The syntax for a function is:
Function definition method
Copy code The code is as follows:
function "function_name" ( arg1, arg2...)
{
[code to execute]
return [final_result];
}
where [final_result] is usually a variable returned from a function value.
Let’s see an example
Copy the code The code is as follows:
function double_this_number($input_number)
{
return $input_number*2;
}
Call method
Copy code The code is as follows:
$x = 10;
$y = double_this_number($x);
print $y;
The output value is
10
Good , let’s look at a more complicated function usage method
Copy code The code is as follows:
function safePost($v=0 )
{
if( $v==0 )
{
$protected = array("_GET", "_POST", "_SERVER", "_COOKIE", "_FILES", "_ENV ", "GLOBALS");
foreach($protected as $var) {
if(isset($_REQUEST[$var]) || isset($_FILES[$var]))
{
die("Access denied");
}
}
}
}
Call method
safePost();
This is optional Define parameters, because $v==0 is set with a parameter by default, which is very helpful for function expansion.
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