This article mainly introduces the difference between passing values and passing references in calling PHP. It has certain reference value. Now I share it with everyone. Friends in need can refer to it
#Daniel’s explanation:
Passing value : Same as copy. [For example, I have a house. I give you building materials. You build a house that is exactly the same as mine. Whatever you do in your house will not affect me. I will do it in mine. Whatever happens in the house will not affect you, they are independent of each other. 】
view plain copy
<?php $testa=1; //定义变量a $testb=2; //定义变量b $testb = $testa; //变量a赋值给变量b echo $testb; //显示为1 ?>
Pass reference : Similar to pointers in C language, it feels almost the same. For example, I have a house. If I give you a key, both of us can enter the house. Whatever you do in the house will affect me.
copy
<?php $param2=1; //定义变量2 $param1 = &$param2; //将变量2的引用传给变量1 echo $param2; //显示为1 $param1 = 2; //把2赋值给变量1 echo $param2; //显示为2 ?>
##Please indicate the source for reprinting https://blog.csdn.net/qq_28194557/article/details/70543753
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