is_callable
パラメーターが法的呼び出し可能な構造であるかどうかを検出します
変数のコンテンツを関数として呼び出すことができるかどうかを確認します。
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">関数</span><span class="token function-definition function">test1</span> <span class="token punctuation">(</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">"test1は呼ばれます:"</span> <span class="token operator">。</span> <span class="token function">is_callable</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"test1"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"test2は呼ばれます:"</span> <span class="token operator">。</span> <span class="token function">is_callable</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"test2"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>