What is the function in PHP to convert uppercase letters to lowercase?

To convert uppercase letters to lowercase in PHP, you can use the strtolower() function. This function takes a string as input and returns the string with all uppercase letters converted to lowercase. This can be useful when you want to standardize the case of input data or when you need to compare strings in a case-insensitive manner. 

$string = "HELLO WORLD";
$lowercaseString = strtolower($string);
echo $lowercaseString; // Output: hello world

Keywords

php function strtolower uppercase lowercase

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