Masthead Technologies PHP Developer Interview Questions and Answers

div is a block-level element used for grouping and styling content, while span is an inline element used for styling specific parts of content.

• div is a container element, while span is a text-level element

• div creates a new line, while span does not

• div can have width and height properties, while span cannot

• div can contain other block-level elements, while span cannot

JDBC is a Java API for connecting and executing queries on a database.

• JDBC stands for Java Database Connectivity.

• It provides a set of classes and interfaces to interact with databases.

• JDBC allows developers to write database-independent code.

• It supports various database operations like connecting, querying, updating, and deleting data.

• JDBC drivers are used to establish a connection between Java application and database...read more

C++ supports multiple inheritance while Java supports single inheritance.

• C++ allows a class to inherit from multiple classes, while Java only allows a class to inherit from a single class.

• In C++, a class can have multiple parent classes, resulting in a complex class hierarchy.

• Java enforces single inheritance to avoid the diamond problem and maintain simplicity.

• For example, in C++, a class can inherit from both a 'Vehic...read more

Types of databases include relational, NoSQL, object-oriented, and graph databases.

• Relational databases store data in tables with predefined schemas, using SQL for querying (e.g. MySQL, Oracle)

• NoSQL databases are schema-less and provide flexible data models (e.g. MongoDB, Cassandra)

• Object-oriented databases store objects as they are, with support for inheritance and encapsulation (e.g. db4o)

• Graph databases use nodes an...read more

SQL databases are structured and use a fixed schema, while NoSQL databases are unstructured and have a flexible schema.

• SQL databases use structured query language for defining and manipulating the data.

• NoSQL databases use various data models like key-value, document, columnar, or graph.

• SQL databases are suitable for complex queries and transactions.

• NoSQL databases are horizontally scalable and provide high performance ...read more

The choice of database depends on factors like data structure, scalability, performance, and query requirements.

• Consider the data structure and relationships between entities.

• Evaluate the scalability requirements of the task.

• Analyze the performance needs, including read and write operations.

• Assess the query requirements, such as complex joins or aggregations.

• Examples: relational databases for structured data, NoSQL for

Relational databases store data in tables with predefined relationships. Non-relational databases store data in flexible, schema-less formats.

• Relational databases: MySQL, Oracle, SQL Server

• Non-relational databases: MongoDB, Cassandra, Redis

• Relational databases use structured query language (SQL) for data manipulation

• Non-relational databases provide high scalability and flexibility

• Relational databases are suitable for c...read more

The task is to add the consecutive numbers present in a given string.

• Iterate through the string character by character

• Check if the current character is a digit

• If it is a digit, continue iterating until a non-digit character is encountered

• Convert the consecutive digits into a number and add it to the sum

• Repeat the process until all characters are processed

• Return the sum