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:

The function of php to convert lowercase to uppercase is: strtoupper()

First create a new test.php file and add the following content:

<?php
  $str = "www.php.cn";
  $str = strtoupper($str);
  echo $str;
?>

Then run the file in the browser

Function introduction:

strtoupper() Function converts a string to uppercase.

Note: This function is binary safe.

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

Syntax:

strtoupper(string)

Parameters

string required. Specifies the string to be converted.

Return value: Returns the string converted to uppercase.

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