What is the usage of php return

php return usage: 1. Return an expression result through the "return expression" syntax; 2. Use the "return(expr)" syntax to return a function expression; 3. Use return to return the value directly.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

Basic usage:

a), return expression // Return an expression result

b), return(expr) // Function expression Formula

c), return // Return directly, or return a null value

Note: It is best not to use return($val).

1. If return is executed, the content after the return statement will not be executed;

function add($a,$b){
 return $a+$b;
 return $a*$b;
}

$c = add(5,3);//The obtained $c value Can be used elsewhere in the program.

echo $c;

Output result: 8, only $a $b is executed, $a*$b is not executed.

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2. Return can be a function return value or a null value, depending on the specific usage, for example :

function test($a){
if($a>10){
 return "a>10";
}else{
 return "a<10";
}
$b=45;
$c=$b-$a;
echo $c;
}

In this example, when you call this function and give it any number, it will return a string, and the code:

$b=45;
$c=$b-$a;
echo $c;

will never be implement.

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