PHP core tutorial

      Introduction to PHP

      How PHP works?

      Install php on Mac

      Hello World application

      Php: apache: hello world application

      Access query parameters

      post form example

      Basic syntax

      variables

      Variable references

      echo: print the data to console

      comments: Documenting the code

      Php: data types

      Booleans

      is_bool: check variable holds Boolean value or not

      strings

      Single vs double quotes

      in place substitution of variables in a string

      Concatenate strings

      Escape characters

      built-in string functions

            strtolower: Get the string in lowercase form

            strtoupper: Get the string in uppercase form

            ucfirst: Make a string's first character uppercase

            lcfirst: Make a string's first character lowercase

            ucwords: Uppercase the first character of each word in a string

            strlen: Get string length

            ltrim, rtrim, trim : Trim the string

            strrev: Reverse a string

            substr: Return part of a string

      NULL: Represent nothing

      Emptiness

      Constants

      Arrays

            Add an element to the array

            Add an element to associate array

            Update values of array using reference

            Array pointers

            Basic array functions

                  array: count: count number of elements in the array

                  Array: max, min: get maximum and minimum value of array

                  sort: Sort the elements of array in ascending order

                  rsort: Sort array contents in descending order

                  is_array(): Chek whether a variable is an array

                  in_array: Check for existence of an element

      Operators

            Comparison operators

            <=>: Spaceship operator

            Logical operators

            Arithmetic operators

            what is the sign of modulo operator result?

            ++, --: increment and decrement operators

      Conditional statements

      if statement

      php is loosely coupled: === operator

      else statement

      if – else if - else statement

      Ternary operator

      switch statement

      while loop

      do-while loop

      for-each loop

      break statement: exit from the loop

      continue statement

      multi-dimensional arrays

            Access elements in a multi-dimensional array

      functions

            Access variables defined outside of a function

            Set default value to function argument

            functions: return a value from function

            Functions: pass the argument by reference

            Anonymous function

            Classes and objects

            How to define a class?

            get_declared_classes: Get all the classes that Php knows

            class_exists: Check whether class is defined or not

            How to get an object from class?

            Add properties to class definition

            Add methods to the class definition

            $this: refer to current instance properties

            Convert an object to string

            Class inheritance

            Override method definitions in subclass

            Access specifiers (or) visibility modifiers

            Adding dynamic properties, overloading

            Setter and getter methods

            Static properties

            static methods

            Access static properties from super classes

            new self(): Return instance of the class where new statement is defined

            new self() vs new static()

            Class level constants

            How to refer parent class properties, methods from sub class

            __construct: Constructor method

            Constructors and inheritance

            Why to use array as an argument to constructor definition

            clone an object

            __clone called while cloning an object

            Object are assigned by reference

            Implement singleton design pattern

            How to compare two objects?

      Return multiple values from a function

      Organizing your code

      include_once, require_once

      Interfaces

            class implement multiple interfaces

      Traits

      Abstract classes

      namespaces

      namespace: access entities using aliases

      Exception handling

      How to throw an exception

      Handle Exceptions

      try and multiple catch statements

      finally block

      uncaught exception handler

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