Quelle est la valeur de retour de la fonction set_include_path? Comment gérer les exceptions?

<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// Ce n&#39;est pas lié au contenu de l&#39;articlePHPExemple de code</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Voici quelques résultats non pertinents en haut de la page。"</span></span><span>;
</span><span><span class="hljs-meta">?&gt;</span></span><span>

&lt;hr&gt;

</span><span><span class="hljs-meta">&lt;?php</span></span><span>
<span class="hljs-comment">/**
 * set_include_pathQuelle est la valeur de retour de la fonction？Comment gérer les exceptions？
 *
 * existerPHPmilieu，set_include_pathLes fonctions sont utilisées pour définir le script actuelinclude_path，
 * C&#39;estPHPexister引入文件（commeincludeourequire）Liste des chemins de répertoire pour rechercher。
 *
 * Syntaxe de base：
 * set_include_path(string $new_include_path): string|false
 *
 * Valeur de retour：
 * - En cas de succès：retour**Avant modificationinclude_path**，C&#39;est调用前de原始值。
 * - Quand l&#39;échec：retour**false**。
 *
 * Exemple：
 */</span>

</span><span><span class="hljs-variable">$originalPath</span></span><span> = </span><span><span class="hljs-title function_ invoke__">get_include_path</span></span><span>();
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Avant modificationinclude_path: <span class="hljs-subst">$originalPath</span></span></span><span>&lt;br&gt;";

</span><span><span class="hljs-variable">$newPath</span></span><span> = </span><span><span class="hljs-string">'/var/www/html/includes'</span></span><span>;
</span><span><span class="hljs-variable">$result</span></span><span> = </span><span><span class="hljs-title function_ invoke__">set_include_path</span></span><span>(</span><span><span class="hljs-variable">$newPath</span></span><span>);

</span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable">$result</span></span><span> === </span><span><span class="hljs-literal">false</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"installationinclude_pathéchouer！&lt;br&gt;"</span></span><span>;
} </span><span><span class="hljs-keyword">else</span></span><span> {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"installationinclude_pathsuccès，Le chemin d&#39;origine est: <span class="hljs-subst">$result</span></span></span><span>&lt;br&gt;";
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"actuelinclude_pathpour: "</span></span><span> . </span><span><span class="hljs-title function_ invoke__">get_include_path</span></span><span>() . </span><span><span class="hljs-string">"&lt;br&gt;"</span></span><span>;
}

<span class="hljs-comment">/**
 * Gestion des exceptions
 *
 * PHPdeset_include_pathLa fonction elle-même ne lance pas des exceptions，它只retour布尔值。
 * donc，常见de做法是通过判断Valeur de retour来处理可能de错误。
 *
 * comme果想用异常机制，Peut être emballé manuellement：
 */</span>

</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">safe_set_include_path</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$path</span></span></span><span>) {
    </span><span><span class="hljs-variable">$result</span></span><span> = </span><span><span class="hljs-title function_ invoke__">set_include_path</span></span><span>(</span><span><span class="hljs-variable">$path</span></span><span>);
    </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable">$result</span></span><span> === </span><span><span class="hljs-literal">false</span></span><span>) {
        </span><span><span class="hljs-keyword">throw</span></span><span> </span><span><span class="hljs-keyword">new</span></span><span> </span><span><span class="hljs-built_in">Exception</span></span><span>(</span><span><span class="hljs-string">"installationinclude_pathéchouer，Essayez le chemin: <span class="hljs-subst">$path</span></span></span><span>");
    }
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-variable">$result</span></span><span>;
}

</span><span><span class="hljs-keyword">try</span></span><span> {
    </span><span><span class="hljs-variable">$previous</span></span><span> = </span><span><span class="hljs-title function_ invoke__">safe_set_include_path</span></span><span>(</span><span><span class="hljs-string">'/invalid/path'</span></span><span>);
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"修改succès，原路径pour: <span class="hljs-subst">$previous</span></span></span><span>&lt;br&gt;";
} </span><span><span class="hljs-keyword">catch</span></span><span> (</span><span><span class="hljs-built_in">Exception</span></span><span> </span><span><span class="hljs-variable">$e</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Catch Exceptions: "</span></span><span> . </span><span><span class="hljs-variable">$e</span></span><span>-&gt;</span><span><span class="hljs-title function_ invoke__">getMessage</span></span><span>() . </span><span><span class="hljs-string">"&lt;br&gt;"</span></span><span>;
}

<span class="hljs-comment">/**
 * Résumer：
 * 1. set_include_pathdeValeur de retourpourAvant modification路径，échouerretourfalse。
 * 2. La fonction elle-même ne lance pas des exceptions，需要通过判断Valeur de retourouEmballer函数来进行Gestion des exceptions。
 * 3. exister生产环境milieu，Recommandé d&#39;utilisertry-catchEmballer，以便统一处理可能de错误。
 */</span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
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