strcasecmp
二進制安全不區分大小寫的字符串比較
中文(繁體)
中文(繁體)
比較兩個字符串（不區分大小寫）：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">echo</span> <span class="token function">strcasecmp</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"shanghai"</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 delimiter important">?></span></span>
比較兩個字符串（不區分大小寫，HELLO 和hELLo 輸出相同）：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">echo</span> <span class="token function">strcasecmp</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Shanghai"</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 keyword">echo</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token function">strcasecmp</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Shanghai"</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 delimiter important">?></span></span>
不同的返回值：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">echo</span> <span class="token function">strcasecmp</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Hello world!"</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 comment">// 兩字符串相等</span> <span class="token keyword">echo</span> <span class="token function">strcasecmp</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Hello world!"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"HELLO"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span> <span class="token comment">// <i>string1</i>大於<i>string2</i></span> <span class="token keyword">echo</span> <span class="token function">strcasecmp</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Hello world!"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"HELLO WORLD! HELLO!"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span> <span class="token comment">// <i>string1</i>小於<i>string2</i></span> <span class="token delimiter important">?></span></span>
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