(PHP 5 >= 5.3.0, PHP 7, PHP 8)
lcfirst — Make a string's first character lowercase
   Returns a string with the first character of
   string lowercased if that character is
   an ASCII character in the range "A" (0x41) to
   "Z" (0x5a).
  
stringThe input string.
Returns the resulting string.
| Version | Description | 
|---|---|
| 8.2.0 | Case conversion no longer depends on the locale set with setlocale(). Only ASCII characters will be converted. | 
Example #1 lcfirst() example
<?php
$foo = 'HelloWorld';
echo lcfirst($foo), PHP_EOL;             // helloWorld
$bar = 'HELLO WORLD!';
echo lcfirst($bar), PHP_EOL;             // hELLO WORLD!
echo lcfirst(strtoupper($bar)), PHP_EOL; // hELLO WORLD!
?>