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  • 3.1 PHP Operators
  • 3.2 PHP If Else Elseif
  • 3.3 PHP Switch
  • 3.4 PHP Loops
  • 3.4.1 While Loop
  • 3.4.2 Do While Loop
  • 3.4.3 For Loop
  • 3.4.4 Foreach Loop
  • 3.4.5 Break/Continue
  • 3.5 PHP Functions
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    3.1 PHP Operators

  • 1.1 PHP Intro
  • 1.2 PHP Install
  • 1.3 PHP Syntax
  • 1.4 PHP Comments
  • 1.5 PHP Variables
  • 1.5.1 Variables Scope
  • 1.6 PHP Echo / Print
    •
  • 2.1 PHP Data Types
  • 2.2 PHP Strings
  • 2.3 PHP Numbers
  • 2.4 PHP Math
  • 2.5 PHP Constants
  • 2.6 PHP Casting
  • 2.7 PHP Magic Constants
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  • 3.1 PHP Operators
  • 3.2 PHP If Else Elseif
  • 3.3 PHP Switch
  • 3.4 PHP Loops
  • 3.4.1 While Loop
  • 3.4.2 Do While Loop
  • 3.4.3 For Loop
  • 3.4.4 Foreach Loop
  • 3.4.5 Break/Continue
  • 3.5 PHP Functions
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  • 4.1 PHP Arrays
  • 4.1.1 Indexed Arrays
  • 4.1.2 Associative Arrays
  • 4.1.3 Multidimensional Arrays
  • 4.1.4 Sorting Arrays
  • 4.2 PHP Superglobals
  • 4.2.1 $GLOBALS
  • 4.2.2 $_SERVER
  • 4.2.3 $_REQUEST
  • 4.2.4 $_POST
  • 4.2.5 $_GET
  • 4.3 PHP RegEx
    •
  • 5.1 PHP Form Handling
  • 5.2 PHP Form Validation
  • 5.3 PHP Form Required
  • 5.4 PHP Form URL / E-mail
  • 5.5 PHP Form Complete
    •
  • 6.1 PHP Date and Time
  • 6.2 PHP Include Files
  • 6.3 PHP File Handling
  • 6.4 PHP File Open/Read
  • 6.5 PHP File Create/Write
  • 6.6 PHP File Upload
  • 6.7 PHP Cookies
  • 6.8 PHP Sessions
  • 6.9 PHP Filters
  • 6.10 PHP Filters Advanced
  • 6.11 PHP Callback Functions
  • 6.12 PHP JSON
  • 6.13 PHP Exceptions
    •
  • 7.1 PHP What is OOP
  • 7.2 PHP Classes / Objects
  • 7.3 PHP Constructor
  • 7.4 PHP Destructor
  • 7.5 PHP Access Modifiers
  • 7.6 PHP Inheritance
  • 7.7 PHP Class Constants
  • 7.8 PHP Abstract Classes
  • 7.9 PHP Interfaces
  • 7.10 PHP Traits
  • 7.11 PHP Static Methods
  • 7.12 PHP Static Properties
  • 7.13 PHP Namespaces
  • 7.14 PHP Iterables
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  • 8.1 MySQL Database
  • 8.2 MySQL Connect
  • 8.3 MySQL Create DB
  • 8.4 MySQL Create Table
  • 8.5 MySQL Insert Data
  • 8.6 MySQL Get Last ID
  • 8.7 MySQL Insert Multiple
  • 8.8 MySQL Prepared
  • 8.9 MySQL Select Data
  • 8.10 MySQL Where
  • 8.11 MySQL Order By
  • 8.12 MySQL Delete Data
  • 8.13 MySQL Update Data
  • 8.14 MySQL Limit Data
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  • 9.1 PHP XML Parsers
  • 9.2 PHP SimpleXML Parser
  • 9.3 PHP SimpleXML - Get
  • 9.4 PHP XML Expat
  • 9.5 PHP XML DOM
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  • 10.1 AJAX Intro
  • 10.2 AJAX PHP
  • 10.3 AJAX Database
  • 10.4 AJAX XML
  • 10.5 AJAX Live Search
  • 10.6 AJAX Poll
  • My Poll
    •
    • Operators are used to perform operations on variables and values.
    • PHP divides the operators in the following groups:
      • Arithmetic operators
      • Assignment operators
      • Comparison operators
      • Increment/Decrement operators
      • Logical operators
      • String operators
      • Array operators
      • Conditional assignment operators

    PHP Arithmetic Operators

    The PHP arithmetic operators are used with numeric values to perform common arithmetical operations, such as addition, subtraction, multiplication etc

    Operator Name Example Result Show it
    + Addition $x + $y Sum of $x and $y Try it
    - Subtraction $x - $y Difference of $x and $y Try it
    * Multiplication $x * $y Product of $x and $y Try it
    / Division $x / $y Quotient of $x and $y Try it
    % Modulus $x % $y Remainder of $x divided by $y Try it
    ** Exponentiation $x ** $y Result of raising $x to the $y'th power Try it

    PHP Assignment Operators

    • The PHP assignment operators are used with numeric values to write a value to a variable.
    • The basic assignment operator in PHP is "=". It means that the left operand gets set to the value of the assignment expression on the right.
    Assignment Same as... Description Show it
    x = y x = y The left operand gets set to the value of the expression on the right Try it
    x += y x = x + y Addition Try it
    x -= y x = x - y Subtraction Try it
    x *= y x = x * y Multiplication Try it
    x /= y x = x / y Division Try it
    x %= y x = x % y Modulus Try it

    PHP Comparison Operators

    The PHP comparison operators are used to compare two values (number or string):

    Operator Name Example Result Show it
    == Equal $x == $y Returns true if $x is equal to $y Try it
    === Identical $x === $y Returns true if $x is equal to $y, and they are of the same type Try it
    != Not equal $x != $y Returns true if $x is not equal to $y Try it
    <> Not equal $x <> $y Returns true if $x is not equal to $y Try it
    !== Not identical $x !== $y Returns true if $x is not equal to $y, or they are not of the same type Try it
    > Greater than $x > $y Returns true if $x is greater than $y Try it
    < Less than $x < $y Returns true if $x is less than $y Try it
    >= Greater than or equal to $x >= $y Returns true if $x is greater than or equal to $y Try it
    <= Less than or equal to $x <= $y Returns true if $x is less than or equal to $y Try it
    <=> Spaceship $x <=> $y Returns an integer less than, equal to, or greater than zero, depending on if $x is less than, equal to, or greater than $y. Introduced in PHP 7. Try it

    PHP Increment / Decrement Operators

    • The PHP increment operators are used to increment a variable's value.
    • The PHP decrement operators are used to decrement a variable's value.
    Operator Name Description Show it
    ++$x Pre-increment Increments $x by one, then returns $x Try it
    $x++ Post-increment Returns $x, then increments $x by one Try it
    --$x Pre-decrement Decrements $x by one, then returns $x Try it
    $x-- Post-decrement Returns $x, then decrements $x by one Try it

    PHP Logical Operators

    The PHP logical operators are used to combine conditional statements.

    Operator Name Example Result Show it
    and And $x and $y True if both $x and $y are true Try it
    or Or $x or $y True if either $x or $y is true Try it
    xor Xor $x xor $y True if either $x or $y is true, but not both Try it
    && And $x && $y True if both $x and $y are true Try it
    || Or $x || $y True if either $x or $y is true Try it
    ! Not !$x True if $x is not true Try it

    PHP String Operators

    PHP has two operators that are specially designed for strings.

    Operator Name Example Result Show it
    . Concatenation $txt1 . $txt2 Concatenation of $txt1 and $txt2 Try it
    .= Concatenation assignment $txt1 .= $txt2 Appends $txt2 to $txt1 Try it

    PHP Array Operators

    The PHP array operators are used to compare arrays.

    Operator Name Example Result Show it
    + Union $x + $y Union of $x and $y Try it
    == Equality $x == $y Returns true if $x and $y have the same key/value pairs Try it
    === Identity $x === $y Returns true if $x and $y have the same key/value pairs in the same order and of the same types Try it
    != Inequality $x != $y Returns true if $x is not equal to $y Try it
    <> Inequality $x <> $y Returns true if $x is not equal to $y Try it
    !== Non-identity $x !== $y Returns true if $x is not identical to $y Try it

    PHP Conditional Assignment Operators

    The PHP conditional assignment operators are used to set a value depending on conditions:

    Operator Name Example Result Show it
    ?: Ternary $x = expr1 ? expr2 : expr3 Returns the value of $x.
    The value of $x is expr2 if expr1 = TRUE.
    The value of $x is expr3 if expr1 = FALSE    		 Try it
    ?? Null coalescing $x = expr1 ?? expr2 Returns the value of $x.
    The value of $x is expr1 if expr1 exists, and is not NULL.
    If expr1 does not exist, or is NULL, the value of $x is expr2.
    Introduced in PHP 7    		 Try it

    PHP Fundamentals course home
    Module 3. Operators and Loops

    Navigate this module
  • 3.1 PHP Operators
  • 3.2 PHP If Else Elseif
  • 3.3 PHP Switch
  • 3.4 PHP Loops
  • 3.4.1 While Loop
  • 3.4.2 Do While Loop
  • 3.4.3 For Loop
  • 3.4.4 Foreach Loop
  • 3.4.5 Break/Continue
  • 3.5 PHP Functions
    •

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    Module 3 quiz

    Example files created in this module:
    PHP Conditional Statements - The if Statement PHP Conditional Statements - The if...else Statement PHP Conditional Statements - The if...elseif...else Statement The PHP switch Statement PHP Loops - The PHP while Loop part 1 PHP Loops - The PHP while Loop part 2 PHP Loops - The PHP do...while Loop part 1 PHP Loops - The PHP do...while Loop part 2 PHP Loops - The PHP for Loop part 1 PHP Loops - The PHP for Loop part 2 PHP Loops - The PHP foreach Loop part 1 PHP Loops - The PHP foreach Loop part 2 PHP Loops - Break PHP Loops - Continue PHP Loops - Break in While Loop PHP Loops - Continue in While Loop PHP Functions - Create User Defined Function PHP Functions - Function Argument PHP Functions - Function with two Arguments PHP Functions - Default Argument Value PHP Functions - Returning values PHP Functions - Passing Arguments by Reference