Category: 12. PHP

To enable mathematical operations, PHP has mathematical (arithmetic) operators and a number of mathematical functions. In this chapter, the following mathematical functions are explained with examples. PHP abs() Function The abs() function is an in-built function in PHP iterpreter. This function accepts any number as argument and returns a positive value, disregarding its sign. Absolute…

This chapter will explain following functions related to files − Opening and Closing Files The PHP fopen() function is used to open a file. It requires two arguments stating first the file name and then mode in which to operate. Files modes can be specified as one of the six options in this table. Sr.No Mode &…

Integer is one of the built-in scalar types in PHP. A whole number, without a decimal point in the literal, is of the type “int” in PHP. An integer can be represented in decimal (base 10), hexadecimal (base 16), octal (base 8) or binary (base 2) notation. To use octal notation, a number is preceded…

In PHP, “bool” is one of the built-in scalar data types. It is used to express the truth value, and it can be either True or False. A Boolean literal uses the PHP constants True or False. These constants are case-insensitive, in the sense, true, TRUE or True are synonymous. You can declare a variable…

A string is a sequence of characters, like ‘PHP supports string operations.’ A string in PHP as an array of bytes and an integer indicating the length of the buffer. In PHP, a character is the same as a byte. This means that PHP only supports a 256-character set, and hence does not offer native…

PHP is known as a dynamically typed language. The type of a variable in PHP changes dynamically. This feature is called “type juggling” in PHP. In C, C++ and Java, you need to declare the variable and its type before using it in the subsequent code. The variable can take a value that matches with…

The term “Type Casting” refers to conversion of one type of data to another. Since PHP is a weakly typed language, the parser coerces certain data types into others while performing certain operations. For example, a string having digits is converted to integer if it is one of the operands involved in the addition operation.…

The term “data types” refers to the classification of data in distinct categories. PHP has a total of eight data types that we use to construct our variables − The first five are simple types, and the next two (arrays and objects) are compound types. The compound types can package up other arbitrary values of…

The magical constants in PHP are predefined constants. They are available to any script on which they run, and they change depending on where they are used. All these “magical” constants are resolved at compile time, unlike regular constants, which are resolved at runtime. There are nine magical constants in PHP. These special constants are…

A constant in PHP is a name or an identifier for a simple value. A constant value cannot change during the execution of the PHP script. Examples of Valid and Invalid Constant Names in PHP Here are some examples of valid and invalid constant names in PHP − Difference between Constants and Variables in PHP…