How to convert to lowercase letters in php

In PHP, you can use the strtolower() function to convert letters to lowercase, the syntax is "strtolower(string)". The strtolower() function converts all alphabetic characters in a string to lowercase and returns them.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

strtolower function: This function will pass in the characters All characters in string parameters are converted to lowercase.

<?php
  $str = "I want To FLY";
  $str = strtolower($str);
  echo $str;
//by www.jb51.net
?>

Output:

i want to fly

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