Introduction to PHP

PHP is a popular scripting language that is commonly used to build dynamic web applications. Here are some basics of PHP:

• PHP stands for Hypertext Preprocessor.
• PHP scripts are executed on the server-side, generating HTML, CSS, and JavaScript code that is sent to the client-side for display in the web browser.
• PHP code is embedded in HTML code using special tags <?php and ?>.

Variables:

Variables are used to store values in PHP. Here's how to declare a variable in PHP:

• The variable name must start with a dollar sign ($).
• The value can be a string, number, or other data type.

Data Types:

PHP supports several data types, including:

• String: a sequence of characters, enclosed in quotes.
• Integer: a whole number, either positive or negative.
• Float: a number with a decimal point.
• Boolean: a value that is either true or false.
• Array: a collection of values.
• Object: an instance of a class.
• Null: a value that represents nothing.

Operators:

PHP supports several operators for performing arithmetic, comparison, and logical operations. Here are some examples:

• Arithmetic operators: + (addition), - (subtraction), * (multiplication), / (division), % (modulus).
• Comparison operators: == (equal to), != (not equal to), > (greater than), < (less than), >= (greater than or equal to), <= (less than or equal to).
• Logical operators: && (and), || (or), ! (not).