This article examples illustrate how php converts all strings into uppercase or lowercase. Share it for your reference. The specific analysis is as follows:
In PHP, you can convert all English characters in a string into lowercase or uppercase through two functions strtolower and strtoupper.
<?php
$string = "Learn PHP string functions at ";
$lower = strtolower($string);
$upper = strtoupper($string);
print("$lower\n");
print("$upper\n");
print("\n");
?>
The output result is as follows:
learn php string functions at LEARN PHP STRING FUNCTIONS AT
I hope this article will be helpful to everyone's PHP programming.