Wie verwende ich IS_Numeric in PHP mit filter_var -Funktion, um die digitale Überprüfung zu verarbeiten?

gitbox 2025-06-24
<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// Hier sind einige unabhängige Code -Beispiele，Simulationsartikel Beginn des Teils</span></span><span>
</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">exampleFunction</span></span><span>(</span><span><span class="hljs-params"></span></span><span>) {
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-string">"Dieser Code hat nichts mit dem Inhalt des Artikels zu tun，Zum Beispiel nur。"</span></span><span>;
}

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-title function_ invoke__">exampleFunction</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">/**
 * Wie zu PHP Verwendet in is_numeric Zusammenarbeiten filter_var Funktionsverarbeitung Digitale Überprüfung？
 * 
 * existieren PHP In der Entwicklung，Die digitale Überprüfung der vom Benutzer eingegebenen Daten ist häufig erforderlich，Stellen Sie die Legalität der Daten sicher。
 * In，is_numeric Und filter_var Dies sind zwei häufig verwendete Funktionen，Jeder hat seine eigenen Vor- und Nachteile。
 * In diesem Artikel wird vorgestellt, wie diese beiden Funktionen für eine effektive digitale Überprüfung kombiniert werden können.。
 */</span>

<span class="hljs-comment">/**
 * 1. is_numeric Funktion Einführung
 * is_numeric Wird verwendet, um festzustellen, ob eine Variable eine numerische oder eine numerische Zeichenfolge ist（Einschließlich Ganzzahlen、Schwimmende Punktzahl、Wissenschaftliche Zählmethode）。
 * Beispiel：
 */</span>
</span><span><span class="hljs-variable">$values</span></span><span> = [</span><span><span class="hljs-string">'123'</span></span><span>, </span><span><span class="hljs-string">'12.3'</span></span><span>, </span><span><span class="hljs-string">'1e10'</span></span><span>, </span><span><span class="hljs-string">'abc'</span></span><span>, </span><span><span class="hljs-string">''</span></span><span>];

</span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$values</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$val</span></span><span>) {
    </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">is_numeric</span></span><span>(</span><span><span class="hljs-variable">$val</span></span><span>)) {
        </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"'<span class="hljs-subst">{$val}</span></span></span><span>' Es ist eine Nummer\n";
    } </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">"'<span class="hljs-subst">{$val}</span></span></span><span>' 不Es ist eine Nummer\n";
    }
}

<span class="hljs-comment">/**
 * 2. filter_var Funktion Einführung
 * filter_var Es ist eine leistungsstarke Filterfunktion，可用于验证Und过滤数据。
 * In，FILTER_VALIDATE_INT Und FILTER_VALIDATE_FLOAT 用于Überprüfen Sie die GanzzahlenUndSchwimmende Punktzahl。
 * Beispiel：
 */</span>
</span><span><span class="hljs-variable">$intVal</span></span><span> = </span><span><span class="hljs-string">'123'</span></span><span>;
</span><span><span class="hljs-variable">$floatVal</span></span><span> = </span><span><span class="hljs-string">'12.3'</span></span><span>;
</span><span><span class="hljs-variable">$invalidVal</span></span><span> = </span><span><span class="hljs-string">'12abc'</span></span><span>;

</span><span><span class="hljs-title function_ invoke__">var_dump</span></span><span>(</span><span><span class="hljs-title function_ invoke__">filter_var</span></span><span>(</span><span><span class="hljs-variable">$intVal</span></span><span>, FILTER_VALIDATE_INT));    </span><span><span class="hljs-comment">// int(123)</span></span><span>
</span><span><span class="hljs-title function_ invoke__">var_dump</span></span><span>(</span><span><span class="hljs-title function_ invoke__">filter_var</span></span><span>(</span><span><span class="hljs-variable">$floatVal</span></span><span>, FILTER_VALIDATE_FLOAT)); </span><span><span class="hljs-comment">// float(12.3)</span></span><span>
</span><span><span class="hljs-title function_ invoke__">var_dump</span></span><span>(</span><span><span class="hljs-title function_ invoke__">filter_var</span></span><span>(</span><span><span class="hljs-variable">$invalidVal</span></span><span>, FILTER_VALIDATE_INT)); </span><span><span class="hljs-comment">// bool(false)</span></span><span>

<span class="hljs-comment">/**
 * 3. Kombiniert is_numeric Und filter_var Szenarien verwenden
 * - is_numeric 能够检测是否Es ist eine Nummer或数字字符串，Breite Reichweite。
 * - filter_var Strengere Überprüfung，能区分整数UndSchwimmende Punktzahl。
 * 
 * 实际In der Entwicklung，Kann zuerst verwendet werden is_numeric Ein vorläufiges Urteil fällen，Nutze wieder benutzen filter_var Genauige Überprüfung durchführen。
 */</span>

<span class="hljs-comment">/**
 * 4. 实际Beispiel代码
 */</span>
</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">validateNumber</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$input</span></span></span><span>, </span><span><span class="hljs-variable">$type</span></span><span> = </span><span><span class="hljs-string">'any'</span></span><span>) {
    </span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-title function_ invoke__">is_numeric</span></span><span>(</span><span><span class="hljs-variable">$input</span></span><span>)) {
        </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">false</span></span><span>;
    }

    </span><span><span class="hljs-keyword">switch</span></span><span> (</span><span><span class="hljs-variable">$type</span></span><span>) {
        </span><span><span class="hljs-keyword">case</span></span><span> </span><span><span class="hljs-string">'int'</span></span><span>:
            </span><span><span class="hljs-comment">// Überprüfen Sie die Ganzzahlen</span></span><span>
            </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-title function_ invoke__">filter_var</span></span><span>(</span><span><span class="hljs-variable">$input</span></span><span>, FILTER_VALIDATE_INT) !== </span><span><span class="hljs-literal">false</span></span><span>;
        </span><span><span class="hljs-keyword">case</span></span><span> </span><span><span class="hljs-string">'float'</span></span><span>:
            </span><span><span class="hljs-comment">// 验证Schwimmende Punktzahl</span></span><span>
            </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-title function_ invoke__">filter_var</span></span><span>(</span><span><span class="hljs-variable">$input</span></span><span>, FILTER_VALIDATE_FLOAT) !== </span><span><span class="hljs-literal">false</span></span><span>;
        </span><span><span class="hljs-keyword">case</span></span><span> </span><span><span class="hljs-string">'any'</span></span><span>:
        </span><span><span class="hljs-keyword">default</span></span><span>:
            </span><span><span class="hljs-comment">// 只要Es ist eine Nummer即可</span></span><span>
            </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">true</span></span><span>;
    }
}

</span><span><span class="hljs-comment">// Testfälle</span></span><span>
</span><span><span class="hljs-variable">$testInputs</span></span><span> = [</span><span><span class="hljs-string">'123'</span></span><span>, </span><span><span class="hljs-string">'12.3'</span></span><span>, </span><span><span class="hljs-string">'1e3'</span></span><span>, </span><span><span class="hljs-string">'abc'</span></span><span>, </span><span><span class="hljs-string">'0'</span></span><span>, </span><span><span class="hljs-string">'-45'</span></span><span>, </span><span><span class="hljs-string">'3.14.15'</span></span><span>];

</span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$testInputs</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$input</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"eingeben '<span class="hljs-subst">{$input}</span></span></span><span>' Als Ganzzahl überprüfen: " . (</span><span><span class="hljs-title function_ invoke__">validateNumber</span></span><span>(</span><span><span class="hljs-variable">$input</span></span><span>, </span><span><span class="hljs-string">'int'</span></span><span>) ? </span><span><span class="hljs-string">'passieren'</span></span><span> : </span><span><span class="hljs-string">'不passieren'</span></span><span>) . </span><span><span class="hljs-string">"\n"</span></span><span>;
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"eingeben '<span class="hljs-subst">{$input}</span></span></span><span>' 验证为Schwimmende Punktzahl: " . (</span><span><span class="hljs-title function_ invoke__">validateNumber</span></span><span>(</span><span><span class="hljs-variable">$input</span></span><span>, </span><span><span class="hljs-string">'float'</span></span><span>) ? </span><span><span class="hljs-string">'passieren'</span></span><span> : </span><span><span class="hljs-string">'不passieren'</span></span><span>) . </span><span><span class="hljs-string">"\n"</span></span><span>;
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"eingeben '<span class="hljs-subst">{$input}</span></span></span><span>' Überprüfen Sie wie eine beliebige Nummer: " . (</span><span><span class="hljs-title function_ invoke__">validateNumber</span></span><span>(</span><span><span class="hljs-variable">$input</span></span><span>, </span><span><span class="hljs-string">'any'</span></span><span>) ? </span><span><span class="hljs-string">'passieren'</span></span><span> : </span><span><span class="hljs-string">'不passieren'</span></span><span>) . </span><span><span class="hljs-string">"\n"</span></span><span>;
}

<span class="hljs-comment">/**
 * 5. Zusammenfassen
 * - verwenden is_numeric Sie können schnell feststellen, ob sich eine Zeichenfolge im numerischen Format befindet。
 * - filter_var Bietet eine feiner körnige numerische Typüberprüfung。
 * - 两者Kombiniertverwenden，能提高数字验证的准确性Und灵活性。
 */</span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>
is_numeric
Ähnlich