Was ist der Rückgabewert der Funktion set_include_path? Wie gehe ich mit Ausnahmen um?

<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// Dies hängt nicht mit dem Inhalt des Artikels zusammenPHPCodebeispiel</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Hier finden Sie eine irrelevante Ausgabe oben auf der Seite。"</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_pathWas ist der Rückgabewert der Funktion?？Wie man mit Ausnahmen umgeht？
 *
 * existierenPHPMitte，set_include_pathFunktionen werden verwendet, um das aktuelle Skript festzulegeninclude_path，
 * Das heißtPHPexistieren引入文件（wieincludeoderrequire）Liste der Verzeichnispfade zu suchen。
 *
 * Grundlegende Syntax：
 * set_include_path(string $new_include_path): string|false
 *
 * Rückgabewert：
 * - Wenn erfolgreich：zurückkehren**Vor der Änderunginclude_path**，Das heißt调用前von原始值。
 * - Bei Versäumnis：zurückkehren**false**。
 *
 * Beispiel：
 */</span>

</span><span><span class="hljs-variable">$originalPath</span></span><span> = </span><span><span class="hljs-title function_ invoke__">get_include_path</span></span><span>();
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Vor der Änderunginclude_path: <span class="hljs-subst">$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">$result</span></span><span> === </span><span><span class="hljs-literal">false</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"aufstelleninclude_pathscheitern！&lt;br&gt;"</span></span><span>;
} </span><span><span class="hljs-keyword">else</span></span><span> {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"aufstelleninclude_pathErfolg，Der ursprüngliche Weg ist: <span class="hljs-subst">$result</span></span></span><span>&lt;br&gt;";
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"aktuellinclude_pathfür: "</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">/**
 * Ausnahmebehandlung
 *
 * PHPvonset_include_pathDie Funktion selbst wirft keine Ausnahmen aus，它只zurückkehren布尔值。
 * daher，常见von做法是通过判断Rückgabewert来处理可能von错误。
 *
 * wie果想用异常机制，Kann manuell verpackt werden：
 */</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">"aufstelleninclude_pathscheitern，Versuchen Sie den Weg: <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">$previous</span></span><span> = </span><span><span class="hljs-title function_ invoke__">safe_set_include_path</span></span><span>(</span><span><span class="hljs-string">'/invalid/path'</span></span><span>);
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"修改Erfolg，原路径für: <span class="hljs-subst">$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">$e</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Ausnahmen fangen: "</span></span><span> . </span><span><span class="hljs-variable">$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">/**
 * Zusammenfassen：
 * 1. set_include_pathvonRückgabewertfürVor der Änderung路径，scheiternzurückkehrenfalse。
 * 2. Die Funktion selbst wirft keine Ausnahmen aus，需要通过判断RückgabewertoderPaket函数来进行Ausnahmebehandlung。
 * 3. existieren生产环境Mitte，Empfohlen zu verwendentry-catchPaket，以便统一处理可能von错误。
 */</span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>