boolval

实例

返回不同变量的布尔值：

<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>

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