Zend Anwar

What is ucfirst, ucwords, lcfirst, strtolower, strtoupper function in php?

 ucfirst : Make a string’s first character uppercase

<?php
$var = ‘anwar hossain!’;
$var = ucfirst($var);             // Anwar hossain!

$bar = ‘HELLO WORLD!’;
$bar = ucfirst($bar);             // HELLO WORLD!
$bar = ucfirst(strtolower($bar)); // Hello world!
?>

ucwords : Uppercase the first character of each word in a string.

<?php
$var = ‘anwar hossain!’;
$var = ucwords($var);             // Anwar Hossain!

$bar = ‘HELLO WORLD!’;
$bar = ucwords($bar);             // HELLO WORLD!
$bar = ucwords(strtolower($bar)); // Hello World!
?>

lcfirst : Make a string’s first character lowercase.

<?php
$var = ‘AnwarHossain!’;
$var =  lcfirst($var);             // anwarHossain!

$bar = ‘HELLO WORLD!’;
$bar = lcfirst($bar);             // hELLO WORLD!
$bar = lcfirst(strtoupper($bar));  // hELLO WORLD!
?>

strtoupper : Make a string uppercase.

<?php
$string = “Anwar is a good boy”;
$string = strtoupper($string);
echo $string; // Output :  ANWAR IS A GOOD BOY
?>

strtolower : Make a string lowercase.

<?php
$string = “ANWAR IS A GOOD BOY”;
$string = strtolower($string);
echo $string; // Output :  anwar is a good boy
?>