php 可变变量的 Fatal error: Cannot use [] for reading

<code><span><?php </span><span>$nums</span> = <span>array</span>(<span>1</span>, <span>2</span>, <span>3</span>);
<span>$arr_name</span> = <span>'nums'</span>;
<span>$$arr_name</span>[] = <span>4</span>;
print_r(<span>$nums</span>);
<span>?></span></span></code>

执行上面程序会出现Fatal error: Cannot use [] for reading，因为语义模糊，要这样改：

<code><span><?php </span><span>$nums</span> = <span>array</span>(<span>1</span>, <span>2</span>, <span>3</span>);
<span>$arr_name</span> = <span>'nums'</span>;
${<span>$arr_name</span>}[] = <span>4</span>;
print_r(<span>$nums</span>);
<span>?></span></span></code>

以上就介绍了php 可变变量的 Fatal error: Cannot use [] for reading，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。