is_numeric

예

변수가 숫자 또는 숫자 문자열인지 확인하십시오.

 <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">32</span> <span class="token punctuation">;</span>
<span class="token keyword">에코</span> <span class="token string double-quoted-string">"a is"</span> <span class="token operator">.</span> <span class="token function">is_numeric</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 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">에코</span> <span class="token string double-quoted-string">"B는"</span> <span class="token operator">.</span> <span class="token function">IS_NUMERIC</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 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">32.5</span> <span class="token punctuation">;</span>
<span class="token keyword">에코</span> <span class="token string double-quoted-string">"C는"</span> <span class="token operator">.</span> <span class="token function">IS_NUMERIC</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 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 is"</span> <span class="token operator">.</span> <span class="token function">IS_NUMERIC</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 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 is"</span> <span class="token operator">.</span> <span class="token function">IS_NUMERIC</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 double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>

<span class="token variable">$ f</span> <span class="token operator">=</span> <span class="token constant">null</span> <span class="token punctuation">;</span>
<span class="token keyword">Echo</span> <span class="token string double-quoted-string">"f is"</span> <span class="token operator">.</span> <span class="token function">is_numeric</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 double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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