PHP Variables
PHP Data Types
PHP Echo & Print
PHP Strings
PHP Numbers
PHP Constants
PHP Operators
PHP if...else...elseif Statements
Switch Statement
PHP Loops
PHP Arrays
Superglobals
PHP Coding Standards
PHP Form Handling
PHP Form Validation
PHP URLs Validation
PHP Form Required Validation
Complete Form Example
PHP File Functions Open/Read
PHP File Create/Write
PHP File Upload
PHP Cookies Handling
PHP Session Handling
PHP filter_var() Function
PHP Validation Filters
PHP Sanitization Filters
Using Filters
Filters Advanced
JSON
PHP Date and Time
MySQL Database
MySQL Connect
MySQL Commands-Creating a Table
MySQL Commands-Inserting The data
MySQL Commands-Prepared Statement
MySQL Commands-Selecting The Data
MySQL Commands-Where and Order By
MySQL Commands-Deleting And Updating The Data
PHP-OOP Introduction
PHP-Classes/Objects
PHP-Constructor/Destructor
PHP-Access Modifiers
PHP-Inheritance
PHP-Inheritance and Protected Access Modifier
PHP-Overriding Inherited Methods
PHP-Final keyword
PHP-Abstract Classes
PHP-Constants
PHP-Traits
PHP-Static Methods and Properties
Introduction to Functions
Defining A function
Returning Values From A Function
Dynamic Function Calls
Variable Scope
Understanding Arguments Or Parameters
Testing For A Function Existence
Returning Multiple Values From A Function
Making practical Use By Building Code Libraries For Code Re-usability
Using Include() And Require()
Let us see usage of some filters via examples:
1. FILTER_SANITIZE_STRING
$string = "
Hello World!
";
$text = filter_var($string, FILTER_SANITIZE_STRING);
echo $text;
?>
Output will remove the HTML tags from the string.
2. FILTER_VALIDATE_INT
$num = 100;
if (!filter_var($num, FILTER_VALIDATE_INT) === false) {
echo("Valid Integer");
} else {
echo("Integer is not valid");
}
?>
The above code will check if the value is integer or not and the output will be: Valid Integer. But if we set the $num value to 0, this function will return Integer is not valid. To solve this error, use the below code.
$num = 0;
if (filter_var($num, FILTER_VALIDATE_INT) === 0 || !filter_var($num, FILTER_VALIDATE_INT) === false) {
echo("Valid Integer");
} else {
echo("Integer is not valid");
}
?>
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