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PHP Tutorial

PHP Introduction

PHP 5 Installation

PHP 5 Syntax

PHP 5 Variables

PHP 5 echo and print Statements

PHP 5 Data Types

PHP 5 String Functions

PHP 5 Constants

PHP Arithmetic Operators

PHP 5 if...else...elseif Statements

PHP 5 switch Statement

PHP 5 while Loops

PHP 5 for Loops

PHP 5 Functions

PHP 5 Arrays

PHP 5 Sorting Arrays

PHP 5 Superglobals

PHP Forms

PHP 5 Form Handling

PHP 5 Form Validation

PHP 5 Forms - Required Fields

PHP 5 Forms E-mail /URL

PHP Form Complete

PHP Advanced

PHP 5 Multidimensional Arrays

PHP 5 Date and Time

PHP Include Files

PHP File Handling

PHP File Open/Read

PHP File Create/Write

PHP File Upload

PHP Cookies

PHP Sessions

PHP E-mail

PHP Secure E-mails

PHP Error Handling

PHP Exception Handling

PHP Filter

PHP Database

PHP MySQL Introduction

PHP MySQL Connect

PHP Create DB/Tables

PHP MySQL Insert Into

PHP MySQL Select


PHP Order By

PHP Update

PHP Delete


PHP MySQL The Where Clause

The WHERE clause is used to filter records.

The WHERE clause

The WHERE clause is used to extract only those records that fulfill a specified criterion.


SELECT column_name(s)
FROM table_name
WHERE column_name operator value

To get PHP to execute the statement above we must use the mysqli_query() function. This function is used to send a query or command to a MySQL connection.


The following example selects all rows from the "Persons" table where "FirstName='Peter'":

// Check connection
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();

$result = mysqli_query($con,"SELECT * FROM Persons
WHERE FirstName='Peter'");

while($row = mysqli_fetch_array($result)) {
   echo $row['FirstName'] . " " . $row['LastName'];
   echo "<br>";

The output of the code above will be:

Peter Griffin