PHP challenges

Practice problem statements with input format, output format, constraints and solutions.

beginner

PHP Introduction challenge

Build a small solution that uses PHP Introduction in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "PHP Introduction";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core php introduction pattern before polishing the final output.

Solution

<?php
$lesson = "PHP Introduction solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

PHP Syntax challenge

Build a small solution that uses PHP Syntax in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "PHP Syntax";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core php syntax pattern before polishing the final output.

Solution

<?php
$lesson = "PHP Syntax solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

Variables and Constants challenge

Build a small solution that uses Variables and Constants in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "Variables and Constants";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core variables and constants pattern before polishing the final output.

Solution

<?php
$lesson = "Variables and Constants solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

Data Types challenge

Build a small solution that uses Data Types in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "Data Types";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core data types pattern before polishing the final output.

Solution

<?php
$lesson = "Data Types solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

Operators challenge

Build a small solution that uses Operators in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "Operators";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core operators pattern before polishing the final output.

Solution

<?php
$lesson = "Operators solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

Conditional Statements challenge

Build a small solution that uses Conditional Statements in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "Conditional Statements";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core conditional statements pattern before polishing the final output.

Solution

<?php
$lesson = "Conditional Statements solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

Loops challenge

Build a small solution that uses Loops in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "Loops";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core loops pattern before polishing the final output.

Solution

<?php
$lesson = "Loops solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

Functions challenge

Build a small solution that uses Functions in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "Functions";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core functions pattern before polishing the final output.

Solution

<?php
$lesson = "Functions solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

Arrays Basics challenge

Build a small solution that uses Arrays Basics in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "Arrays Basics";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core arrays basics pattern before polishing the final output.

Solution

<?php
$lesson = "Arrays Basics solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);
beginner

Array Methods challenge

Build a small solution that uses Array Methods in PHP and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

<?php
$lesson = "Array Methods";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core array methods pattern before polishing the final output.

Solution

<?php
$lesson = "Array Methods solution";
$checklist = ["understand", "run", "change", "explain"];
echo $lesson . ": " . implode(" -> ", $checklist);