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See Also ¶ ctype_alpha () - Check for alphabetic character (s) ctype_lower () - Check for lowercase character (s) setlocale () - Set locale information IntlChar::isupper () - Check if code point has the general category "Lu" (uppercase letter)
Jul 11, 2025 · The ctype_upper () function in PHP used to check each and every character of a given string is in uppercase or not. If the string in upper case then it returns TRUE otherwise returns False.
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This function returns "true" if every character in the text is a uppercase letter, and "false" otherwise.
If every character in the provided string (or text) is a uppercase letter, the PHP ctype_upper()function returns true −
If every character in the provided string (or text) is not a uppercase letter, the PHP ctype_upper() function returns false−
Checking multiple strings (texts). In the example below, we create an array of a string containing multiple strings and, using the PHP ctype_upper()function to determine whether every character in strings is in uppercase −
Dec 31, 2023 · PHP ctype_upper () function: In this tutorial, we will learn about the PHP ctype_upper () function with its usage, syntax, parameters, return value, and examples.
À partir de PHP 8.1.0, passer un argument différent d'une chaîne est obsolète. À l'avenir, l'argument sera interprété comme une chaîne de caractères au lieu d'un point de code ASCII. Selon le comportement souhaité, l'argument doit être transtypé en chaîne de caractères ou un appel explicite à chr () doit être effectué.
Aug 15, 2025 · The ctype_upper() function is a valuable asset in the PHP developer's toolkit. Its simplicity, efficiency, and specific purpose make it ideal for many string validation tasks, particularly when working with data that must adhere to strict uppercase formatting rules.
Examples of ctype_upper. Info and examples on ctype_upper PHP Function
