array_rand

Name:array_rand

Kategorie:Array

Programmiersprache:php

Kurzbeschreibung:Gibt einen oder mehrere zufällige Schlüssel im Array zurück.

Beispiel

Beispiel 1

Gibt ein Array zurück, das zufällige Schlüsselnamen enthält:

 <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">"rot"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"grün"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"blau"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"gelb"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"braun"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token variable">$ random_keys</span> <span class="token operator">=</span><span class="token function"></span></span><mark> <span class="token function">array_rand</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token punctuation">,</span> <span class="token number">3</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token variable">$ a</span> <span class="token punctuation">[</span> <span class="token variable">$ random_keys</span> <span class="token punctuation">[</span> <span class="token number">0</span> <span class="token punctuation">]</span> <span class="token punctuation">]</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token variable">$ a</span> <span class="token punctuation">[</span> <span class="token variable">$ random_keys</span> <span class="token punctuation">[</span> <span class="token number">1</span> <span class="token punctuation">]</span> <span class="token punctuation">]</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token variable">$ a</span> <span class="token punctuation">[</span> <span class="token variable">$ random_keys</span> <span class="token punctuation">[</span> <span class="token number">2</span> <span class="token punctuation">]</span> <span class="token punctuation">]</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

Probieren Sie es selbst aus

Beispiel 2

Geben Sie einen zufälligen Schlüssel aus dem Array zurück:

 <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">"a"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"rot"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"b"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"grün"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"blau"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"D"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"Gelb"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">print_r</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">array_rand</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token punctuation">,</span> <span class="token number">1</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 delimiter important">?></span>

Probieren Sie es selbst aus

Beispiel 3

Gibt ein Array zurück, das zufällige Stringschlüsselnamen enthält:

 <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">"a"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"rot"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"b"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"grün"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"blau"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"D"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"Gelb"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function">print_r</span> <span class="token punctuation">(</span><span class="token function"></span></span><mark> <span class="token function">array_rand</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token punctuation">,</span> <span class="token number">2</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 delimiter important">?></span>

Probieren Sie es selbst aus

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