array_key_exists

Name:array_key_exists

Kategorie:Array

Programmiersprache:php

Kurzbeschreibung:Überprüft, ob der angegebene Schlüsselname im Array vorhanden ist.

Beispiel

Beispiel 1

Überprüfen Sie, ob der Schlüsselname "Volvo" im Array vorhanden ist:

 <span class="token php language-php"><span class="token delimiter important"><? Php</span>
<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"volvo"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"xc90"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"bmw"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"x5"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token keyword">Wenn</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">array_key_exists</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"volvo"</span> <span class="token punctuation">,</span> <span class="token variable">$ a</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">Echo</span> <span class="token string double-quoted-string">"Der Schlüssel existiert!"</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token keyword">anders</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">Echo</span> <span class="token string double-quoted-string">"Der Schlüssel existiert nicht!"</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token delimiter important">?></span>

Probieren Sie es selbst aus

Beispiel 2

Überprüfen Sie, ob der Schlüsselname "Toyota" im Array vorhanden ist:

 <span class="token php language-php"><span class="token delimiter important"><? Php</span>
<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"volvo"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"xc90"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"bmw"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"x5"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token keyword">Wenn</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">key_exists</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"toyota"</span> <span class="token punctuation">,</span> <span class="token variable">$ a</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">Echo</span> <span class="token string double-quoted-string">"Der Schlüssel existiert!"</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token keyword">anders</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">Echo</span> <span class="token string double-quoted-string">"Der Schlüssel existiert nicht!"</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token delimiter important">?></span>

Probieren Sie es selbst aus

Beispiel 3

Überprüfen Sie, ob der Ganzzahlschlüsselname "0" im Array vorhanden ist:

 <span class="token php language-php"><span class="token delimiter important"><? Php</span>
<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"volvo"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"bmw"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token keyword">Wenn</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">array_key_exists</span> <span class="token punctuation">(</span> <span class="token number">0</span> <span class="token punctuation">,</span> <span class="token variable">$ a</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">Echo</span> <span class="token string double-quoted-string">"Der Schlüssel existiert!"</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token keyword">anders</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">Echo</span> <span class="token string double-quoted-string">"Der Schlüssel existiert nicht!"</span> <span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token delimiter important">?></span>

Probieren Sie es selbst aus

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