crc32

Example

Example 1

Output the result of crc32() :

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token function">crc32</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Shanghai"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">printf</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"%u\n"</span> <span class="token punctuation">,</span> <span class="token variable">$str</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

Try it yourself

Example 2

In this example, we will output the result of crc32() with and without the " %u " format (note that the result is the same):

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token function">crc32</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Hello world!"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">&#39;Without %u: &#39;</span> <span class="token operator">.</span> <span class="token variable">$str</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">&#39;With %u: &#39;</span> <span class="token punctuation">;</span>
<span class="token function">printf</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"%u"</span> <span class="token punctuation">,</span> <span class="token variable">$str</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

Output of the above code:

 Without %u: 461707669
With %u: 461707669

Example 3

In this example, we will output the result of crc32() with and without the " %u " format (note that the results are different):

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token function">crc32</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Hello world."</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">&#39;Without %u: &#39;</span> <span class="token operator">.</span> <span class="token variable">$str</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">&#39;With %u: &#39;</span> <span class="token punctuation">;</span>
<span class="token function">printf</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"%u"</span> <span class="token punctuation">,</span> <span class="token variable">$str</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

Output of the above code:

 Without %u: -1959132156
With %u: 2335835140