php中动态变量用法实例_php技巧
本文实例讲述了php中动态变量用法。分享给大家供大家参考。具体分析如下:
定义的固定变量:
$my_pic_1=$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"];
这里我们用循环语句把每个变量的值全部输出来:
<?php for ($i=1;$i<=8;$i++) { echo "$my_pic_".$i; } ?>
这样输出
<?php echo "$my_pic_".$i; ?>
肯定是不行的。
查询php动态变量用法后改成
<?php for ($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; } ?>
希望本文所述对大家的php程序设计有所帮助。

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