boolval
変数のブール値を取得します
日本語
日本語
さまざまな変数のブール値を返します。
<span class="token php language-php"><span class="token delimiter important"><？php</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"0："</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">boolval</span> <span class="token punctuation">（</span> <span class="token number">0</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'true'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'false'</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 keyword">エコー</span><span class="token string double-quoted-string">"4："</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">boolval</span> <span class="token punctuation">（</span> <span class="token number">42</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'true'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'false'</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 keyword">echo</span> <span class="token string single-quoted-string">'""：'</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">boolval</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">""</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'true'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'false'</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 keyword">echo</span> <span class="token string single-quoted-string">'"hello"：'</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">boolval</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"hello"</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'true'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'false'</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 keyword">echo</span> <span class="token string single-quoted-string">'"0"：'</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">boolval</span> <span class="token punctuation">（</span> <span class="token string double-quoted-string">"0"</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'true'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'false'</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 keyword">エコー</span><span class="token string double-quoted-string">"[3、5]："</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">boolval</span> <span class="token punctuation">（</span> <span class="token punctuation">[</span> <span class="token number">3、5</span> <span class="token punctuation">]</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token number">'</span> <span class="token string single-quoted-string">true'</span> <span class="token punctuation">：</span> <span class="token operator">'</span> <span class="token string single-quoted-string">false'</span> <span class="token punctuation">）</span> <span class="token punctuation">。</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">"[]："</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">boolval</span> <span class="token punctuation">（</span> <span class="token punctuation">[</span> <span class="token punctuation">]</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'true'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'false'</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>
is_null
var_export
is_integer
is_bool
unset
is_numeric
is_int
isset
