unset
指定された変数を無料で解放します
日本語
日本語
変数を破壊する：
<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">"hello world！"</span> <span class="token punctuation">;</span> <span class="token keyword">ECHO</span> <span class="token string double-quoted-string">「以前の変数 'A'： "の値を削除します</span><span class="token operator">。</span> <span class="token variable">$ a</span> <span class="token operator">。</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span> <span class="token keyword">Unset</span> <span class="token punctuation">（</span> <span class="token variable">$ a</span> <span class="token punctuation">）</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"削除後の変数 'a'の値："</span> <span class="token operator">。</span> <span class="token variable">$ a</span> <span class="token punctuation">;</span> <span class="token delimiter important">？></span></span>
is_countable
is_numeric
strval
unserialize
settype
is_array
is_long
is_iterable
