is_string

Name:is_string

Kategorie:Variable Verarbeitung

Programmiersprache:php

Kurzbeschreibung:Überprüft, ob die Variable einen String -Typ hat.

实例

检查变量是否为字符串类型：

 <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 string double-quoted-string">"Hallo"</span> <span class="token punctuation">;</span>  
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"a ist"</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_string</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;a String&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;keine String&#39;</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 variable">$ B</span> <span class="token operator">=</span> <span class="token number">0</span> <span class="token punctuation">;</span>  
<span class="token keyword">Echo</span> <span class="token string double-quoted-string">"B ist"</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_string</span> <span class="token punctuation">(</span> <span class="token variable">$ b</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;a String&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;keine String&#39;</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 variable">$ C</span> <span class="token operator">=</span> <span class="token number">32</span> <span class="token punctuation">;</span>  
<span class="token keyword">Echo</span> <span class="token string double-quoted-string">"C ist"</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_string</span> <span class="token punctuation">(</span> <span class="token variable">$ c</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;a String&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;keine String&#39;</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 variable">$ d</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"32"</span> <span class="token punctuation">;</span>  
<span class="token keyword">Echo</span> <span class="token string double-quoted-string">"D ist"</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_string</span> <span class="token punctuation">(</span> <span class="token variable">$ d</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;a String&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;keine String&#39;</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 variable">$ e</span> <span class="token operator">=</span> <span class="token constant boolean">true</span> <span class="token punctuation">;</span>  
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"e ist"</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_string</span> <span class="token punctuation">(</span> <span class="token variable">$ e</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;a String&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;keine String&#39;</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 variable">$ f</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"null"</span> <span class="token punctuation">;</span>  
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"f ist"</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_string</span> <span class="token punctuation">(</span> <span class="token variable">$ f</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;a String&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;keine String&#39;</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 variable">$ g</span> <span class="token operator">=</span> <span class="token string double-quoted-string">""</span> <span class="token punctuation">;</span>  
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"g ist"</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_string</span> <span class="token punctuation">(</span> <span class="token variable">$ g</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;a String&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;keine String&#39;</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 delimiter important">?></span></span>

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