php 可變變數的 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></code>

執行上面程式會出現Fatal error: Cannot use [] for reading，因為語意模糊，要這樣改：

<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></code>

以上就介紹了php 可變變數的 Fatal error: Cannot use [] for reading，包括了方面的內容，希望對PHP教程有興趣的朋友有所幫助。