PHP strtoupper() Function: Convert String to Uppercase

1 year ago
Emily Johnson
1 minute

The strtoupper function is used to convert all letters in a string to uppercase. Its syntax format is as follows:

strtoupper(string)

In this case, the parameter string is the string to be converted. The function will return a new string where all letters are converted to uppercase. For example:

$str = "hello world";
echo strtoupper($str); // 输出 HELLO WORLD

Note that this function does not modify the original string and instead returns a new string.

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