sha1_file

名前:sha1_file

カテゴリ:弦

対応言語:php

一言説明:ファイルのSHA-1ハッシュを計算します。

例

例1

テキストファイル「test.txt」のsha-1ハッシュを計算します：

 <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>

上記のコードの出力：

 AAF4C61DDCC5E8A2DABEDE0F3B482CD9AEA9434D

例2

ファイルに「test.txt」のsha-1ハッシュを保存します。

 <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>

「test.txt」が変更されたかどうかをテストします（つまり、SHA-1が変更されたかどうか）：

 <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">エコー</span><span class="token string double-quoted-string">「ファイルは大丈夫です。」</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token keyword">それ以外</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">エコー</span><span class="token string double-quoted-string">「ファイルが変更されました。」</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token delimiter important">？></span></span>

上記のコードの出力：