crc32

实例

例子 1

输出 crc32() 的结果：

<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>

亲自试一试

例子 2

在本实例中，我们将在使用以及不使用 "%u" 格式符的情况下，输出 crc32() 的结果（注意结果是相同的）：

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

以上代码的输出：

Without %u: 461707669
With %u: 461707669

例子 3

在本实例中，我们将在使用以及不使用 "%u" 格式符的情况下，输出 crc32() 的结果（注意结果是不相同的）：

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

以上代码的输出：

Without %u: -1959132156
With %u: 2335835140