boolval
獲取變量的布爾值
中文(繁體)
中文(繁體)
返回不同變量的布爾值：
<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">echo</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">echo</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</span> <span class="token punctuation">,</span> <span class="token number">5</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 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_countable
get_debug_type
unset
intval
is_double
is_long
doubleval
is_string
