Explain some of the PHP string functions?
PHP String Function Examples
1) PHP strtolower() function
The strtolower() function returns string in lowercase letter.
Syntax
string strtolower ( string $string )
Example
<?php $str="My name is KHAN"; $str=strtolower($str); echo $str; ?>
Output:
my name is khan
2) PHP strtoupper() function
The strtoupper() function returns string in uppercase letter.
Syntax
string strtoupper ( string $string )
Example
<?php $str="My name is KHAN"; $str=strtoupper($str); echo $str; ?>
Output:
MY NAME IS KHAN
3) PHP ucfirst() function
The ucfirst() function returns string converting first character into uppercase. It doesn't change the case of other characters.
Syntax
string ucfirst ( string $str )
Example
<?php
$str="my name is KHAN";
$str=ucfirst($str);
echo $str;
?>
Output:
My name is KHAN
4) PHP lcfirst() function
The lcfirst() function returns string converting first character into lowercase. It doesn't change the case of other characters.
Syntax
string lcfirst ( string $str )
Example
<?php
$str="MY name IS KHAN";
$str=lcfirst($str);
echo $str;
?>
Output:
mY name IS KHAN
5) PHP ucwords() function
The ucwords() function returns string converting first character of each word into uppercase.
Syntax
string ucwords ( string $str )
Example
<?php $str="my name is Sonoo jaiswal"; $str=ucwords($str); echo $str; ?>
Output:
My Name Is Sonoo Jaiswal
6) PHP strrev() function
The strrev() function returns reversed string.
Syntax
string strrev ( string $string )
Example
<?php
$str="my name is Sonoo jaiswal";
$str=strrev($str);
echo $str;
?>
Output:
lawsiaj oonoS si eman ym
7) PHP strlen() function
The strlen() function returns length of the string.
Syntax
int strlen ( string $string )
Example
<?php $str="my name is Sonoo jaiswal"; $str=strlen($str); echo $str; ?>
Output:
24