doubleval

名称:doubleval

分类:变量处理

所属语言:php

一句话介绍:floatval() 的别名。

实例

返回不同变量的浮点值：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$a</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"1234.56789"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">doubleval</span><span class="token punctuation">(</span><span class="token variable">$a</span><span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span>

<span class="token variable">$b</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"1234.56789Hello"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">doubleval</span><span class="token punctuation">(</span><span class="token variable">$b</span><span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span>

<span class="token variable">$c</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello1234.56789"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">doubleval</span><span class="token punctuation">(</span><span class="token variable">$c</span><span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

亲自试一试