settype

实例

将变量转换为特定类型：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$a</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"32"</span><span class="token punctuation">;</span> <span class="token comment">// string</span>
<span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$a</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"integer"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// $a 现在是整数</span>

<span class="token variable">$b</span> <span class="token operator">=</span> <span class="token number">32</span><span class="token punctuation">;</span> <span class="token comment">// integer</span>
<span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$b</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"string"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// $b 现在是字符串 </span>

<span class="token variable">$c</span> <span class="token operator">=</span> <span class="token constant boolean">true</span><span class="token punctuation">;</span> <span class="token comment">// boolean</span>
<span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$c</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"integer"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// $c 现在是整数 (1)</span>
<span class="token delimiter important">?></span></span>

亲自试一试