PHP strtolower() Function

The strtolower() function is used to convert a string into lowercase. This function takes a string as parameter and converts all the uppercase english alphabets present in the string to lowercase. All other numeric characters or special characters in the string remains unchanged.

Syntax:

string strtolower( $string )

Parameters: The only parameter to this function is a string that is to be converted to lower case.

Return value: This function returns a string in which all the alphabets are lower case.

Examples:

Input : $str  = "w3wiki"
        strtolower($str)
Output: w3wiki

Input : $str  = "going BACK he SAW THIS 123$#%"
        strtolower($str)
Output: going back he saw this 123$#%

Below programs illustrate the strtolower() function in PHP:

Program 1:

<?php 
  
// Original string 
$str = "w3wiki"; 
  
// String converted to lower case 
$resStr = strtolower($str); 
  
print_r($resStr); 
  
?> 

Output:

w3wiki

Program 2:

<?php 
  
// Original string 
$str = "going BACK he SAW THIS 123$#%"; 
  
// String converted to lower case 
$resStr = strtolower($str); 
  
print_r($resStr); 
  
?> 

Output:

going back he saw this 123$#%

PHP is a server-side scripting language designed specifically for web development. You can learn PHP from the ground up by following this PHP Tutorial and PHP Examples.

Tags:

#PHP-function #PHP-string #PHP #Web Technologies

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