is_object

实例

检查变量是否为对象：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">function</span> <span class="token function-definition function">get_cars</span><span class="token punctuation">(</span><span class="token variable">$obj</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">is_object</span><span class="token punctuation">(</span><span class="token variable">$obj</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token constant boolean">false</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token variable">$obj</span><span class="token operator">-></span><span class="token property">cars</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token variable">$obj</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$obj</span><span class="token operator">-></span><span class="token property">cars</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Volvo"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"BMW"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"Audi"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">get_cars</span><span class="token punctuation">(</span><span class="token constant">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">get_cars</span><span class="token punctuation">(</span><span class="token variable">$obj</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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