strcspn

名称:strcspn

分类:字符串

所属语言:php

一句话介绍:返回在找到某些指定字符的任何部分之前，在字符串中查找的字符数。

实例

例子 1

输出在字符串 "Hello world!" 中找到字符 "w" 之前查找的字符数：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token function">strcspn</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">"w"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 2

使用所有的参数来输出在字符串 "Hello world!" 中找到字符 "w" 之前查找的字符数：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token function">strcspn</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">"w"</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">6</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 开始位置是 0，搜索字符串的长度是 6。</span>
<span class="token delimiter important">?></span></span>

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