Dynamic variable usage examples in php, php variable usage examples_PHP tutorial

Examples of dynamic variable usage in php, php variable usage examples

The examples in this article describe the usage of dynamic variables in php. Share it with everyone for your reference. The specific analysis is as follows:

Fixed variables defined by

:

$my_pic_1=$row["pic_1"];
$my_pic_2=$row["pic_2"];
$my_pic_3=$row["pic_3"];
$my_pic_4=$row["pic_4"];
$my_pic_5=$row["pic_5"];
$my_pic_6=$row["pic_6"];
$my_pic_7=$row["pic_7"];
$my_pic_8=$row["pic_8"];

Here we use a loop statement to output all the values ​​of each variable:

<&#63;php
for ($i=1;$i<=8;$i++)
{ 
 echo "$my_pic_".$i; 
}
&#63;> 

Output like this

<&#63;php
echo "$my_pic_".$i;
&#63;>

That’s definitely not possible.

Query the usage of php dynamic variables and change it to

<&#63;php
for ($i=1;$i<=8;$i++){
  $my_pic_var="$my_pic".$i; //定义变量名  
  echo $$my_pic_var; //获得变量名$my_pic_var的值$$my_pic_var; 
  //PHP的原理是这样的 $my_pic_var="$my_pic_1"定义变量值
  //$$my_pic_var等于读取$my_pic_1的值;  
}
&#63;>

I hope this article will be helpful to everyone’s PHP programming design.

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