strrev($text) . "\n";
echo "Lowercase: " . strtolower($text) . "\n";
echo "Replaced: " . str_replace("World", "Developers", $text) . "\n";
?>Length: 16 Reversed: !dlroW PHP olleH Lowercase: hello php world! Replaced: Hello PHP Developers!
Converts PHP arrays to JSON strings and decodes JSON back into PHP objects.
<?php
$data = [
"status" => "success",
"code" => 200,
"items" => ["Apple", "Banana", "Cherry"]
];
$jsonString = json_encode($data, JSON_PRETTY_PRINT);
echo "JSON Output:\n" . $jsonString . "\n\n";
$decoded = json_decode($jsonString, true);
echo "Decoded Status: " . $decoded['status'] . "\n";
?>JSON Output:
{
"status": "success",
"code": 200,
"items": [
"Apple",
"Banana",
"Cherry"
]
}
Decoded Status: successDemonstrates regular sort() versus natural order sorting using natsort().
<?php
$files1 = ["img1.png", "img10.png", "img2.png", "img20.png"];
$files2 = $files1;
sort($files1);
echo "Standard Sort:\n" . implode(", ", $files1) . "\n\n";
natsort($files2);
echo "Natural Sort:\n" . implode(", ", $files2) . "\n";
?>Standard Sort: img1.png, img10.png, img2.png, img20.png Natural Sort: img1.png, img2.png, img10.png, img20.png
Checks if two strings are anagrams using character frequency comparison.
<?php
function isAnagram(string $str1, string $str2): bool {
$s1 = strtolower(str_replace(' ', '', $str1));
$s2 = strtolower(str_replace(' ', '', $str2));
return count_chars($s1, 1) === count_chars($s2, 1);
}
$word1 = "listen";
$word2 = "silent";
if (isAnagram($word1, $word2)) {
echo "'$word1' and '$word2' are Anagrams.\n";
} else {
echo "'$word1' and '$word2' are NOT Anagrams.\n";
}
?>'listen' and 'silent' are Anagrams.
Formats raw 10-digit phone number strings into standard (XXX) XXX-XXXX format using preg_replace().
<?php
function formatPhoneNumber($phone) {
$cleaned = preg_replace('/[^0-9]/', '', $phone);
if (strlen($cleaned) === 10) {
return preg_replace('/(\d{3})(\d{3})(\d{4})/', '($1) $2-$3', $cleaned);
}
return $phone;
}
$rawPhone = "1234567890";
echo "Formatted Phone: " . formatPhoneNumber($rawPhone) . "\n";
?>Formatted Phone: (123) 456-7890
Parses email address strings using strstr() or explode() to retrieve username portion.
<?php $email = "john.doe_dev@example.com"; $username1 = strstr($email, '@', true); echo "Extracted Username: $username1\n"; ?>
Extracted Username: john.doe_dev
Generates secure random strings of desired length using random_int() and str_shuffle().
<?php
function generatePassword($length = 12) {
$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()";
$password = "";
$maxIndex = strlen($chars) - 1;
for ($i = 0; $i < $length; $i++) {
$password .= $chars[random_int(0, $maxIndex)];
}
return $password;
}
echo "Generated Password: " . generatePassword(12) . "\n";
?>Generated Password: K8#mP2$xL9!v
Pads numeric strings with leading zeros using sprintf() or str_pad().
<?php
$number = 42;
$formatted1 = sprintf("%06d", $number);
$formatted2 = str_pad($number, 6, "0", STR_PAD_LEFT);
echo "Formatted sprintf: $formatted1\n";
echo "Formatted str_pad: $formatted2\n";
?>Formatted sprintf: 000042 Formatted str_pad: 000042
| 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.