is_resource

Name:is_resource

Kategorie:Variable Verarbeitung

Programmiersprache:php

Kurzbeschreibung:Überprüfen Sie, ob die Variable ein Ressourcentyp ist.

Beispiel

Überprüfen Sie, ob eine Variable eine Ressource ist:

 <span class="token php language-php"><span class="token delimiter important"><? Php</span>
<span class="token variable">$ file</span> <span class="token operator">=</span> <span class="token function">fopen</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"test.txt"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"r"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>

<span class="token keyword">if</span> <span class="token punctuation">(</span> <span class="token function">is_resource</span> <span class="token punctuation">(</span> <span class="token variable">$ file</span> <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">"Datei ist geöffnet"</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">"Fehler öffnen"</span> <span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token delimiter important">?></span></span>

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