Web Reference: Returns string with all ASCII alphabetic characters converted to uppercase. Bytes in the range "a" (0x61) to "z" (0x7a) will be converted to the corresponding uppercase letter by subtracting 32 from each byte value. Convert all characters to uppercase: echo strtoupper ("Hello WORLD!"); The strtoupper () function converts a string to uppercase. Note: This function is binary-safe. Related functions: Required. Specifies the string to convert. In this tutorial, you'll learn how to use the PHP strtoupper () function to convert all alphabetic characters of a string to uppercase.
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