empty

Nom:empty

Catégorie:Traitement variable

Langage de programmation:php

Description en une ligne:Vérifiez si la variable est vide.

Exemple

Vérifie si une variable est vide. Vérifiez également si la variable a été définie / déclarée:

 <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 number">0</span> <span class="token punctuation">;</span>  
  
<span class="token comment">// Le résultat est vrai, car $ a est vide</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span> <span class="token keyword">vide</span> <span class="token punctuation">(</span> <span class="token variable">$ a</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">"variable &#39;a&#39; est vide. <br>"</span> <span class="token punctuation">;</span>  
<span class="token punctuation">}</span>  
  
<span class="token comment">// Le résultat est vrai car $ a est défini</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span> <span class="token keyword">isset</span> <span class="token punctuation">(</span> <span class="token variable">$ a</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">"variable &#39;a&#39; est défini"</span> <span class="token punctuation">;</span>  
<span class="token punctuation">}</span>  
<span class="token delimiter important">?></span></span>

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