filter_input
通过名称获取特定的外部变量，并且可以通过过滤器处理它
简体中文
简体中文
在本例中，我们使用 filter_input() 函数来过滤一个 POST 变量。所接受的 POST 变量是合法的 e-mail 地址。
<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function"></span><mark><span class="token function">filter_input</span><span class="token punctuation">(</span><span class="token constant">INPUT_POST</span><span class="token punctuation">,</span> <span class="token string single-quoted-string">'email'</span><span class="token punctuation">,</span> <span class="token constant">FILTER_VALIDATE_EMAIL</span><span class="token punctuation">)</span></mark><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">"E-Mail is not valid"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">else</span>
<span class="token punctuation">{</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"E-Mail is valid"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token delimiter important">?></span></span>
输出类似：
E-Mail is valid
filter_input_array
filter_input
filter_list
filter_id
filter_var_array
filter_var
filter_has_var
