Implémentez la sortie de miroir de chaîne à l'aide de STRREV: Comment inverser l'ordre des chaînes par Strrev?

<span><span><span class="hljs-comment">// Exemple de code complet</span></span><span>
</span><span><span class="hljs-variable">$example</span></span><span> = </span><span><span class="hljs-string">"PHPMiroir de corde"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"original: "</span></span><span> . </span><span><span class="hljs-variable">$example</span></span><span> . PHP_EOL;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Renversement: "</span></span><span> . </span><span><span class="hljs-title function_ invoke__">strrev</span></span><span>(</span><span><span class="hljs-variable">$example</span></span><span>) . PHP_EOL; </span><span><span class="hljs-comment">// Notez qu&#39;il y aura des problèmes avec les caractères multi-octets</span></span><span>
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Dans les projets réels, si des chaînes de mulabyte sont impliquées, il est recommandé d'utiliser une fonction de chaîne multi -yte pour s'assurer que l'inversion est correcte.

 <span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">mb_strrev</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$string</span></span></span><span>, </span><span><span class="hljs-variable">$encoding</span></span><span> = </span><span><span class="hljs-string">'UTF-8'</span></span><span>) {
    </span><span><span class="hljs-variable">$length</span></span><span>   = </span><span><span class="hljs-title function_ invoke__">mb_strlen</span></span><span>(</span><span><span class="hljs-variable">$string</span></span><span>, </span><span><span class="hljs-variable">$encoding</span></span><span>);
    </span><span><span class="hljs-variable">$reversed</span></span><span> = </span><span><span class="hljs-string">''</span></span><span>;
    </span><span><span class="hljs-keyword">while</span></span><span> (</span><span><span class="hljs-variable">$length</span></span><span>-- &gt; </span><span><span class="hljs-number">0</span></span><span>) {
        </span><span><span class="hljs-variable">$reversed</span></span><span> .= </span><span><span class="hljs-title function_ invoke__">mb_substr</span></span><span>(</span><span><span class="hljs-variable">$string</span></span><span>, </span><span><span class="hljs-variable">$length</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-variable">$encoding</span></span><span>);
    }
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-variable">$reversed</span></span><span>;
}

</span><span><span class="hljs-variable">$mbExample</span></span><span> = </span><span><span class="hljs-string">"PHPMiroir de corde"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"多字节Renversement: "</span></span><span> . </span><span><span class="hljs-title function_ invoke__">mb_strrev</span></span><span>(</span><span><span class="hljs-variable">$mbExample</span></span><span>) . PHP_EOL;
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De cette façon, vous pouvez inverser correctement les chaînes contenant des caractères multi-octets tels que le chinois pour obtenir une véritable sortie miroir.