How to convert English lowercase to uppercase in php

php method to convert English lowercase to uppercase: first create a new "test.php" file; then create the code "$str = strtoupper($str)" in the file; finally run " localhost/test.php".

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##php Method to convert English primary school to uppercase:

Function introduction:

Related functions:

lcfirst() - Convert the first character in the string to lowercase
strtolower() - Convert the string to lowercase
ucfirst() - Convert the string to lowercase Convert the first character in the string to uppercase
ucwords() - Convert the first character of each word in the string to uppercase

strtoupper(string)

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