Functions
The beautiful of PHP is the functions of PHP. Come to the
types of functions ,
Types of PHP functions, we dividing here
1)User Defined functions
2)PHP In-built Functions.
a)
frequently used functions
b)
less-frequently used functions
1)User Defined Functions
You can defined your function according to your use
Syntax:
// without passing argument
function myfunction()
{
echo “hello , I am in function
without arguments”;
}
myfunction(); // calling the function
Outut :
Hello , I am in function without
arguments
// function with argument passing
function myfunction($var)
{
return “hello ”.$var. “ Welcome in function with
arguments“;
}
myfunction(“softfive”); // Calling
You can call by following
methods-
i.
myfunction(“softfive”);
ii.
myfunction($var=”softfive”);
iii.
myfunction($var); // pass the value of $var
2)PHP In-built Functions.
a)
frequently used functions
b)
less-frequently used functions
a) frequently used functions
$var=”hello”;
strtolower($var); //
output “hello” (used for the lower case letters)
strtoupper($var); //
output “HELLO” (used for the upper case letters)
md5($var); // to find hash
md5_file($file); //
to file the hash of content of a file
sha1($var); // to
find sha
substr($var,0,3);
//output “hel”
strlen($var); //
calculates the length of a string
trim(“
hello”); // output “hello” (reduces white spaces)
str_replace(“ “,”-“,”hello world”); // output “hello-world”
strcmp(“hello”,”hello”);
// returns true
ucwords($var); //
output “Hello”
date(“Y-m-d”); // returns the date
date(“Y-m-d H:i:s”); // returns the timestamp
b)less-frequently used functions
print_r($array); // prints the array value (mostly used for
debugging purpose)
strrev($var);
// output “olleh”
print // to print
echo // to print
require(//file path); // to include a file
require_once(//file path); // to include a file once
include(//file path); (Note
include gives warning where as require gives error)
there are so many function that are used lessely or rarely.
