Type Comparison There are two types of comparison: loose comparison with == and strict comparison with===. Strict comparison ensures both the type and value of both sides of the operator …

Single Line Comments The single line comment begins with “//” or “#”. When encountered, all text to the right will be ignored by the PHP interpreter. // This is a …

Defining constants Constants are created using the const statement or the define function. The convention is to use UPPERCASE letters for constant names Define constant using explicit values const PI …

To build a dynamic and interactive PHP program, it is useful to output variables and their values. The PHP language allows for multiple methods of value output. This topic covers …

Variable scope refers to the regions of code where a variable may be accessed. This is also referred to as visibility. InPHP scope blocks are defined by functions, classes, and …

Chapter 2: VariablesAccessing A Variable Dynamically By Name (Variable variables)Variables can be accessed via dynamic variable names. The name of a variable can be stored in another variable, allowing it …

PHP 7.xVersion Supported Until Release Date7.1 2019-12-01 2016-12-017.0 2018-12-03 2015-12-03PHP 5.xVersion Supported Until Release Date5.6 2018-12-31 2014-08-285.5 2016-07-21 2013-06-205.4 2015-09-03 2012-03-015.3 2014-08-14 2009-06-305.2 2011-01-06 2006-11-025.1 2006-08-24 2005-11-245.0 2005-09-05 2004-07-13PHP 4.xVersion …

Nonlocal Variables Python 3.x Version ≥ 3.0Python 3 added a new keyword called nonlocal. The nonlocal keyword adds a scope override to the inner scope. You can read all about …

Python operators have a set order of precedence, which determines what operators are evaluated first in apotentially ambiguous expression. For instance, in the expression 3 * 2 + 7, first …

‘and’ and ‘or’ are not guaranteed to return a boolean When you use or, it will either return the first value in the expression if it’s true, else it will …