String Functions are the built-in functions provided by PHP to operate and manipulate a string. PHP provides a number of string functions. Some of the MOST USED string functions are listed below:
SYNTAX | USES |
string strtolower ( string $string ) | It converts a string to lowercase letters |
string strtoupper ( string $string ) | It converts a string to uppercase letters |
string ucfirst ( string $str ) | It converts the first character of a string to uppercase |
string lcfirst ( string $str ) | It converts the first character of a string to lowercase |
string ucwords ( string $str ) | It converts the first character of each word in a string to uppercase |
string strrev ( string $string ) | It reverses a string |
int strlen ( string $string ) | It returns the length of a string |
Example:
<!DOCTYPE html> <html> <body> <?php $str="Hello World"; $str=strtolower($str); echo "$str <br>"; $str=strtoupper($str); echo "$str <br>"; $str=lcfirst($str); echo "$str <br>"; $str=strrev($str); echo "$str <br>"; $str=strlen($str); echo "$str <br>"; $str="hello World"; $str=ucfirst($str); echo "$str <br>"; $str="hello world"; $str=ucwords($str); echo "$str <br>"; ?> </body> </html> |
Output
hello world
HELLO WORLD
hELLO WORLD
DLROW OLLEh
11
Hello World
Hello World |