Detailed explanation of the usage of value transfer/reference transfer between PHP custom functions

php:Parameter transfer between functions

1. Value transfer

"; } $var1 = 1; echo $var1 . "
"; exam($var1); echo $var1 . "
"; ?>

------------------------------------------------ -------------------------------
Output results:
1
In Exam: 2
1
---------------------------------------------- ----------------------------------
2.QuoteTransfer

"; } $var1 = 1; echo $var1 . "
"; exam($var1); echo $var1 . "
"; ?>

----------------------------------------- ---------------------------------------------
Output result:
1
In Exam: 2
2
--------------------------------------------- ----------------------------------------
3.Yes Select parameter

function values($price, $tax=""){ $price += $prive * $tax; echo "Total Price:" . $price . "
"; } values(100, 0.25); values(100);

Output result:
Total Price: 125
Total Price: 100
------------------ -------------------------------------------------- -----------
4. If aobjectis passed in, the value of the object can be changed
(actuallyVariable$obj records the handle of this object. Passing $obj as a parameter can completely operate on the original object)

name = $name; $this->age = $age; $this->gander = $gander; } public function show_info(){ echo $this->name . " " . $this->age . " " . $this->gander . "
"; } } function grow($obj){ $obj->age++; } function test(){ $obj = new Obj("Mr. zhan", "12", "male"); $obj->show_info(); grow($obj); $obj->show_info(); grow($obj); $obj->show_info(); } test(); ?>

----------- -------------------------------------------------- ------------------
Output result:
Mr. zhan 12 male
Mr. zhan 13 male
Mr. zhan 14 male

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