Hire Top Freelance PHP developers with Ultragenius

Ultragenius is a marketplace for top software developers, engineers, programmers, coders, architects, and consultants. Top start-ups and companies choose developers from Ultragenius platform for their critical software projects. Hire from Ultragenius network & scale your engineering team in a matter of few days. 

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PHP Freelance Developer

Rishabh is a software engineer having 7+ years of experience in designing server side web applications using PHP. He has in-depth experience working with Laravel, Laminas, CakePHP, and Drupal.

Expert in






10 Years


Full Time


PHP developer

Mahesh is a PHP developer skilled in developing dynamic websites combining PHP and MySQL, delivering unique solutions for clients' problems. His skillset include PHP, MySQL, PHPUnit, and CodeIgniter.

Expert in





10 Years


Full Time


Senior PHP Developer

John is well-versed in developing server-side dynamic web applications. His skillset include PHP, Laravel, PostgreSQL, Java, HTML, CSS, and Javascript.

Expert in






10 Years


Full Time

Hire top freelance PHP developers with Ultragenius

PHP stands for Hypertext Pre-processor. It is a platform independent server-side scripting language used for developing dynamic and user-interactive websites. PHP is very useful in developing secure web applications by using testing frameworks like PHPUnit and Codeception.

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Developers' Reviews for Ultragenius

Ultragenius offers a great opportunity to work in mission-driven U.S. companies with a great salary. I am glad that I chose Ultragenius to find my dream job.
Jason Martin
PHP Developer
Once you are part of Ultragenius, you don't have to look for another platform which leads you to your dream job. Ultragenius's vetting tests and assessments are unmatchable and helped me a land an excellent job.
Barbara Smith
Senior PHP Developer
I will thank to Ultragenius wholeheartedly. It helped me securing a career-growing high paid job which I couldn't think would be possible for me without this top connecting network.
Mark Sommers
Backend Engineer

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Want to hire freelance PHP developers on your own? Here are the skills you must look for while hiring a PHP developer

Hiring freelance PHP developers might be an intricate task for you if you are a non-technical manager. Today, PHP is one of the evergreen server-side languages for developing web applications and is used as a general-purpose programming language. Hiring dedicated freelance PHP developers among thousands of developers is a challenging task for anybody. So, here Ultragenius comes to assist you while recruiting freelance PHP developers on your own. Ultragenius understands your job requirements and gets you only the most skilled developers who have strong foundation of PHP.

The following core skills you must ensure while hiring a freelance PHP developer

Strong knowledge of core PHP functions

The PHP developers must be well-acquainted with the core inbuilt functions because it is one of the most effective tools used in programming. Some of the popular functions you must ask while hiring a freelance PHP developer are –

  • Array  –  array(), is_array(), in_array(), array_merge(), array_keys(), array_key_exists(), array_shift(), array_push(), array_pop(), array_values(), array_map(), array_unique(), array_slice(), array_diff(), array_search(), array_reverse(), and array_unshift().

  • String – substr(), strlen(), str_replace(), trim(), strpos(), strtolower(), strtoupper(), is_string(), and strstr().

Some other frequently used PHP functions are count(), date(), htmlentities(), htmlspecialchars(), strip_tags, addslashes, stripslashes, explode, implode, rand(), str_replace, strlend(), array_combine(), array_multisort(), array_unique(), print_r().

Strong understanding of HTML, CSS, and Javascript

React.js is one of the smooth-running and interactive front-end frameworks to work with only if a developer is skilled in HTML, CSS, and Javascript. The developer must know more than one Javascript library framework like jQuery, Bootstrap and must be specialized in working with Asynchronous Javascript and XML (AJAX). Check if the developers have worked with Leaner CSS and Syntactically Awesome Stylesheet (SASS) and Javascript build tools such as Grunt.js, Gulp.js, and Bower.js.

Experienced with Object-Oriented Programming (OOPS) Concepts -

Object-Oriented Programming (OOPS) is a software-development approach concerned with real-world objects, such as vehicles, banks, employees, etc. OOPS mainly comprises of –

  • Encapsulation – Encapsulation is binding the data members and functions that expose only the functions in the class and hide the private members. 

It is an important concept used widely in software development and helps reduce software complexity, protect the internal state of an object as accessing the variables/members is possible through getter and setter methods. Also, the implementation inside methods can be changed without breaking the code which is using that class.

  • Inheritance – Inheritance is a real-time demand of every code which allows one class to extend the functionality of another class. The core feature of Inheritance is Re-usability. The class inheriting the class is called the child class or subclass and the class that is being inherited is called parent class or superclass. Instead of thousands of lines of code every time, developers can utilize the same code in inheriting classes as well. 

  • Abstraction – Abstraction is the process of defining the core functionalities of any class, hiding its implementation details. It tells what a class does instead of how it does. Here, you can ask the difference between Encapsulation and Abstraction, the former shows the inner implementation, and the latter shows the outer implementation. For example, take the example of a mobile phone, Encapsulation is how the display screen and keypad button are connected using circuits while Abstraction is any user can dial a number using the display screen and keypad button. 

  • Polymorphism – Polymorphism is the ability of any data to take more than one form. It is of two types – Compile-time Polymorphism and Run-time Polymorphism.
    In compile-time polymorphism, function overloading is implemented in which one function with the same name can have a different number of arguments and different return types.

    In run-time polymorphism, function overriding is implemented in which the child class / sub-class decides the implementation of the parent class / base-class function.
Well-versed with PHP frameworks

While hiring a PHP developer, check his/her knowledge of PHP frameworks, like Laravel, CodeIgniter, Magento, etc. CodeIgniter is an open-source PHP web development framework that allows faster web development by providing fully-featured database classes with the support for several platforms. CodeIgniter provides developers an easy approach to utilize modular functions and renders excellent migration support.

Laravel is used for developing server-side web applications and provides in-built authorization and authentication system, used for sessions, caching, and developing RESTful API services. Besides, Laravel is very useful for handling traffics on websites.

Experienced in working with Version Control System (VCS)

Developers must have a very good knowledge of version control systems, like Git, SVN, TFS, and Mercurial. Mostly, developers use Git for their work. It is the version control system that helps the team in collaborating and organizing your code, maintain the frequent changes that occur in the code. Git helps in reviewing the old codes and compares them with the newly updated code, pulling the code from their repository, and managing the commit history.

Along with this, the PHP developer must know how to use add, push, pull, and commit commands, branching, and merging as it allows developers to work independently on the code.

PHP Testing tools and Frameworks
For delivering quality code, knowledge of testing tools is very essential for a developer. Check the developer’s knowledge of testing tools like StoryPlayer, PHPUnit, SeleniumHQ, Codeception, and more.
  • PHPUnit is one of the widely used unit-testing frameworks in PHP. It provides various advantages like code coverage analysis, logging, mocking objects, etc. PHPUnit gives developers the advantage of writing test cases for all functions and methods, so if a bug occurs at any point then it can be easily identified. PHPUnit’s test results are customized and used in testing various types of controllers without extending.
  • StoryPlayer is another mostly used PHP testing framework used for testing both front-end and back-end web applications.
  • Codeception is also a very popular testing framework because of its test execution speed.
Understanding of databases

Connecting PHP with a database is very essential to deliver highly unique solutions for a project. To create a dynamic website with PHP, the developer must know combining it with a database like MySQL, PostgreSQL, or MongoDB.

Knowledge of CRUD operations on a database and commands like SELECT, INSERT, UPDATE, ADD, etc. is required to know for a freelance PHP developer.

Experience with web markup and UI, UX Concepts

The developer must have a firm understanding of element positioning, displaying the elements, and making components interactive, semantic markup, and other related UX Concepts so they can design the product with the best quality. The developer must be experienced in developing visual effects in presentational markup. For, example – How the heading appears, making text larger and putting weight to it, and giving which color to it, and which markup can include captions, bind columns, and row headings to table cells. 

Proficient in writing optimized and readable code

You must hire the PHP developers based on their ability to write clean and optimized code that is understandable by all the team members, and is scalable.

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Connect with the top 1% freelance PHP developers of the world at the lowest priceS

PHP is one of the widely used server-side languages to develop dynamic and secure web applications today. But recruiting the best freelance PHP developers is not an easy task where a large no. of PHP developers are competing to grab the job opportunities.

Top Interview Questions to ask while hiring a freelance PHP developer

A session in PHP is a way to store data for a user. Each session has its associated unique ID, which is used to retrieve stored values. To avoid conflict between multiple browsers, the PHP session creates a unique ID for each user.

For example, PHP session is used widely in shopping websites where a customer can store cart information like user_name, product_code, product_name, product_price, etc.

PHP session_start() is used to start a session and session_destroy() to destroy all the sessions used throughout a program.

There are mainly 8 types of variables present in PHP -

  • Integers - Integers are the whole numbers without any decimal point. For example - 1024, 1245.
  • Doubles - Doubles are the data types containing decimal or floating-point numbers. For example - 1024.5, 345.5.
  • Booleans - Booleans data type stores TRUE or FALSE values.
  • Arrays - An array is an ordered collection of homogeneous data types.
  • Strings - A string is defined as an array of characters stored in sequential manner, for example - “Hello World”.
  • Objects - Objects are the instances of the classes and are used widely in Object-Oriented Programming (OOP). 
  • Resources - A resource is a special data type that refers to an external source like file, database, input/output stream, etc.

A variable in PHP can have a short name like a and b, or more descriptive names like car_number, car_type, etc.

Following rules have to be considered while naming a PHP variable -

  • A variable must begin with the $ (dollar sign) in PHP, followed by the variable name.
  • A variable name always starts with an alphabet or underscore.
  • A variable name cannot begin with a number.
  • A variable name can only consists of alpha-numeric characters (a-z, A-Z, 0-9) and underscores ( _ ), for example - var $txt1, var $total_volume.
  • Variables in PHP are case-sensitive, for example, $TXT and $txt are two different variables.
Cookies are the text files used to store information of a user on the web browser by web-server so that when the same user comes back to that website, the information can be retrieved from the browser. The cookies are used to perform the following tasks -

  • Session Management - 
One of the wide use of cookies is Session Management. For example, when you purchase multiple items on an online shopping site, you keep adding them to carts and when you proceed to checkout, the items are added to the list, this is done using the concept of cookies.

  • Web Analytics / Tracking -
Cookies are used to track the user. When the user revisits the website, the web server sends a short stream of identifying info to your web browser. Cookies are identified and read using “name-value” pairs. This tells cookies what data to recall and where they have to be sent.

  • User Identification - 
Cookies are mainly used for tracking the user on a website so that the next time when the same user re-visits the website, the content according to the user’s choice is served. For example, Retargeting concept in online marketing is used to show advertisements of the relevant product based on the user’s choice of content.  
  • Variables’ value can be changed whereas the values of constant are fixed.
  • A variable requires compulsory usage of the $ sign before it while no dollar sign ($) is used before the constant.
  • A variable is defined by simple assignment whereas constant can be defined only using the define() function.
  • Variable’s default scope is the current access scope whereas the constant can be accessed throughout the program without any scope rules.
  • Notices - Notices are advisory messages which say what has to be done and what hasn’t been. Notices indicate the script came across something that can cause an error in the future but can also occur in the normal course of running a script. For example, Accessing a default variable.


    • Warnings - Warnings are non-fatal errors that occur without interrupting the program execution. For example, including a file that does not exist.


  • Errors - This is the critical error datatype which when occurs terminates the script execution. For example, require a non-existing file or accessing the non-existent object’s property.

  • $message is a simple variable but $$message is a reference to any variable. 

  • $message stores a fixed value and $$message stores the dynamic data of the variable and can be changed as the value of the variable changes.

PHP is partially case-sensitive because variables in PHP are case-sensitive whereas functions in PHP are not. For example, a function count is the same as function COUNT but $count and $MESSAGE are considered as two different variables.

The following are case-insensitive in PHP -

  • Conditional Statements in PHP such as if, else, if-else, switch, while, do-while, etc.
  • Keywords true and false.
  • User-defined functions and class names.
  • Create a MySQL database in the localhost.

  1. Create Database.

  2. Create a folder in htdocs.

  3. Create database connection file in PHP.

  4. Create a new PHP file to check your database connection.

  5. Run the program.

$serverName = “localhost”;
$userName = “root”;
$password = “abcd”;
Create connection
$conn = new mysqli($serverName, $userName, $password);
Check connection
if($conn - >connect_error){ die(“Connection failed :” . $conn->connect_error);
echo “Connected successfully”;

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Frequently Asked Questions

Ultragenius is one of the leading platforms for hiring remote talent and connecting freelance and part-time developers with Silicon Valley businesses. We focus on finding the best talents who will perform extremely well and will be easily integrated into your teams. We filter out only the top 1% most skilled freelance developers among the 20K+ developers who have applied on our platform. Candidates have to prove their self-reported experience by giving Ultragenius’ s skill tests.

Ultragenius first tests the developer’s skill set by conducting a two and half hour hiring test. Our hiring test judges a candidate on all aspects like aptitude, case study analysis, verbal and reasoning, coding questions based on data structures and algorithms, software engineering, system design, and more. Then, there is another round for the candidates who are selected from this round called “Higher-level Assessment Skill Test”, which is a video round that deeply analyzes freelance developers’ major skills and asks questions about the projects they have worked upon.

Fill up the form which is on every hiring freelancers’ page and we will inform you once we select the top 1% freelance PHP developers matching your job requirements.  After analyzing the candidates based on their resumes and two assessment tests, we provide you the feedback quickly. And if the freelancers selected by our team are fit for your job role, then we also provide the onboarding.

Ultragenius offers you only the most skilled freelance developers who are top 1% among the 20K+ freelance developers who have applied on our platform. After a rigorous selection and testing process, we sort out only the top candidates for you. You can check out Ultragenius’ s selection process for hiring freelance PHP developers on http://www.ultragenius.club/hire-php-freelancer

Ultragenius provides you the best facility to hire freelancers in more than 50 skills like React, Angular, Javascript, Node, Java, Python, Magento, Ruby On Rails, Golang, PHP, WordPress, .NET, Android, iOS, DevOps, Machine Learning, and many more.

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