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Which of the following are valid function names? 1. function[] 2. €[] 3. .function[] 4. $function[]
A. Only 2
B. None of the mentioned
C. All of the mentioned
D. 3 and 4
Answer: Option A
Solution[By Examveda Team]
Except a] others are invalid names. According to the specified regular expression [[a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*], a function name like this one is valid.
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Related Questions on Functions
A function may be defined using syntax such as the following:
Example #1 Pseudo code to demonstrate function uses
Any valid PHP code may appear inside a function, even other functions and class definitions.
Function names follow the same rules as other labels
in PHP. A valid function name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: ^[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*$.
Functions need not be defined before they are referenced, except when a function is conditionally defined as shown in the two examples below.
When a function is defined in a conditional manner such as the two examples shown. Its definition must be processed prior to being called.
Example #2 Conditional functions