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Which is the correct syntax of defining a default argument value in PHP?

104. Which is the correct syntax of defining a default argument value in PHP?

1. function function_name(type $argument_name : value) { /* function body*/ }
2. function function_name(type $argument_name , value) { /* function body*/ }
3. function function_name(type $argument_name = value) { /* function body*/ }
4. All of the above

Answer: C) function function_name(type $argument_name = value) { /* function body*/ }

Explanation:

The syntax of defining a default argument value in PHP is:

function function_name(type $argument_name = value) { 
/* function body*/ 
}