is_callable

Example

Check whether the content of a variable can be called as a function:

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">function</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 is callable: "</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 is callable: "</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>

Try it yourself