![]() Returns a string with all the characters of str converted to lowercase. $uppercase("Hello World") => "HELLO WORLD".An error is thrown if str is not a string. this function is invoked with no arguments), then the context value is used as the value of str. Returns a string with all the characters of str converted to uppercase. $substringAfter("Hello World", " ") => "World".An error is thrown if str and chars are not strings. If str does not contain chars, then it returns str. ![]() this function is invoked with only one argument), then the context value is used as the value of str. Returns the substring after the first occurrence of the character sequence chars in str.
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