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1. www.php.net › manual › enPHP: ctype_upper - Manual

   www.php.net › manual › en

   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)

2. www.w3schools.com › c › ref_ctype_toupperC ctype toupper () Function - W3Schools

   www.w3schools.com › c › ref_ctype_toupper

   Definition and Usage The toupper() function returns the ASCII value of an uppercase version of the character. If the character is not an uppercase character then its value is returned without being changed. The toupper() function is defined in the <ctype.h> header file.

3. www.tutorialspoint.com › php › php_function_ctypePHP ctype_upper Function - Online Tutorials Library

   www.tutorialspoint.com › php › php_function_ctype

   • Return Value
   • Example 1
   • Example 2
   • Example 3

   This function returns "true" if every character in the text is a uppercase letter, and "false" otherwise.

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   If every character in the provided string (or text) is a uppercase letter, the PHP ctype_upper()function returns true −

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   If every character in the provided string (or text) is not a uppercase letter, the PHP ctype_upper() function returns false−

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   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 −

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4. www.geeksforgeeks.org › php › php-ctype_upper-functionPHP | ctype_upper() Function - GeeksforGeeks

   www.geeksforgeeks.org › php › php-ctype_upper-function

   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.

5. www.bomberbot.com › php › the-php-ctype_upperThe PHP ctype_upper () Function: An In-Depth Analysis

   www.bomberbot.com › php › the-php-ctype_upper

   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.

6. www.educative.io › answers › what-is-the-ctypeupperWhat is the ctype_upper method in PHP? - Educative

   www.educative.io › answers › what-is-the-ctypeupper

   What is the ctype_upper method in PHP? The ctype_upper method can be used to check if all the text characters are in uppercase alphabetical characters. The uppercase alphabetical characters include A-Z.

7. People also ask

   What is toupper() function in C Ctype library?

   • ❮ C ctype Library The toupper() function returns the ASCII value of an uppercase version of the character. If the character is not an uppercase character then its value is returned without being changed. The toupper() function is defined in the header file. Required. The ASCII value of a character or an actual character

   C ctype toupper () Function - W3Schools

   www.w3schools.com/c/ref_ctype_toupper.php

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   What does Ctype_upper do?

   • ctype_upper — Check for uppercase character (s) Checks if all of the characters in the provided string, text, are uppercase characters. The tested string.

   PHP: ctype_upper - Manual

   www.php.net/manual/en/function.ctype-upper.php

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   Does test12345 have all uppercase characters?

   • This function checks if all of the characters in the provided string, text, are uppercase characters. The tested string. It returns TRUE if every character in text is an uppercase letter in the current locale. test12345 does not have all uppercase letters. ABCEFG consists of all uppercase letters.

   PHP - Function ctype_upper() | Tutorialspoint

   www.tutorialspoint.com/php/php_function_ctype_upper.htm

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   How do I check if a string is uppercase?

   • Checks if all of the characters in the provided string, text, are uppercase characters. The tested string. If an int between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range).

   PHP: ctype_upper - Manual

   www.php.net/manual/en/function.ctype-upper.php

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8. onlinephp.io › ctype-upper › examplesctype_upper - Examples - OnlinePHP.io

   onlinephp.io › ctype-upper › examples

   Examples of ctype_upper. Info and examples on ctype_upper PHP Function