How to convert string to lowercase in php

php case conversion

1. Convert the string to lowercase

strtolower();: This function converts all characters of the incoming string parameter into lowercase and puts them back into the string in lowercase.
Example:

<?php    
$str = "I want To FLY";    
$str = strtolower($str);    
echo $str;
?>

Output result:

i want to fly

2. Convert characters to uppercase

strtoupper();: The function of this function is opposite to the strtolower function. It converts all the characters of the passed character parameter into uppercase and returns this in uppercase. String. The usage is the same as strtolower();.

Two very useful methods.

3. Convert the first character of the string to uppercase

ucfirst(); : The function of this function is to change the first character of the string to uppercase. This function returns the string with the first character uppercase. The usage is the same as strtolower();.

4. Change each word of the string Convert the first character of each word to uppercase

ucwords();: This function converts the first character of each word in the passed string to uppercase. For example, "hello world" will be returned after processing by this function "Hello Word". The usage is the same as strtolower();.

Recommended tutorial: "PHP Tutorial"

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