What is the PHP function used to convert a string to lowercase?

To convert a string to lowercase in PHP, you can use the `strtolower()` function. This function takes a string as input and returns a new string with all characters converted to lowercase. This can be useful for standardizing input or output, as well as for case-insensitive comparisons. 

$string = "Hello World!";
$lowercaseString = strtolower($string);
echo $lowercaseString;

Keywords

php function strtolower string lowercase

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