strripos
计算指定字符串在目标字符串中最后一次出现的位置(不区分大小写)
查找 "php" 在字符串中最后一次出现的位置:
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">echo</span> <span class="token function">strripos</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"You love php, I love php too!"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"PHP"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>