gettype

例

異なる変数のタイプを返します。

 <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">3</span> <span class="token punctuation">;</span>
<span class="token keyword">Echo</span> <span class="token function">getType</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">3.2</span> <span class="token punctuation">;</span>
<span class="token keyword">Echo</span> <span class="token function">getType</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 string double-quoted-string">"hello"</span> <span class="token punctuation">;</span>
<span class="token keyword">Echo</span> <span class="token function">getType</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 keyword">array</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 function">getType</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 keyword">array</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"red"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"green"</span> <span class="token punctuation">、</span> <span class="token string double-quoted-string">"blue"</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span>
<span class="token keyword">Echo</span> <span class="token function">getType</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 function">getType</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 variable">$ g</span> <span class="token operator">=</span> <span class="token constant boolean">false</span> <span class="token punctuation">;</span>
<span class="token keyword">Echo</span> <span class="token function">getType</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 double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token delimiter important">？></span></span>

自分で試してみてください

例説明：

gettype()関数は、さまざまなタイプの変数（積分、フローティングポイント、文字列、配列、ヌル、およびブール）を確認し、タイプを返します。たとえば、整数変数$aの場合、 gettype($a)は文字列"integer"を返します。フローティングポイント変数$bの場合、 "double"を返し、文字列変数$cの場合、 "string"などを返します。変数が閉じたリソースである場合、PHP 7.2以降では、 gettype() "resource (closed)"を返し、以前のバージョンでは"unknown type"を返す可能性があります。