Variables in PHP

A variable is a named location in memory to store data temporarily. PHP is dynamically typed language. So, there is no need for mentioning the data type of a variable.

The type will be detected automatically based on the value assigned to the variable. A variable can be created as shown below:

$var1 = 10;

A variable which is not assigned a value contains NULL. In expressions containing numbers, NULL will be coerced to 0 and in case of strings, NULL will be coerced to an empty string. A variable can be printed as shown below:

print(“Value of var1 is: $var1”);

A variable can be checked if it contains a value other than NULL by using the function IsSet. This function returns TRUE if the variable contains a non-NULL value and FALSE if it contains a NULL value.

A video tutorial on declaring and using variables in PHP scripts:

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.