PHP Interview Questions and Answers

So, require_once() is recommended to use when you want to include a file where you have a lot of functions. The Require() function is also used to put data of one PHP file to another PHP file. If there are any errors then the require() function produces a warning and a fatal error and stops the execution of the script.

PHP developer interview questions

That is why you cannot change the content after running the script. On the other hand, while running dynamic websites’ scripts, the script is changeable. As a result, every time a user visits the site, the contents get regenerated. As a programming language, PHP has become an essential skill set with businesses turning to web-based solutions. Consequently, the demand for developers who are well-versed in PHP continues to rise. The function parse_ini_file() enables us to load in the ini file specified in the filename and returns the settings in it in an associative array.

What are the __construct() and __destruct() methods in a PHP class?

Booleans – come with only possible values of either true or false. Interestingly, it’s one of the most widely-used server-side languages and has been so for the past 25 years. Despite its long-term history, the demand for PHP hasn’t dwindled. Board of Labor Statistics, there will be a 15% increase in web development positions — including PHP positions — by 2026. There is more to interviewing than tricky technical questions, so these are intended merely as a guide. Not every “A” candidate worth hiring will be able to answer them all, nor does answering them all guarantee an “A” candidate.

PHP developer interview questions

There are two methods to connect MySQL database with PHP. PHP fwrite() and fputs() functions are used to write data into file. To write data into a file, you need to use w, r+, w+, x, x+, c or c+ mode. The header() function is used to send a raw HTTP header to a client.

Learn Perl-the Jewel of Scripting Languages

But one thing is sure—every candidate must undergo a rigorous testing and interview process. The session unregister() function frees all session variables while the session unset() function unregisters a global variable from the current session. PHP callbacks are functions that PHP can use to call them dynamically. Native functions such as array map, usort, preg replace callback, and others use them. A callback function is a function that you write and then provide as a parameter to another function. Once the receiving function has access to your callback function, it can use it whenever it wants.

Rather than storing element values in a strict linear index sequence, this saves them in conjunction with key values. The final keyword in a method declaration implies that subclasses will not be able to override the method. It is not Middle PHP developer job possible to subclass a class that has been declared final. This is especially handy when designing immutable classes, such as the String class. Only classes and methods can be declared final; properties cannot be declared final.

What is the difference between the functions strstr() and stristr()?

Hence, this design choice is based on that reality, and developers choose to avoid that. The interviewer can better understand your commitment to professional development using this important PHP interview question for senior developers. Describe how you keep abreast of market changes and advancements, such as new PHP iterations and web frameworks. Knowing the questions an interviewer might ask about your profession, such as for senior software developer or backend developer roles, is important. Comparing objects in PHP is a valuable way to determine if two things are equal. The comparison is made based on the properties of the object and the values of those properties.

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In the case of ‘0xFF’, the first non-numeric character is ‘x’, so the only part of the string processed is the initial ‘0’. As a result, the value returned by ‘0xFF’ is 0, so when the code completes, $x will be equal to 0. Traits are a mechanism that provides some of the reuse advantages of multiple inheritance in languages like PHP where multiple inheritance is not supported. Traits enable developers to reuse combinations of methods from different class hierarchies. The scope of a variable is the context within which it is defined.

Q47. How can you encrypt password using PHP?

PHP provides a special function called __construct() to define a constructor. You can pass as many as arguments you like into the constructor function. PHP uses mysql_query function to create a MySQL database. This function takes two parameters and returns TRUE on success or FALSE on failure. The date() function returns a formatted string representing a date. You can exercise an enormous amount of control over the format that date() returns with a string argument that you must pass to it.

PHP developer interview questions

Make use of isset() function to check if session variable is already set or not. This function requires upto six arguments and should be called before tag. For each cookie this function has to be called separately.

PHP Developer Interview Questions

The POST method has no limit on the size of the data sent. Establish a connection to the MySQL server from your PHP script. Continue – forces the loop to skip the rest of its body and immediately re-check its state before repeating. If the value is a number, it will be false if it is exactly zero, and true otherwise. Strings are sequences of characters, for example, “PHP supports string operations”.

  • Spaces and special characters are not permitted instead of a PHP variable.
  • For instance, we can write a .csv file, select a separator between fields , and then proceed to open the file with Excel.
  • I Hope thesePHP Interview Questionswill help you in your interviews.
  • Highlights areas of expertise and indicates an understanding of front-end languages.

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