What Do I Need?

To start using PHP, you can:

  • Find a web host with PHP and MySQL support
  • Install a web server on your own PC, and then install PHP and MySQL

What Can PHP Do?

  • PHP can generate dynamic page content
  • PHP can create, open, read, write, and close files on the server
  • PHP can collect form data
  • PHP can send and receive cookies
  • PHP can add, delete, modify data in your database
  • PHP can restrict users to access some pages on your website
  • PHP can encrypt data

What is a PHP File?

  • PHP files can contain text, HTML, JavaScript code, and PHP code
  • PHP code are executed on the server, and the result is returned to the browser as plain HTML
  • PHP files have a default file extension of “.php”

What is PHP?

  • PHP stands for PHP: Hypertext Preprocessor
  • PHP is a widely-used, open source scripting language
  • PHP scripts are executed on the server
  • PHP is free to download and use

Create a PHP Function

A function will be executed by a call to the function.

Syntax

function functionName()
{
code to be executed;
}

Example

A simple function that writes my name when it is called:

<html>
<body>

<?php
function writeName()
{
echo “Kai Jim Refsnes”;
}

echo “My name is “;
writeName();
?>

</body>
</html>

php Date Function

date()
date — Format a local time/date
string date ( string $format [, int $timestamp = time() ] )
format

  • d Day of the month, 2 digits with leading zeros 01 to 31
    D A textual representation of a day, three letters Mon through Sun
    j Day of the month without leading zeros 1 to 31
    l (lowercase ‘L’) A full textual representation of the day of the week Sunday through Saturday
    N ISO-8601 numeric representation of the day of the week (added in PHP 5.1.0) 1 (for Monday) through 7 (for Sunday)
    S English ordinal suffix for the day of the month, 2 characters st, nd, rd or th. Works well with j
    w Numeric representation of the day of the week 0 (for Sunday) through 6 (for Saturday)
    z The day of the year (starting from 0) 0 through 365
    Week
    W ISO-8601 week number of year, weeks starting on Monday (added in PHP 4.1.0) Example: 42 (the 42nd week in the year)
    Month
    F A full textual representation of a month, such as January or March January through December
    m Numeric representation of a month, with leading zeros 01 through 12
    M A short textual representation of a month, three letters Jan through Dec
    n Numeric representation of a month, without leading zeros 1 through 12
    t Number of days in the given month 28 through 31
    Year
    L Whether it’s a leap year 1 if it is a leap year, 0 otherwise.
    o ISO-8601 year number. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. (added in PHP 5.1.0) Examples: 1999 or 2003
    Y A full numeric representation of a year, 4 digits Examples: 1999 or 2003
    y A two digit representation of a year Examples: 99 or 03
    Time
    a Lowercase Ante meridiem and Post meridiem am or pm
    A Uppercase Ante meridiem and Post meridiem AM or PM
    B Swatch Internet time 000 through 999
    g 12-hour format of an hour without leading zeros 1 through 12
    G 24-hour format of an hour without leading zeros 0 through 23
    h 12-hour format of an hour with leading zeros 01 through 12
    H 24-hour format of an hour with leading zeros 00 through 23
    i Minutes with leading zeros 00 to 59
    s Seconds, with leading zeros 00 through 59
    u Microseconds (added in PHP 5.2.2). Note that date() will always generate 000000 since it takes an integer parameter, whereas DateTime::format() does support microseconds. Example: 654321
    Timezone
    e Timezone identifier (added in PHP 5.1.0) Examples: UTC, GMT, Atlantic/Azores
    I (capital i) Whether or not the date is in daylight saving time 1 if Daylight Saving Time, 0 otherwise.
    O Difference to Greenwich time (GMT) in hours Example: +0200
    P Difference to Greenwich time (GMT) with colon between hours and minutes (added in PHP 5.1.3) Example: +02:00
    T Timezone abbreviation Examples: EST, MDT
    Z Timezone offset in seconds. The offset for timezones west of UTC is always negative, and for those east of UTC is always positive. -43200 through 50400
    Full Date/Time
    c ISO 8601 date (added in PHP 5) 2004-02-12T15:19:21+00:00
    r » RFC 2822 formatted date Example: Thu, 21 Dec 2000 16:01:07 +0200