strcspn

名稱:strcspn

分類:字符串

所屬語言:php

一句話介紹: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數。

實例

例子1

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

 <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>

親自試一試

例子2

使用所有的參數來輸出在字符串"Hello world!" 中找到字符"w" 之前查找的字符數：

 <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">// 開始位置是0，搜索字符串的長度是6。</span>
<span class="token delimiter important">?></span></span>

親自試一試