unset
指定された変数を無料で解放します
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>