What is the use of ctype_upper() in PHP?

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The ctype_upper() function in PHP used to check EVERY and each and every personality of a given string is in uppercase or not. If the string in the top case then it RETURNS TRUE otherwise returns False. 99. What are the difference between self and $this in PHP?

self	$this
The “self” COMMAND can be used as a static function.	The $this command cannot be used as a static function.
Self:: is used to access class variables and other methods	The $this-> is used to access class variables and methods within.
It does not need an instantiated object.	It does need an instantiated object.

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What is the use of ctype_upper() in PHP?

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