The difference between PHP functions and C++ functions

The difference between PHP and C function processing methods is mainly reflected in: function signature: PHP has no type safety, and C has type safety. Function definition: PHP uses the function keyword to define, and C uses the data type keyword to define. Parameter passing: PHP passes by reference, and C can pass by value or reference. Return value: PHP uses the return statement to return the data type, and C uses the specified data type to return.

The difference between PHP functions and C functions

PHP and C are both popular programming languages, but in the way functions are processed There are big differences. This article will explore the main differences between the two language functions.

Function signature

• PHP: The PHP function signature specifies the function name, parameter list, and optional return value type. No type safety.
• C: The C function signature includes the function name, parameter type list, and return value type. Has type safety.

Function definition

• PHP: PHP functions are defined using the function keyword, followed by the function name and function body.
• C: C functions use data type keywords such as int(), float() or the auto key Word (C++11) definition, followed by the function name, parameter types, and function body.

Parameter passing

• PHP: PHP functions pass parameters by reference, which means changing the parameters within the function Also affects the original variables in the calling function.
• C: C functions can pass parameters by value or reference. Passing by value creates a copy of the argument, so changes within the function do not affect the original variable. Passing by reference provides direct access to the original variable.

Return value

• PHP: The PHP function uses the return statement to return a value, you can is any PHP data type.
• C : A C function returns a value using the same data type specified in the function signature. References or pointers can also be returned.

Practical case

PHP function:

function sum(int $a, int $b): int {
  return $a + $b;
}

C function:

int sum(int a, int b) {
  return a + b;
}

Conclusion:

The main difference between PHP functions and C functions is reflected in function signature, definition, parameter passing and return value processing. PHP uses pass-by-reference and no type safety for its functions, while C uses type safety and provides pass-by-value and pass-by-reference options.

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