Detailed explanation of how to use dynamic variables in php

This article mainly introduces the usage of dynamic variables in php. The examples analyze the related usage skills of dynamic variables in php. Friends in need can refer to the following

The examples of this article describe php Dynamic variable usage. 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 the

loop statement to output all the values ​​of each variable:

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

It is definitely not possible to output

<?php
echo "$my_pic_".$i;
?>

like this.

Query php dynamic variable usage and change it to

<?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;  
}
?>

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