sha1_file

名稱:sha1_file

分類:字符串

所屬語言:php

一句話介紹:計算文件的SHA-1 散列。

實例

例子1

計算文本文件"test.txt" 的SHA-1 散列：

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$filename</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"test.txt"</span> <span class="token punctuation">;</span>
<span class="token variable">$sha1file</span> <span class="token operator">=</span> <span class="token function">sha1_file</span> <span class="token punctuation">(</span> <span class="token variable">$filename</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token variable">$sha1file</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

以上代碼的輸出：

 aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d

例子2

在文件中存儲"test.txt" 的SHA-1 散列：

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$sha1file</span> <span class="token operator">=</span> <span class="token function">sha1_file</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"test.txt"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">file_put_contents</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"sha1file.txt"</span> <span class="token punctuation">,</span> <span class="token variable">$sha1file</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

測試"test.txt" 是否已被修改（即SHA-1 是否已被修改）：

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$sha1file</span> <span class="token operator">=</span> <span class="token function">file_get_contents</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"sha1file.txt"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span> <span class="token function">sha1_file</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"test.txt"</span> <span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token variable">$sha1file</span> <span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">echo</span> <span class="token string double-quoted-string">"The file is ok."</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">"The file has been changed."</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token delimiter important">?></span></span>

以上代碼的輸出：