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Detailed explanation of value assignment in php

怪我咯
怪我咯Original
2017-07-16 10:03:121249browse

Assignment is the most commonly used basic knowledge point in PHP development. Assignment in PHP is divided into passing valueassignment and referenceassignment. Let’s take a look at it below. Look at the concept of assignment by value

Assignment by value: assigning the value of the actual parameter to the row parameter, then modification of the row parameter will not affect the value of the actual parameter.
For example: the root copy is the same. 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. What I do in my house will not affect me. Nothing will affect you, independent of each other.

<table width="620" align="center" border="0" cellpadding="1" cellspacing="1" style="background:#FB7"> <tr> <td width="464" height="27" bgcolor="#FFE7CE"> 代码如下</td> <td width="109" align="center" bgcolor="#FFE7CE" style="cursor:pointer;" onclick="doCopy(&#39;copy8116&#39;)">复制代码</td> </tr> <tr> <td height="auto" colspan="2" valign="top" bgcolor="#FFFFFF" style="padding:10px;" class="copyclass" id=copy8116>$aa=1;
$bb=2;
$aa=$bb;//$aa和$bb互不相干
$aa=3;
echo $aa,&#39;--&#39;,$bb;//输出3--2
</td> </tr> </table>

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