sha1_file

Example

Example 1

Calculate the SHA-1 hash of the text file "test.txt":

 <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>

Output of the above code:

 aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d

Example 2

Storing the SHA-1 hash of "test.txt" in the file:

 <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 whether "test.txt" has been modified (i.e. whether SHA-1 has been modified):

 <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>

Output of the above code:

 The file is ok.