strspn

Calculate the length of the first substring in which all characters in the string exist in the specified character set

Name:strspn

Category:String

Programming Language:php

One-line Description:Returns the number of specific characters contained in the string.

Example

Example 1

Returns the number of characters "kHlleo" contained in the string "Hello world!":

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

Try it yourself

Example 2

Returns the number of characters "abc" contained in the string "abcdefand":

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token function">strspn</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"abcdefand"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"abc"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

Try it yourself